Coating composition

FIELD: chemistry.

SUBSTANCE: invention relates to compositions for coating base metals, to coating obtained from the said compositions, as well as to the method of obtaining the said compositions. The coating composition contains an aqueous mixture, containing particles, stable towards acids, and one or several fluoro-acids, where content of particles stable towards acids ranges from 0.005 to 8 wt % in terms of dry mass. The base metal coating contains particles, stable towards acids, attached to the base by a metal oxide matrix. Specific density of the base metal coating ranges from 5 to 50 mg/ ft2 (53.82 - 538.2 mg/m2). The method of producing the composition involves production of particles stable towards acids and one or several fluoro-acids, mixture of the said particles stable towards acids and one or several fluoro-acids in water, where pH of the coating composition ranges from 2 to 7, and content of particles stable towards acids in the coating composition ranges from 0.005 to 8 wt % in terms of dry mass.

EFFECT: invention allows for production of coating compositions, which significantly reduce the level corrosion of objects, containing several base metals.

40 cl, 3 dwg, 7 tbl, 20 ex

 

The technical field

The present invention relates to compositions for coating, in particular to compositions that can be deposited on a metal substrate to improve corrosion resistance. The invention relates to coatings formed by these compounds.

The level of technology

Before applying protective or decorative coatings on metal substrates, especially substrates containing iron, such as steel, is frequently applied coating. The coating reduces the degree of corrosion of the metal substrate when exposed to moisture and oxygen. The basis of many of the currently used compounds for coating are phosphates of metals, and the liquid used for washing includes chromium. After using phosphates of metals and chrome solutions for washing the formed waste streams that are harmful to the environment. As a result, the cost of disposal is constantly growing.

These compositions can be applied without the use of chromium leaching solutions. For example, U.S. patent 3966502 describes the subsequent treatment of phosphated metal solutions for washing containing zirconium. However, the use of such a method is suitable only for a limited number of metal substrates, it is impossible to avoid the generation of waste streams the FOSFA the metals Ltd.

In U.S. patent No. 5534082 name Dollman et al., as well as in U.S. patent No. 5281282 and 5356490 in the name of Dolan et al. described not containing chromium compositions comprising fluorinated acid, such as fortiana acid, silicon dioxide and the water-soluble polymer such as a polymer of acrylic acid and/or polymer with hydroxyl functionality. As a result of heating of silicon dioxide and fluorinated acid silicon dioxide is soluble or at least partially soluble to until the solution is clear. Therefore, particles of silicon dioxide used in these compositions for coating, are not acid resistant. the pH of these compositions is very acidic and ranges from 0 to 4, preferably from 0 to 1. Compositions for coating improves corrosion resistance of steel and galvanized steel substrates.

In U.S. patent No. 5938861 in the name of Inoue et al. described coatings on metal substrates, except aluminum. In the composition of such a cover includes an oxidizing compound such as nitric acid or hydrogen peroxide, the particles of silicate or silicon dioxide, and a metal cation, anion oximetry or the anion of formetanate Ti, Zr, CE, Sr, V, W and Mo.

In EP 1130131 A2 in the name Toshiaki et al. described not containing chromium composition for coating comprising a metal agent for surface treatment on superheroey in water, silicon dioxide and one or more of zirconium or titanium compounds, compounds of thiocarbonyl, as well as water-soluble acrylic resin. The metal agent for surface treatment selected from the attached list solenovatymi compounds normally used for applying coatings to improve adhesion between the pre-coating and decorative coating.

In U.S. patent No. 5859106 in the name of Jones et al. described not containing chromium composition for coating, which includes a cross-linked polymer system containing copolymer with acrylic and a hydroxyl functionality or the reaction product of acrylic polymer and a polymer with hydroxyl functionality. To these compositions can be added fluorinated acid, such as porcelanowa and fortiana acid. In U.S. patent No. 5905105 in the name of Jones et al. described not containing chromium composition for coating comprising the composition of the coatings described in U.S. patent 5859106, with the addition of dispersed silica and ammonium carbonate containing a metal of group IVB.

There is a need to develop formulations for coatings and methods of applying such compositions without the formation of waste solutions containing phosphates of metals and chrome. It is also preferred that these compounds effectively reduced the level of corrosion of various metallic substances, since many objects that represents the existing commercial interest include several types of metal substrates. For example, in the automotive industry often use metal components that includes more than one type of metal substrates. The use of the compositions for coatings, effective for several metal substrates contributes to the improvement of the process.

The invention

This invention relates to a composition for coating and to a method for producing such composition. Composition for coating includes an aqueous mixture containing resistant to acid particles and one or more fluorinated acids. The invention also concerns a method for obtaining these compounds.

The invention also relates to coating on a metal substrate. Such coverage includes resistant to acid particles, attached to a metal substrate using a matrix of a metal oxide. Particles are resistant to the action of acid in the acidic aqueous compositions for coating. The matrix of the metal oxide contains one or more metals selected from the group consisting of titanium, zirconium, silicon, hafnium, boron, aluminum, germanium and tin. The specific density of the surface of the metal substrate is from 5 to 50 mg/sq ft (53,82-538,2 mg/m2.

Brief description of drawings

A better understanding of the present invention contributes to its detailed description is by reference to the accompanying drawings, which

figure 1 represents the dependence of the masses and compositions of the coatings on the panels of the CRS from the time of spraying of the coating compositions for coating in accordance with the invention;

figure 2 represents the dependence of the masses of the coatings on the panels of CRS from time spray coatings of other compositions for coatings in accordance with the invention; and

figure 3 represents the following dependence of the masses of the coatings on the panels of the CRS from the time of spray coating of the regular compositions for coating in accordance with the invention.

Detailed description of the invention

Composition for coating includes an aqueous mixture containing resistant to acid particles and one or more fluorinated acids. The aqueous mixture can also contain a product of the interaction of resistant acid particles and one or more fluorinated acids. Particles are resistant to acid, if the viscosity is determined on a test sample and described herein in the section entitled "research Methodology resistant to acid particles, occurs in ten seconds or less, preferably five seconds or less. In most cases, the change in viscosity test specimens resistant to acid particles according to this invention occurs in three seconds or less. In the most preferred embodiments, treason is their viscosity, resistant to acid particles per second and less. As a rule, the shorter the period the change in the viscosity, the more resistant are the particles in an acidic, i.e. an aqueous solution with a pH from 3 to 7.

Used herein, the term "viscosity" refers to the measurement of viscosity, determined in accordance with the following procedure. As for some of the compounds according to this invention, the viscosity of their respective test samples may actually fall within 96 hours so that the defined change in viscosity is less than zero.

Alternative an ordinary specialist in the art is able to determine whether the particles are resistant to acid, by obtaining the acidified test sample containing the particles, and simple visual detection of any visible signs of thickening, precipitation or gelation for about 96 hours at room temperature.

Typically, resistant to acid particles in accordance with the invention retain a negative charge at pH from about 2 to 7. In some cases, resistant to acid particles retain a negative charge at a pH of about 3 to 6. In other cases resistant to acid particles retain a negative charge at pH from about 3.5 to 5.

One way to determine whether resistant to the slot of the particles a negative charge, is measuring the Zeta(electrokinetic)potential of the particles. This measurement can be carried out using a commercially available device, such as a Zetasizer 3000HSA from Malvern Instruments Ltd. The negative voltage means that the particles are negatively charged. Exemplary Zeta-potentials for resistant acid particles on the basis of silicon oxide used in compositions for coating are from -5 to -35 mV. Exemplary Zeta-potentials for resistant acid organic or polymeric particles used in compositions for coating are from -55 ° C to -85 mV.

Composition for coatings according to the invention also contains water. The water used for dilution of the composition for coating in accordance with the invention and provide relatively long-term stability of the composition. For example, the composition containing less than about 40 wt.%. water has a high probability of polymerization or gelation compared with the composition for the coating containing about 60 wt.%. and more water in the same storage conditions. Although compositions for coatings in accordance with the invention is typically applied to the substrate, contain about 92% or more of water, it is understood that the composition for coatings according to the invention also contains a concentrated composition with 60-92% wt. water. To echny the consumer simply dilutes the concentrated composition with additional water, getting optimum concentration of the composition for coatings with a view to its specific application.

Composition for coatings according to the invention may take the form of ready-to-use composition, the concentrated composition, prior to use with water-dilutable Supplement composition, or a two-component system for coating. When using this system fluorinated acid should be stored separately from the particles. Then before consumer use fluorinated acid and particles are mixed together.

Of course, the concentration of each of the respective components of the compositions of the coatings depends on whether the applied composition supplemented, concentrated or ready-to-use composition for coating. The optimal concentration of the components after use by the end consumer Supplement composition for coating can be restored in the appropriate tub, because the components are consumed during the coating on the substrate. Therefore complement the composition of the coatings should have a higher concentration of resistant acid particles or fluoro-substituted acids than the composition used for coating on a substrate.

The number of resistant acid particles in the composition in accordance with the invention depends on the type and consider inogo size, that is, the average diameter of the used particles. Composition for coatings must contain 0.005 to 8 wt.%, from 0,006% to 2% wt., from 0,007% to 0.5% wt. or from 0.01 to 0.2 wt.%. calculated on the dry weight of the resistant acid particles.

Resistant to acid particles of silicon dioxide can be a modified aluminum particles of silicon dioxide. These particles have a weight ratio of SiO2:Al2O3approximately from 80:1 to 240:1 and from about 120:1 to 220:1. The concentration of the modified alumina particles of silica in the compositions in accordance with the invention is 0.005 to 5 wt.%, from 0,006 up to 1% wt., from 0,007% to 0.5% wt. or from 0.01 to 0.2 wt.%. calculated on the dry weight of the resistant acid particles.

According to one of the variants resistant to acid particles used in the composition for coating, are particles of silicon dioxide, supplied in the form of colloidal suspensions Grace Davison under the trademark Ludox® TMA, Ludox® AM, Ludox® SK and Ludox® SK-G. the following specific types of particles of silicon dioxide is treated with an aluminum compound, in all probability sodium aluminate. For example, Ludox® AM is the weight ratio

SiO2:Al2O3approximately from 140:1 to 180:1. Can also be used modified aluminium silicon dioxide, such as Adelite® AT-20A, manufactured by Asahi Denka.

Ka is shown by the results of transmission electron microscopy (TEM), resistant to acid particles may have a relatively spherical shape with an average diameter of from about 2 to 80 nm, or from about 2 to 40 nm. The particles can be in the form of rods, the average length of which is approximately from 40 to 300 nm, and the average diameter of from about 5 to 20 nm. Particles can be colloidal dispersion, such as monodisperse, particles which have a relatively narrow particle size distribution. Alternative colloidal dispersion may be polydispersions, and the particles may have a relatively broad particle size distribution.

Particles of silicon dioxide usually in the form of discrete spheres suspended in the aqueous environment. This environment can also contain a polymer to improve the stability of colloidal suspensions. The polymer may represent one of the following polymers. For example, some commercially available compositions include a polymer that supports the stability of the dispersion during storage. For example, Ludox® SK and Ludox® SK-G represent two types of colloidal silica containing polymer is polyvinyl alcohol.

Means that the compositions of the coating do not require the polymer to maintain the acid stability of the compositions at pH from 2 to 7. However, in some applications it status what you coating may be added to the polymer to obtain a greater acid stability.

As confirmed by comparative compositions for coating, the use of particles of silica Ludox® AS, Ludox® HS and Ludox® TM gives the formulations for coatings, acid stability, thus, these particles are not resistant to acid particles. This does not mean that these unstable to the action of acid particles may be present in compositions for coating in accordance with the invention in relatively small quantities. Assume that the amount or concentration is unstable to acid particles that may be present in compositions for coating depends on the type of these particles, the pH of the composition, type of fluoro-substituted acid, and the type and concentration of resistant acid particles in the composition. Of course, ordinary skilled in the art will understand that one or more different types resistant to acid particles of silicon dioxide can be connected in the composition for coatings according to the invention.

According to other variant resistant to acid particles may be a modified aluminum particles of silicon dioxide. Such particles of silicon dioxide modify some ways, sometimes proprietary, which are not always known to experts in the field of methods of modification of aluminum. Not modificirowan the e aluminum particles of silicon dioxide are negatively charged, with most parts of silicic acid is neutralized, for example, sodium or ammonium. Examples of modified aluminum particles of silicon dioxide, which can be used in compositions for coating include colloidal particles from Nissan Chemical sold under the trademark Snowtex® and Snowtex n Concentration is not modified aluminum particles of silicon dioxide ranges from 0.005-5 wt.%, from 0,006 up to 1% wt., from 0,007% to 0.5% wt. or from 0.01 to 0.2 wt.%. calculated on the dry weight of the resistant acid particles.

According to other variant in compositions for coating can be used a variety of organic, polymer, resistant to acid particles. For example, polymer particles selected from the group comprising stabilized anions polymer dispersion, such as epoxy-cross-linked particles, epoxy-acrylic hybrid particles, acrylic polymer particles, polyvinylidenechloride particles and vinylacetate/vinylidenechloride/acrylic particles, provide resistant to acid compositions for coating. Three applicable commercially available type polymer particles include ACC 800 ACC 901 from Henkel Corp., and Haloflex® 202 from Avecia, Inc. ACC 901 includes epoxy-cross-linked particles. ACC 800 includes particles from polyvinylidenechloride. Haloflex® 202 includes vinylacetate/vinylidenechloride/akrilovye particles.

The concentration of the organic polymer particles in the compositions according to the invention is from 0.01 to 8 wt.%, from 0.01 to 5% wt., from 0.1 to 3% wt. calculated on dry basis.

Fluoro-substituted acid is floramite or peroxyacetic containing an element selected from the group comprising Ti, Zr, Hf, Si, Sn, Al, Ge and B. Fluorinated acid should be soluble or dispersible in water and preferably include at least one fluorine atom and at least one atom of an element selected from the group comprising Ti, Zr, Hf, Si, Sn, Al, Ge and B. Sometimes the specialists in this field of technology called fluorinated acid "formetanate".

Fluoro-substituted acids may be represented by the following General empirical formula (I):

in which each of q and r is an integer from 1 to 10;

each of R and s is an integer from 0 to 10; T is an element selected from the group comprising Ti, Zr, Hf, Si, Sn, Al, Ge and B. In the preferred fluorinated acid with the empirical formula (I) T is selected from Ti, Zr or Si; p is 1 or 2; q is 1; r is 2, 3, 4, 5, or 6; s is 0, 1 or 2.

One or more atoms N can be replaced by suitable cations such as the cations ammonium, metal, alkaline earth metal or alkali metal (for example, fluoro-substituted acid may have the ü type of salt provided this salt is soluble or dispersible in water). Examples of suitable fluorinated salts include (NH4)2SiF6, MgSiF6, Na2SiF6and Li2SiF6.

Preferred fluorinated acid used in compositions for coating in accordance with the invention, selected from the group comprising fortechnology acid (H2TiF6), forcerenew acid (H2ZrF6), ferrelview acid (H2SiF6), forborne acid (HBF4), ftorirovannogo acid (H2SnF6), forgermany acid (H2GeF6), targetnew acid (H2HfF6), peraluminous (H3lF6) acid and salts of each of them. The most preferred fluorinated acids are fortiana acid, porcelanowa acid, ferrania acid and their salts. Some of the applicable acids include salts of alkali metal and ammonium, for example Na2MF6and (Pan4)2F6where M is selected from Ti, Zr and Si.

The concentration of one or more fluorinated acids in the composition for coating in accordance with the invention can be relatively low. For example, the concentration of the fluorinated acid may be about 5 ppm (ppm). The concentration of one or more torsemide what's acids in the composition of the coating is from about 5 ppm (about 0,0005% wt.) up to 10,000 ppm (about 1.0% wt.), from about 5 ppm to 1000 ppm and 5 ppm to 400 ppm, the Preferred concentration of one or more fluorinated acids in the composition for coating in accordance with the invention is from about 3 ppm to 3000 ppm, more preferably from about 10 ppm to 400 ppm Final concentration, of course, depends on the amount of water used to obtain the composition for coatings according to the invention.

Compositions for coatings can be added catechin compounds used as a visual color indicator that on a metal substrate are really coated. Without catechin compounds obtained coating can sometimes be too thin to be visible.

The term "catechin compound" means an organic compound with the system of aromatic rings comprising at least two hydroxyl groups located on adjacent carbon atoms of the aromatic ring system.

Preferred catechin compounds employed to produce compositions for coating in accordance with the invention, have a negative or neutral charge, no charge. Negatively charged catechin compounds, as a rule, get with the lei metals, in particular in the form of salts of alkali or alkaline earth metal.

The concentration of catechin compounds in compositions for coating in accordance with the invention can be optimized by experts in the field of technology to produce visible coating. The concentration of catechin compounds depends on the type of catechin compounds. It is also expected that each catechin compound different interacts with each kind of resistant to acid particles used in the composition for coating. In the result, the optimal concentration of catechin compounds depends on the type (species) resistant to acid particles used in compositions for coating. And finally, since any excessive amount of catechin compounds can be removed at the stage of rinsing after application of the composition for coating on a metal substrate, the concentration of catechin compounds may be higher than the concentration required to obtain the brightly colored cover.

According to one variant of the catechin compound selected from alizarin series of compounds. For example, alizarin, alizarin red, alizarin orange, and salts of each of them can be used to produce compositions for coating in accordance with the invention. One of the preferred Ali is arenovich compounds is the alizarin red, that is, 3,4-dihydroxy-9,10-dioxo-2-anthracenesulfonic acid and its salts.

According to another variant of the catechin compound selected from pyrocatechin and paired pyrocatechin. The term "conjugated pyrocatechin" means pyrocatechin with the conjugated ring system. Sulfophthalic of pyrocatechin, i.e. pyrocatechin purple, is one of the preferred conjugate pyrocatechin. Composition for coating in accordance with the invention may also include one or more polymers. One or more polymers preferably contain functional groups selected from hydroxyl, carboxyl, complex, ester, amide, or combinations thereof. It is assumed that the functional groups of the polymers have different functions. First, before formation of the coating functional groups provide a relatively high water-solubility or Miscibility with water of the polymer. Secondly, functional groups provide points along the main chain of the polymer, through which may occur cross-linking of polymers, as a composition for coating hardens, forming a coating on a metal substrate. Thirdly, it is assumed that the functional groups on the polymer to enhance the adhesion between the metal substrate and the particles in the hardened coating is.

An illustrative example of one or more applicable polymers may be selected from polyvinyl alcohol, a complex of the polyester, water-soluble derivatives of complex polyester, polyvinylpyrrolidone, copolymer of polyvinylpyrrolidone-vinylcaprolactam, copolymer of vinylpyrrolidone-vinylimidazole and copolymer of sulfonated polystyrene-maleic anhydride. The most applicable preferred polymers include polyvinyl alcohol and a copolymer of polyvinylpyrrolidone-vinylcaprolactam. Luvitec® and Elvanol® are two commercially available types of polymers that can be used to obtain a composition for coating in accordance with the invention. Luvitec® is a polymer of vinylpyrrolidone-vinylcaprolactam manufactured by BASF. Elvanol® is a polymer of polyvinyl alcohol, manufactured by Dupont.

In the presence of one or more of the above polymers fluorinated acid capable of acting as a curing agent, and also as a binding agent. It is assumed that the fluorinated acid reacts with the functional groups of the polymer and thus provides the possibility of cross-linkage. Cross-linking of the polymer in combination with a fluorinated acid provides reception zamenopoulos matrix of p is limera - metal oxide linking particles to produce coatings on a metal substrate.

Composition for coating in accordance with the invention, the receiving method including obtaining resistant to acid particles and one or more fluorinated acids and mixing resistant to acid particles and one or more fluorinated acids in water. Content-resistant acid particles in the composition for coating is 0.005 to 8 wt.%. in the calculation of dry weight. Obtaining a composition for coating may also include one or more of the polymers mentioned in the list above, and mixing the polymer with other components.

The pH of the composition for coating in accordance with the invention varies from about 2 to 7, preferably about 3 to 6, more preferably from about 3.5 to 5. The pH of the composition for coating can be adjusted by means of mineral acids, such as hydrofluoric acid, phosphoric acid and the like, including mixtures thereof. An alternative can be used for more number of fluoro-substituted acid. Can also be used organic acids such as lactic acid, acetic acid, citric acid, sulfamic acid, or a mixture thereof.

The pH of the composition for coatings also can the t to be adjusted by adding small amounts of alkali compounds, as a rule, in the form of a metal or ammonium hydroxide, carbonate or bicarbonate. Examples of inorganic and organic bases include sodium hydroxide, ammonium hydroxide, ammonia or amines, for example triethanolamine or other alkylamines followed.

Compositions for coatings can also include one or more secondary agents selected from the equalizing agent, moisturizing agent, antifoaming additives and adhesives. However, an ordinary person skilled in the art will understand that the use of such agents, and their number must be compatible with the pH of the composition for coating. Adding too many secondary agent is able to significantly reduce the resistance of the composition to the acid.

Composition for coatings according to the invention can be deposited on a metal substrate, forming a corrosion resistant coating. The metal substrate can be passivated (corrosion resistance can be improved) compositions for coating in accordance with the invention include cold rolled steel, hot rolled steel, stainless steel, steel coated with metallic zinc, zinc alloys, such as zinc plated steel, steel, covered with alumiinum or linkageless coated, steel, galvanized hot pogruzheny is, aluminum alloys, and clad aluminum steel substrate. This invention also has the advantage that components containing more than one type of the metal substrate can be passivated in one process because of the wide range of metal substrates, which can be passivated composition for coating in accordance with the invention.

Although this is not required, the metal substrate is typically cleaned, removing oil, dirt or other foreign deposits, using known methods and materials for cleaning, such as weak or strong alkaline cleaners. Examples of alkaline cleaners include Parco® Cleaner ZX-1 and Parco® Cleaner 315, manufactured by Henkel Surface Technologies. Then, the metal substrate is washed with water or aqueous acid solution. Before contact with the metal substrate with a composition for coating in accordance with the invention, the metal substrate can also be processed commercially available solution of metal phosphate, for example solutions of iron phosphate or zinc.

Composition for coatings according to the invention is applied on the metal substrate by any method known in the art. Two of the most preferred methods are spraying and immersion. The thickness and costavoidance a metal substrate, the coating is dependent on a number of factors, including particle size, concentration of particles and the time of exposure or contact with the composition for coating application.

Figure 1 illustrates how the composition of the dried coating on the panel of the CRS obtained from the composition for the coating of example 1 can be changed during spraying. As follows from figure 1, the concentration of silicon dioxide (weight of silicon and oxygen) in the coating is relatively independent of the time of spraying, the quantity of silicon dioxide at a relatively constant at a density of approximately from 10 to 17 mg/sq ft (107,64-182/99 mg/m2) over time spray from approximately 25 to 100 seconds. This can be expected when the proposed monolayer covering structure.

2 and 3 show the differences in the thickness of the coating over time spraying from about 25 to 125 seconds for the selected compositions for coatings in accordance with the invention.

Conversely, it is obvious that the amount of titanium and zirconium in the coating over time increases linearly. The amount of metal in the coating is from 0.5 to 6 mg/sq ft (5,38-64,52 mg/m2). In many cases, the amount of metal in the coating is from 0.5 to 3 mg/sq ft (5,38-32,29 mg/m2).

The coatings produced from the compositions according to the invention have a relatively small weight compared to the currently used technology grease the coatings. Coatings in accordance with the invention have a density of from 5 to 50 mg/sq ft (53,82-538,2 mg/m2). However, in many cases, the density of the coating is from 8 to 30 mg/sq ft (86,11-322/92 mg/m2). In fact, usually from compositions for coatings receive a coating weight of from 8 to 20 mg/sq ft (86,11-215,28 mg/m2).

After treatment of the metal substrate composition for coating the composition may be dried in place, i.e. on the surface of the metal substrate. Alternative applied composition for coating may be washed, preferably with water, to remove its excess, and then dried. Drying may be effected at any temperature. Typically, a suitable temperature is from 100 to 300°F (37,78-148,89°C). The selected drying conditions depend on consumer preferences, availability of space and the type of the applied finish coating. For example, powder coating usually requires before applying a dry surface in comparison with the coating is water-based.

Coverage includes resistant to acid particles, attached to a metal substrate using a matrix of a metal oxide. As for the hardened coating on the metal substrate, the term "resistant to acid particle to describe particles in the coating means particles that provide the described here resistant to the acid with the composition of coatings. The matrix of the metal oxide includes one or more metals selected from the group comprising titanium, zirconium, silicon, hafnium, boron, aluminum, germanium and tin. The matrix of the metal oxide preferably includes one or more metals selected from titanium, zirconium and silicon. If the composition of the coating is water-soluble polymer, the matrix of the metal oxide may further comprise a product of the interaction of one or more polymers and one or more fluorinated acids or salts of each of them. The coating in accordance with the invention can be described as a coating in the form of brick and mortar, and the particles are bricks, and the matrix of the metal oxide is solution.

One of the advantages of the coatings in accordance with the invention is that they provide comparable and in most cases superior corrosion resistance compared to current technology coating of iron phosphate. This improvement in corrosion resistance is achieved by coating the substantially smaller than the coating of iron phosphate. For example, to provide an acceptable degree of corrosion resistance pane of the CRS, the specific density of the coating of iron phosphate is from about 50 to 150 mg/sq ft (538,2-164,59 mg/m 2). The coating in accordance with the invention can provide the same degree of corrosion resistance when the specific gravity of the coating comprising from 8 to 30 mg/sq ft (86,11-322,92 mg/m2). In most cases, the coating in accordance with the invention has an acceptable degree of corrosion resistance when the specific gravity of the coating comprising from 8 to 20 mg/sq ft (86,11-215,28 mg/m2).

Another advantage of the coating according to the invention before the coating of iron phosphate is their relatively high flexibility and durability. In testing the impact strength and the bending tests of the coating in accordance with the invention is generally retain their corrosion resistance in contrast to the coating of iron phosphate. Moreover, these tests were subjected to coating in accordance with the invention, when the specific gravity of the coating is less than 20 mg/sq ft (215,28 mg/m2), while the density of the coating of iron phosphate is about 65 mg/sq ft (699,65 mg/m2).

Can then be applied to additional coverage. In most cases, these coatings are priming compositions of paint or finish coating of paint, such as completing the floor. One of the many advantages of coatings in accordance with the invention is that the above procurement is of itia compatible with any number of protective paints, such as Duracron® 200, which is a solid acrylic paint from PPG Industries, as well as powder coatings, such as Sunburst® Yellow, which is a polyester powder paint from Morton International. Coatings in accordance with the invention is also compatible with the paint, applied by electrodeposition.

The invention and its advantages will become clearer with reference to the following examples. The examples are intended to illustrate specific options in the total amount of the claimed invention and should not be construed as in any way limiting it.

1. Research-resistant acid particles

Of sodium acetate/acetic acid to prepare a buffer with a pH of about 5.0, podkisst solution of hydrochloric acid. To 20 ml buffer add 20 ml of the dispersion of the selected particles. As a sample for testing the dispersion of the particles should have a silicon dioxide content of about 30% wt. If the content of silicon dioxide above, the dispersion is diluted to 30% wt. Mix the solution for ten minutes. Mark, is there a solution liquid, that is, whether there are any visible signs of thickening, precipitation or gelation for about 96 hours at room temperature.

The experimental method used for qualitative determination of resistant acid h is stitz, includes determining the change in viscosity of the sample for testing more than 84 hours at room temperature. The viscosity is determined by applying the device Zahn Cup from Gardner Laboratory Division, Pacific Scientific Co.

The Zahn Cup to determine the viscosity is a small U-shaped Cup, supported by the wire. At the bottom of the Cup has a hole, which may have different sizes. For example, the Zahn Cup #2 used in the test for determination of acid resistance, approved ASTM D4212 with a hole diameter 2,69 mm, the viscosity of the sample is determined, fully immersing the Cup in the sample for testing. The time in seconds from the moment when the top of the Cup appears from the sample, until, when part of the stream falling from the hole, does not break free, is a measure of the viscosity of the sample.

After the above-described procedure for determining the resistance to acid to prepare a buffer of sodium acetate/acetic acid with a pH of about 5.0. To 20 ml buffer add 20 ml of the dispersion of the selected particles. The dispersion of the particles should have a silicon dioxide content of about 30% wt. If the content of silicon dioxide above, the dispersion is diluted to 30% wt. Mix the solution for ten minutes. At about this time, perform the new viscosity measurement.

The design will then give you the opportunity to settle closer is nio at room temperature before making the next measurement of viscosity. As follows from table 1, there is little or no evidence of any change in the viscosity of the samples obtained from particles of examples 1-10 within 96 hours. For comparison, the samples of comparative examples 1-4 after 96 hours there is thickening or gelation. Due to the fact that these samples after 96 hours was subjected to gelation, the last time the viscosity was determined through 84 hours; the results are presented in table 2.

2. Getting metal substrates

Panels of cold rolled steel and zinc plated steel used to determine the corrosion resistance of the cured coatings are pre-processed as follows. The panel is treated with a cleaner Parco Cleaner 1523, which represents an alkaline cleaner from Henkel Surface Technologies. Cleaner (about 2% in water) is sprayed on the panel at 120°F for 2 minutes. The cleaned panel is washed by spraying warm water from the tap for 30 seconds. Composition for coating according to the invention is sprayed on the washed panel for 30 seconds at ambient temperature. Alternative panel is immersed in the composition for coating. Then the panel with the floor if necessary, wash, spraying cold water for 30 seconds. Typically, after application of the composition for coatings with relatively high is Kim particle content carry out the washing with water to remove residual unbound) particles with panels. Washing with water is usually not required when using the compositions for coating with a relatively low particle content. Then the panel is dried at a temperature of 300°F (148,89°C) for 5 minutes. The weight of the coating in accordance with the invention is determined by measuring the metal content, for example of silicon, titanium and zirconium, with the help of x-ray fluorescence panels coated with the coating. Coating weight of silicon dioxide may also be determined using the following procedure: weigh-in - coating - weigh - remove cover - weighing, the coating in accordance with the invention removes 45% potassium hydroxide at 170°F.

Table 1
ExampleResistant to acid particleViscosity (fresh)Viscosity (96 h)The change in viscosity, Δ
1Ludox TMA14151
2Ludox AM14140
Ludox SK14140
4Ludox SK-G14140
5Snowtex14151
6Snowtex O14140
7Snowtex N14151
8ACC 80014140
9Haloflex 20215150
10ACC 90115150

3. The application of the final coating on the substrate with a coating

On the panel with applied and expose the th drying the coating applied Duracron 200, polyacrylic enamel coating, manufactured for industrial purposes PPG Industries, Inc. or Sunburst Yellow, epoxy-polyester hybrid powder produced for industrial purposes Morton International. The paint on the panels allow to harden in accordance with the manufacturer's recommendations.

4. Tests on the corrosiveness

To determine the corrosion resistance of the panels scribit, and scribonianus panel sprayed saline (5% NaCl) for 500 or 750 hours (method ASTM B-117). Corrosion of panels with coatings determined by measuring the creep after scribing. The data in table 3 represent the distance in mm extended scribing after corrosion in the spray solution on the panel of the CRS. As a result, the smaller the number, the more effective corrosion resistance of the coating.

Example 1

Fortechnology acid (0.4 g, 60%) and forcerenew acid (0.4 g, 20%) are added to the mix distilled water (3989,2 g). While stirring the obtained mixture is added 10 g of Ludox® TMA (33% of silicon dioxide). The pH of the mixture was adjusted to approximately 4 by adding ammonium carbonate and/or a small number of additional fortechnology acid. The mixture is stirred for approximately two hours.

Examples 2-10

In examples 2-10 compositions for use n the bearing surfaces, obtained in accordance with the procedure described in example 1, except for the type and the amount used is resistant to the acid particles. The type and percentage by weight of particles of examples 1-10 are shown in table 4. The percentage by weight fortechnology acid and porcelaneous acid used in examples 2-10, is about 0.01%.

Table 3
FloorCreep scribing (mm)aCreep scribing (mm)bDensity of coating mg/square foot (mg/m2)
Bonderite 1090 with an insulating layer of PLN 99A4,24,260 (645,83)
Example 13,64,215 (161,46)
Example 102,22,916 (172,22)
andThe salt spray for 500 hours, the paint - Duracron 200.
bThe spray of salt within 750 h, paint - Sunbrst Yellow.

Bonderite B-1090 and PLN 99A represent the rinse solution of phosphate from Henkel Corp.

Examples 11-16

In examples 11-16 using the compositions for coating obtained in accordance with the procedure described in example 1, except the number of resistant acid particles, titanium and zirconium. The percentage by weight of particles, titanium and zirconium of examples 11-16 are shown in table 5. Titanium and zirconium have views fortechnology acid and porcelaneous acid. The content of titanium, zirconium and silicon dioxide determined using spectroscopy with inductively coupled plasma (ICP).

Examples 17-20

In examples 17-20 using the compositions for coatings obtained in accordance with the procedure described in example 1, except for the amount used is resistant to the acid particles and the content of zirconium. The percentage by weight of particles and zirconium of examples 17-20 are listed in table 6.

Comparative examples 1-6

In comparative examples 1-3 described compositions for coating containing particles of silicon dioxide type Ludox®. In comparative examples 4 and 5 described compositions for coating containing particles of silicon dioxide type Snowtex®. In comparative example 6 described the compositions for coating, containing particles of silicon dioxide type Cabospere®.

In comparative examples 1-6 using the compositions for coatings obtained in accordance with the procedure described in example 1, except for the type of particles of silicon dioxide. The percentage by weight fortechnology acid and porcelaneous acid is about 0.01%. In comparative examples 1-6 resistant to acid particles were not used, and attempts coatings of these compositions on the panel failed. The test results obtained in comparative examples 1-6, shown with corresponding data on coatings in table 7.

Table 6
Creep scribing (mm)
ExampleSilicon dioxide, %Zr %CRS/ Duracron 200, 500 h in NSSCRS/ Duracron 200, 20 cycles of GM9540PCRS/Sunburst Yellow, 750 h NSSCRS/Sunburst Yellow, 40 cycles GP9540PDensity of coating g/by (mg/m2)
In-1090/ PLN99ANo. No.a 3.93,27,6757 (613,54)
170,00590,0044,22,87,17,128,4 (305,70)
180,0130,0083,22,66,96,924,3 (261,56)
190,0130,0093,42,77,37,333,3 (358,44)
200,0160,0113,22,76,76,727,1 (291,70)

Table 7
No. EUR. note the p Type and % wt. particlesTest the resistance of the pass. acidThe surface modification ofParticle size (nm)
10,25% Ludox® AS-30NoNo12
20,25% Ludox® HSNoNo12
30,25% Ludox® TMNoNo20
4Snowtex 40NoNo15
5Snowtex 50NoNo25
6Cabosperse A-205NoNo150

1. Composition for coating on metallicheskie substrate, comprising an aqueous mixture containing resistant to acid particles and one or more fluorinated acids, the content of resistant acid particles is 0.005 to 8 wt.% calculated on dry basis.

2. The composition according to claim 1, which is resistant to acid particles are modified with aluminum particles of silicon dioxide, the content of resistant acid particles in the composition for coating is 0.005 to 5 wt.% calculated on dry basis.

3. The composition according to claim 1, which is resistant to acid particles are not modified aluminum particles of silicon dioxide, the content of resistant acid particles in the composition for coating is 0.005 to 5 wt.% calculated on dry basis.

4. The composition according to claim 1, which is resistant to acid particles are polymeric organic particles.

5. The composition according to claim 1, in which the mixture includes the product of the interaction of resistant acid particles and one or more fluorinated acids.

6. The composition according to claim 2, in which the modified alumina particles constitute from about 0,006 up to 1 wt.% calculated on dry basis.

7. The composition according to claim 2, in which the modified alumina particles have a weight ratio of SiO2:Al2O3from 80:1 to 240:1.

8. The composition according to claim 2, in which the modified aluminum particles to them who are the weight ratio of SiO 2: Al2About3from 120:1 to 220:1.

9. The composition according to claim 3, in which the modified alumina particles constitute from about 0,006 up to 1 wt.% calculated on dry basis.

10. The composition according to claim 1, which is resistant to acid particles change viscosity in ten seconds or less.

11. The composition according to claim 1, having a pH of from 3 to 6.

12. The composition according to claim 1, having a pH of from 3.5 to 5.

13. The composition according to claim 1, which is resistant to acid particles change viscosity in three seconds or less.

14. The composition according to claim 1, in which the content is resistant to acid particles is from 0,006 up to 2 wt.% calculated on dry basis.

15. The composition according to claim 1, in which the content is resistant to acid particles is to 0.007 to 0.5 wt.% calculated on dry basis.

16. The composition according to claim 1, in which the content of one or more fluorinated acids of approximately from 5 to 1000 ppm

17. The composition according to claim 1, which is resistant to acid particles alter the viscosity of one second or less.

18. The coating on the metal substrate, comprising resistant to acid particles, attached to a metal substrate by means of a matrix of a metal oxide, the relative density of the surface of the metal substrate is from 5 to 50 mg/sq ft (53,82-538,2 mg/m2).

19. Coverage p, in which the matrix of the metal oxide includes one or more elements selected from the group vkluchaya is titanium, zirconium and silicon.

20. Coverage p, which is resistant to acid particles selected from one or more groups, including the modified aluminum particles that are not modified by aluminum particles and organic polymer particles.

21. Coverage p, in which the density of coating a metal substrate is from 8 to 30 mg/sq ft (86,11-322,92 mg/m2).

22. Coverage p, which is resistant to acid particles are present in an amount of 5 to 25 mg/sq ft (53,82-269,10 mg/m2)

23. Coverage p, in which the metal is present in an amount of from 0.5 to 6 mg/sq ft (5,38-64,58 mg/m2).

24. Coverage p, which is resistant to acid particles are present in an amount of from 10 to 20 mg/sq ft (107,64-215,28 mg/m2).

25. Coverage p, having a thickness, comprising from 75 to 125% of the average diameter of resistant acid particles.

26. A method of obtaining a composition for application to a metal substrate, including
getting resistant to acid particles and one or more fluorinated acids and
mixing resistant to acid particles and one or more fluorinated acids in water, while the pH of the composition for coating is from 2 to 7, and the content of resistant acid particles in the composition for coating is 0.005 to 8 wt.% calculated on dry basis.

27. The method according to p, which is resistant to acid is those particles selected from one or more groups, including the modified aluminum particles that are not modified by aluminum particles and organic polymer particles.

28. The method according to item 27, in which the content of modified aluminum particles in the composition for coating is approximately 0,006 up to 1 wt.% calculated on dry basis.

29. The method according to item 27, in which the content is not modified aluminum-resistant acid particles in the composition for coating is approximately 0,006 up to 1 wt.% calculated on dry basis.

30. The method according to item 27, in which the content of organic particles in the composition for coatings comprise from about 0.01 to 5 wt.% calculated on dry basis.

31. The method according to p, in which the pH of the composition for coating is 3 to 6.

32. The method according to p, in which the pH of the composition for coating ranges from 3.5 to 5.

33. The method according to p, in which the number of resistant acid particles in the composition for coating is approximately 0,006 up to 2 wt.% calculated on dry basis.

34. The method according to p, in which the content of one or more fluorinated acids in the composition of the coating is from about 5 to 1000 ppm

35. The method according to p, which is resistant to acid particles change viscosity in three seconds or less.

36. Composition for coating metal substrates containing from 0,006 up to 2 wt.%, per dry weight, resistant to acid particles is one or more fluorinated acids, having a pH of approximately 3 to 6, the composition of the coating in the liquid state provides specific density of the coating on the metal substrate from 8 to 30 mg/sq ft (86,11-322,92 mg/m2).

37. The composition p, which is resistant to acid particles selected from the group including the modified aluminum particles that are not modified by aluminum particles and organic polymer particles.

38. The composition b, in which the content is resistant to acid particles is approximately to 0.007 to 0.5 wt.% calculated on dry basis.

39. The composition b, in which the content of one or more fluorinated acids of approximately from 5 to 1000 ppm

40. The composition p, which is resistant to acid particles change viscosity in three seconds or less.



 

Same patents:

FIELD: welding jobs.

SUBSTANCE: invention can be used in soldering silumin coated aluminium and aluminium alloys at high temperatures. The proposed method comprises the steps that follow. First the surface to be soldered is degreased and/or degreased and etched. Then the said surface is subjected to treatment by water solution of fluorohydrogen acid mixed with alkaline metal fluorides, the concentration of components in the solution making, in percent by weight, the following values, i.e. fluorohydrogen acid - 1.0 to 35.0, alkaline metal fluoride - 0.2 to 22.0, water - the balance. Now the surface is dried and soldered in inert gas atmosphere with no fluxes, irrespective of curing time after treatment.

EFFECT: layer of aluminates produced on soldered surface boats practically equal thickness and provides for high quality of soldering.

4 cl, 1 tbl, 8 ex

FIELD: technological processes.

SUBSTANCE: invention may be used in radio engineering industry, instrument making, aircraft industry for preparation of pore-free thick coatings on parts made of aluminium and its alloys. Method includes preparation of their surface for coating, immersion into solution with the following composition, g/l: orthophosphoric acid 40-50, chrome anhydride 5-7, hydrofluoric sodium 3-4, at temperature of 20-30°C, soaking in solution for 4-7 min, flushing in clod running water and drying, at that parts that are immersed into solution are exposed to wideband accidental vibration in the range of 10-1000 Hz and mean-square acceleration of 18-22 m/sec2.

EFFECT: development of method for application of conversion coating on parts made of aluminium.

3 ex

FIELD: chemistry.

SUBSTANCE: method of conditioning of surface of aluminium and its alloys for soldering which includes treatment of the surface with degreasing and etching solutions followed by treatment in water solution of hydrofluoric acid mixed with fluoride of an alkaline metal with the following concentration of ingredients in solution, % w/w: hydrofluoric acid - 1-27, fluoride of an alkaline metal - 1-50, water - the rest of solution.

EFFECT: high quality of aluminium and its alloys soldering is ensured.

3 cl, 4 tbl

FIELD: process for coating of parts made from aluminum of alloys thereof.

SUBSTANCE: method involves preparing part surface for coating process; dipping part into solution of composition including, g/l: orthophophoric acid 40-50, chromic anhydride 5-7, hydrofluoric sodium 3-4, at temperature of 20-30 C; holding in solution during 4-7 min; washing with cold running water and drying. Parts dipped into solution are subjected to harmonic vibrations with fixed frequency ranging between 300 Hz and 600 Hz and mean-square acceleration of 9-11 m/s.

EFFECT: provision for producing of thick corrosion-resistant coating on parts made from aluminum and alloys thereof.

3 ex

FIELD: mechanical engineering; production of foil from beryllium.

SUBSTANCE: proposed method consists in placing the beryllium blank into metal casing, sealing-up, rolling at temperature of 600-800°C and removal of casing. Prior to placing the blank into casing, it is placed into solution for passivation and is heated in air at temperature of 550-600°C during period sufficient for forming modified passive film up to 10 mcm in thickness; passivation solution contains the following components, g/l: potassium bichromate, 150-200; hydrofluoric acid, 9.5-9.8; sodium fluoride, 5-10; beryllium, 0.2-0.4; water, up to 1 l. Proposed method excludes fusion of beryllium blank with metal of casing in rolling and contamination of beryllium with alloying elements of metal of casing.

EFFECT: enhanced mechanical properties of foil; increased vacuum density at retained radiation transparence.

3 cl, 3 tbl, 1 ex

FIELD: coating of metal articles, in particular corrosion-resistant chemical conversion coatings.

SUBSTANCE: coating of structural alloys, preferably aluminum and aluminum-based alloys is carried out by treatment in acid aqueous solution containing water soluble chromium(III) compounds, fluoride, and corrosion strength improving additive (preferably nitrotris(methylene)triphosphonic acid. Claimed method includes treatment of metal substrate with said solution free from hexavalent chromium. Article contains metal substrate, coated as described above. Article may also contain anodized aluminum substrate with sealed coat comprising trivalent chromium and phosphorus applied on anodized coat.

EFFECT: trivalent chromium-based chemical conversion coating free from hexavalent chromium; effective stable coating solution.

23 cl, 8 dwg, 2 tbl, 1 ex

The invention relates to chemical treatment of metal, in particular, compositions intended for the treatment of products with complex configuration

FIELD: chemistry.

SUBSTANCE: epoxy composition is intended for obtaining anti-corrosion coatings on products and reservoirs from concrete, reinforced concrete, metallic constructions. Composition includes following components, with their ratio, wt %: 47.4-54.4 of epoxy-diane resin ED-20, 2.8-4.3 of modifier, 19.6-27.0 of solvent, 21.7-22.8 of amine hardener. As modifier composition contains polyisocyanate based on 4,4'-diphenylmethandiisocyanate. As solvent composition contains solvent R-4. As hardener composition contains aromatic polyamine "Aramine".

EFFECT: increase of water-resistance and resistance of composition to impact of acids and alkalis.

2 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: anticorrosive composition for primer coat contains finely dispersed powder of zinc, polystyrene and/or styrene copolymer with rubber used as a binding agent, aromatic solver and 4,4'-diphenylmethanediisocyanate additionally. The method of anticorrosive treatment is carried out by applying over preliminary treated surface at least one primer coat prepared from the mentioned above composition with further applying at least one finishing coat.

EFFECT: preparation of one-package anticorrosive composition, flowability and plasticity of which is unchanged in water presence, providing high anticorrosive and chemical stability of treated surface designed for using articles in the conditions of continuous contact with water medium and atmosphere, having of higher mechanical and adhesive properties and providing with decreased material consumption during coat formation.

3 cl, 5 tbl, 5 ex

FIELD: metallurgy.

SUBSTANCE: method consists in applying coating on polymer composition onto metal surface, where polymer composition is made on base of reactive resins, and in successive solidifying; in addition, there is used polymer composition containing micro-capsules with corrosion inhibitor preliminary introduced in micro-capsules from inert sorbent and/or inert sorbent with polymer shell of 1-100 mcm size. The micro-capsule with corrosion inhibitor used for protection of metal surfaces is made out of inert sorbent with polymer shell into pores of which corrosion inhibitor is impregnated and/or the capsule is covered with polymer shell produced by means of sedimentation of film forming substance from solution.

EFFECT: method facilitates upgrading degree of anticorrosion protection of coated metal surface due to continuous dozed release of inhibitor during operation of coating and due to constancy of inhibitor properties in coating; also method increases adhesion and strength of coating, reduces inhibitor consumption and localises selectivity of its effect.

9 cl, 2 dwg, 1 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: anticorrosive coating compound with high content of non-volatile components containing a major component (A) containing epoxy resin (a1) and polymerised monomer (a3) (meth)acrylate, and curing component (B) containing alicyclic amine hardener (b1) and/or Mannich base-type hardener (b2); component (A) and/or component (B) contains at least either an additive (a2) chosen from epoxidated reactive diluents and modified epoxy resins, and a modifier (ab) of coating film chosen from petroleum polymer resins, xylene resins, coumarone resins, terpene-phenolic resins and vinyl chloride copolymers. Anticorrosive coating compound with high content of non-volatile components, particularly quick-set compound is characterised by content of organic solvents with boiling temperature 150°C and higher. Essentially it does not contain organic solvents with boiling temperature 150°C or lower.

EFFECT: compound is used to coat all time of the year regardless of temperatures due to quick drying and sufficient viability and has good low-temperature curability.

59 cl, 9 tbl

FIELD: chemistry.

SUBSTANCE: acrylic paint system as a acrylic filming agent contains methylmethacrylate copolymer and H-butylmethacrylate resin Degalan LP64/12, and alkyd urethane varnish, dibutylphthalate or chloroparaffine CP-470 as a plasticising agent, pigments, calcite filler, toluene and butylacetate as an organic solvent, organic derivative of montmorillonite Bentone SD-2 as a thickening agent, mixed natural phospholipids Soya lecithin as a dispersant. The system additionally contain antirust pigment Phosmet that is mixed hydrated aluminium and calcium phosphates, or Polyphosmet that is aluminium and calcium polyphosphates compounds, talc as a filling agent, siccative and surface-active substance polymethylsiloxane liquid in the declared ratio.

EFFECT: acrylic system is characterised with high spreading capacity of dry film and static resistance.

2 tbl, 11 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to method of plating on metallic surface by water composition, containing a) no less than one hydrolysing and/or at least partially hydrolysed silane free from fluorine , b) no less than one hydrolysed and/or at least partially hydrolysed silane consisting fluorine, and c) at least one chelate compound of metal and/or d) at least one organic film-forming material, corresponding oligomer, polymer and/or copolymer, herewith relation of organic film-forming material d) to silanes a) and b) in concentrate or in bath is in limits from 0.1:1 up to 10:1, and silanes in composition are soluble in water or become soluble in water in the issue of hydrolysis and/or chemical change, herewith water composition can contain organic solvent and practically full or fully free from compositions of hexavalent chromium.

EFFECT: receiving of ability of plating on metallic surface at high rates from solution practically fully or fully free from compositions of hexavalent chromium.

27 cl, 3 tbl

FIELD: chemistry.

SUBSTANCE: invention concerns composite material for surface coating for units and parts of aggregates, machines, devices requiring corrosion protection and operating for long time in high-temperature (up to 500°C) flow of natural gas combustion products, represented mainly by water and carbon dioxide (CO2), e.g. for gas turbine elements. Composite material includes the following components at indicated ratio, in wt %: 53.6-68.4 of aluminium powder filler and 46.4-31.6 of binder. Liquid glass with 1.40-1.45 g/cm3 density and 2.85-3.05 modulus or its aqueous solution with 1.12-1.18 g/cm3 density and 2.85-3.05 modulus is used as binder.

EFFECT: enhanced corrosion and adhesion resistance of coating operated in conditions of cyclic high-temperature load up to 500°C.

5 tbl, 4 ex, 1 dwg

FIELD: metallurgy.

SUBSTANCE: inventions relate to versions of receiving method of protective coating on products made of low-alloyed and carbon steel, continuous operating in high-temperature up to 500°C flow of combustion materials of natural gas, corresponding substantially water and carbonic acid (CO2), for instance gas turbine components. The first version of the method consisting in on product surface it is applied at least one layer of composite material and implemented it's drying. Composite material is received by blending of binding sodium or potassium liquid glass with density 1.42-1.44 g/cm3 and modulus 2.85-3.05 with water up to receiving of solution with density 1.12-1.18 g/cm3, and introduction of dry filler of aluminium powder in correlation to solution amount - 1.2-2.1. The second version of the method consisting in on product surface it is applied at least one layer of composite material, received by blending of sodium or potassium liquid glass with density 1.42-1.44 g/cm3 and modulus - 2.85-3.05 with water up to receiving of solution with density 1.12-1.18 g/cm3, by addition of aluminium powder in correlation to solution amount - 1.2-2.1. Then it is implemented layer drying and it is applied layer made of above mentioned binding with density 1.12-1.15 g/cm3. Then it is implemented final drying.

EFFECT: invention provides receiving of coating operating in conditions of cyclic high-temperature loading up to 500°C, and also to increase its durability and corrosion resistance.

12 cl, 3 ex, 3 dwg

FIELD: chemistry.

SUBSTANCE: invention refers to polymeric compound for improved corrosion resistance coating to be used for corrosion protection of structural components of metal and concrete buildings, pipelines, metal carriers and assemblies for various engineering fields, to design wear-proof self-levelling floors being solvent and oil resistant, as well as for decorative finish of the surfaces specified above. The compound is two-component and is generated by combining component A and component B in ratio 1:0.01 to 1:100. Component A contains the following components in ratio, wt %: diane epoxy resin 60-62, aliphatic epoxy resin 12-13, basalt bulk additive 26-27. Basalt bulk additive is andesite basalt scale of fraction size 0.001-0.4 mm. Component B is mixed oligoamide hardener in amount 71-73 wt % and specified andesite basalt scale in amount 27-29 wt %. Hardener is aromatic oligoamide ETAL. Invention allows for lower toxicity of compound, improved barrier protective properties, and extended functional area.

EFFECT: lower toxicity of compound, improved barrier protective properties, and extended functional area.

2 tbl

FIELD: chemistry.

SUBSTANCE: invention refers to versions of solidificated powder coating composition and to method of cathodic protection of steel substrate. According to the first version, the composition contains as follows: (a) thermosetting resin, (b) zinc borate compounds in amount 0.5 to 4.75 wt % in relation to total solid weight, (c) curing agent for the specified structure, in amount effective for coating solidification, (d) filler, pigment and additive. Thermosetting resin is epoxy with functional groups of A/epichlorhydrin bicphenol. Curing agent is accelerated dicyandiamide or phenolic curing agent. According to the second version, the composition contains thermosetting epoxy, curing agent specified above, and zinc borate compound in amount 0.5 to 4.75 wt % in relation to total solid weight. Method of cathodic protection consists that steel substrate is machined and covered with the composition of the first version. It is followed with polarisation of steel substrate covered as cathode.

EFFECT: higher long-time cathodic disbandment resistance with high temperature and humidity application.

14 cl, 3 tbl, 6 ex, 1 dwg

Heat protective dye // 2245350

FIELD: chemical industry, paint-vehicle systems, in particular heat protective dyes.

SUBSTANCE: claimed dye contains ceramic and corundum microspheres; resins, selected from group including silicone resin, polyesterepoxy resin, acrylic resin dispersions as binder; pigment; and aluminum powder as deflector. Such composition provides reduced heat loss into environment. Obtained dyes have thermal gradient, improved heat-retention properties and strength, and useful in corrosion and heat-loss protection of building construction, transport, gas and oil lines, heating systems, etc.

EFFECT: easier method for dye production; strength and homogenous heat protective dye layer of improved adhesiveness.

2 cl, 3 tbl

FIELD: polymer materials and corrosion protection.

SUBSTANCE: invention relates to cold-drying anticorrosive coating compositions, which can be used in petroleum, gas, power, chemical, and other industries for protection surfaces of iron articles and structures. Composition of invention is based on binder, namely alkyd-styrene resin or poor alkyd resin in amount 11.0-44.0%. Composition further comprises 0.3-5.0% tannin or tannin derivatives as anticorrosive additive, 3.0-24.0% pigments, 5.0-22.-% fillers, and balancing amount of organic solvent.

EFFECT: enhanced protective properties.

4 cl, 2 tbl, 5 ex

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