Corrosion-resistant coating and method of processing metal structures

 

(57) Abstract:

The invention relates to a method of anticorrosive treatment of metal structures by applying to the surface of the corrosion-resistant metallic coating and can be used, for example, to process supports the air lines, open distribution devices of high-voltage substations, guardrails, load-bearing structures of industrial buildings and structures, fixtures and other products. Describes anti-corrosion coating, which is made of layered and consists of a primer consisting of at least two layers formed from a material containing fine powder of zinc in the environment orhangazispor thermoplastic binder, and at least one coating layer formed from a material containing aluminum powder in the environment orhangazispor thermoplastic binder. As thermoplastic binder used polystyrene and/or a copolymer of styrene and rubber. Also describes the method of processing metal structures. The invention allows to obtain a corrosion-resistant coating with high aesthetic southwesterly, having high corrosion resistance throughout the range of aggressiveness air environment and areas of moisture while simplifying and cheapening the method of its deposition on the workpiece surface. 2 S. and 1 C.p. f-crystals, 2 tab.

The invention relates to a method of anticorrosive treatment of metal structures by applying to the surface of the corrosion-resistant metal coating and can be used, for example, to process supports the air lines, open distribution devices of high-voltage substations, guardrails, load-bearing structures of industrial buildings and structures, fixtures and other products.

To provide corrosion protection products intended for prolonged use in conditions slightly aggressive, mid-aggressive and very corroded environment, known metal coating with a film thickness of 60 to 300 μm, for example zinc, which is applied by hot dip galvanizing, thermal sprayed zinc or electrochemical anodization ["Protection of building structures against corrosion" Construction norms and rules N 2.03.11-85, Publishing house of the USSR State Committee on releaseplan zinc, unacceptable for processing large dimensions and requires high energy consumption. Method of thermal spraying though and is applicable for processing dimensional structures, however, associated with high energy costs and high losses of zinc during its deposition on the surface. The method of electrochemical anodization requires considerable effort associated with high requirements to the quality of the processed surface and high energy costs.

Closest to the proposed are methods of anticorrosion treatment of metal construction and equipment, which consists in applying to the pre-prepared surface of the anticorrosive coatings formed from compositions containing fine zinc powder and organorazbavljaemye binder.

For example, the known multi-layer coating consisting of a primer layer formed from a material containing a thermoplastic film former (L. I. Popilov New materials for shipbuilding. Sudostroenie, Leningrad, 1972, 433-434).

Using known coating allows to reduce energy consumption in anticorrosive processing, however, is nagresign very corroded and environments. This is due, first of all, its lack of electrochemical (cathodic) protection. Sacrificial protection vysokoriskovannyh coatings is that the zinc and steel form a galvanic couple, where the zinc is the anode, and the defective places oxidized zinc, not metal, which is coated. At high content of zinc its particles are in contact with each other. This ensures that the electrical conductivity of the coating and cathodic protection of steel. With insufficient content of zinc in the defective areas covering the pores, scratches, chips causes corrosion of the base metal. In addition, application of a known coating requires rigorous standards of surface preparation.

The present invention is the creation of a corrosion-resistant coating with a high aesthetic properties, providing long-term electrochemical protection, suitable for application, including overall product having high corrosion resistance throughout the range of aggressiveness air environment and areas of moisture while simplifying and cheapening the way it is applied on the surface.

This object is achieved in that the ore from two layers, formed from a material containing fine powder of zinc, polystyrene and/or styrene rubber and organoarsenical the following composition, wt.%:

Superfine powder of zinc - 50-78

Polystyrene and/or styrene to rubber - 2,5-7,5

Organic solvent - Rest

and at least one coating layer formed from a material containing aluminum powder, polystyrene and/or styrene rubber, organoarsenical the following composition, wt.%:

Aluminum powder - 5-10

Polystyrene and/or styrene to rubber - 9-15

Organic solvent - Rest

The method of anticorrosive treatment of metal structures is applied on prepared surface of the multilayer zinc-containing coating, characterized in that the first form the primer layer by sequentially applying at least two layers, with layers made of a material containing fine powder of zinc, polystyrene and/or styrene rubber and organoarsenical the following composition, wt.%:

Superfine powder of zinc - 50-78

Polystyrene and/or a copolymer stir the re one coating layer, made of a material containing aluminum powder, polystyrene and/or styrene rubber, organoarsenical the following composition, wt.%:

Aluminum powder - 5-10

Polystyrene and/or styrene to rubber - 9-15

Organic solvent - Rest

Preliminary preparation of the surface lead by degreasing, descaling and rust. Application of a layer on the processed surface of the lead by means of air or airless spray, brush, roller, dipping.

As the material forming the primer layer, using a material manufactured under the trade name "Tsinol" as a copolymer of styrene and rubber using high impact polystyrene according to GOST 28250-89.

As a material forming the surface layer, using a material manufactured under the trade name" Made".

In science and technology known to use aluminum powder as additives to the materials forming the coating, to ensure, primarily, its aesthetic properties. Protective characteristics of aluminium-containing coatings formed from materials containing organorazbavljaemye film formers, equivalently surface from the corrosive environment.

In our proposed method, the application of aluminium-containing layer on the pre-coated with a primer layer surface, increases the corrosion resistance of the coating as a whole while reducing the overall thickness of the coating. So when using products, treated by the claimed method, the corrosion resistance of steel structures when operating in conditions of high aggressiveness of air increases by 5-7 years. The proposed coating provides protection of steel structures against corrosion, equivalent gorjacheotsinkovannom coating with a minimum thickness of 60 microns.

Thus, the application of the proposed method of processing metal structures leads to improvement of the corrosion resistance of zinc-containing layer and coating in General, reducing the cost of coverage. This may be due to the fact that in the proposed coverage is not only preserved electrochemical (cathodic) protection mechanism against corrosion, but, in addition, the presence of the inventive coating layer provides adequate protection from solar radiation that can destroy the structure of the coating, provides for the creation of a dense film due to the dense aluminum with chechenkakariena layer and eliminates the possibility of formation of white spots, spoiling the appearance of the product. In addition, the applied layers have high adhesion to both the treated surface and to each other, characterized by equal coefficients of expansion. This in turn leads to high mechanical strength of the coating.

Despite the fact that science and technology are known to use coating layers, such as paint, application of the previously known coating layers on the corrosion of zinc-containing coating did not provide achievable us to increase their corrosion resistance and mechanical strength in thin layers of a coating comprising not more than 100 microns.

The inventive method of anticorrosive treatment simplifies existing technology, reduces its cost by reducing raw materials and labor, and eliminates the need for careful preparation of the surface before treatment.

So when the phased application of a known material appeared technological difficulties associated with the fact that each of the sequentially applied highly zinc-containing layers have the same color and shade, which makes visual inspection of the required rating. The lack of production areas and otsutstvie when forming the coating or poor its application. Replacement of at least one zinc-containing layer on the aluminium-containing solves these challenges and significantly reduces the consumption of highly zinc-containing material, reducing the overall power consumption of the primer material and the cost of coverage.

The inventive coating and method of processing metal structures with its use is illustrated by the following examples.

Example 1 (inventive)

Anticorrosive processing standard steel sample size HH mm was performed by pneumatic spray the primer on the precleaned surface of the sample. A primer layer formed from zinc-containing material "Tsinol", consistently applied in two stages. Each of the deposited layers was dried in natural conditions within 20-30 min. Thickness of one zinc-containing layer of 30-40 μm. The formed primer layer was applied coating layer, made of aluminium-containing material "Made" by pneumatic spraying. The drying is conducted under natural conditions within 20-30 minutes the thickness of the coating layer is about 10 microns.

"Tsinol" is a composition containing, by weight. %:

Superfine powder of the Qing

Made is a composition comprising, in wt.%:

Aluminum powder - 5-10

Polystyrene and/or styrene to rubber - 9-15

Organic solvent - Rest

Processed samples with a total coating thickness of 90 μm was subjected to standard tests. The data are given in table. 1 and table. 2.

Example 2 (control)

Anticorrosive processing standard steel sample size HH mm was performed by pneumatic spray the primer on the precleaned surface. A primer layer formed from a material "Tsinol", applied in a single layer with a thickness of 30 μm. Galvanized samples were dried in natural conditions for 20-30 minutes, then put top coat layer formed from a material "Made" by pneumatic spraying. The drying is conducted under natural conditions within 20-30 minutes the thickness of the coating layer is 10 μm.

Processed samples with a total coating thickness of 40 μm was subjected to standard tests. The data are given in table. 1 and table. 2.

Example 3 (control)

Anticorrosive processing standard steel sample size HH mm were carried out by pneumatic px sequentially deposited layers, made from Canola", each of which was dried in natural conditions within 20-30 min. layer Thickness of 30-40 μm. Processed samples with a total coating thickness of 80 μm was subjected to standard tests. The data are given in table. 1 and table. 2.

Example 4 (control)

Anticorrosive processing standard steel sample size HH mm was performed by pneumatic spray the primer on the precleaned surface. A primer layer was formed of three sequentially deposited layers made of "Canola", each of which was dried in natural conditions within 20-30 minutes of the Layers has a thickness of 30-40 μm. Processed samples with a total coating thickness of 120 μm was subjected to standard tests. The data are given in table. 1 and table. 2.

Example 5 (control)

Surface standard steel sample size HH mm was purified by carrying out machining, degreasing and phosphating according to well-known techniques. Anticorrosive processing performed by hot dip galvanizing on standard technologies in industrial baths. Processed samples with a single layer of zinc coating thickness of 60 μm was subjected to the standard are given in table. 1 and table. 2. Adhesion is determined by the method of lattice cuts (GOST 15140-78). Impact strength according to GOST 6806-73. The standard potential for THE 0165-12-95.

Properties of the inventive coatings:

(adhesion method of lattice cuts no more than 2 points;

the impact strength of at least 3 j;

elasticity in flexure of not more than 4 mm;

the initial stationary potential is not more than 0.95 IN;

regarding horsebang electrode accelerated climatic tests according to GOST 9.401, the method 20 can withstand not less than 1500 hours without corrosion damages of steel.

Decorative properties of the coatings produced according to example 2, substantially changed after thermostate them at a temperature of 60oC for 120 hours.

Applying a top coat of example 1 does not reduce the physical-mechanical properties, however, significantly increases the resistance and retains its decorative properties. Improving the quality of coverage is likely to be due primarily overlap then the primer coating and the emergence of a diffusion barrier to the penetration of the electrolyte to the substrate coating.

As can be seen from the above data, the inventive coatings are characterized by high anticorrosion the mechanism of protection of metal surfaces from destruction.

Conducted atmospheric bench tests of the coatings and the results of the electrochemical measurements showed that the rate of change of properties of the inventive coating similar to the coating obtained by the method of hot-dip galvanizing.

The inventive coating can be especially effective in the absence of an enterprise capability to strict requirements for the degree of surface preparation before coating.

1. Corrosion-resistant coating made of layered and consists of a ground layer formed of a material containing a thermoplastic film former, wherein the coating is made of a soil layer that includes at least two layers formed from a material containing fine powder of zinc, polystyrene and/or styrene rubber and organoarsenical the following composition, wt.%:

Superfine powder of zinc - 50 - 78

Polystyrene and/or styrene to rubber - 2,5 - 7,5

Organic solvent - Rest

and at least one coating layer formed from a material containing aluminum powder, polystyrene and/or styrene rubber, organoarsenical the - 15

Organic solvent - Rest

2. The method of anticorrosive treatment of metal structures, which consists in applying to the pre-prepared surface of the multilayer metal-containing coating, wherein the first form the primer layer by sequentially applying at least two layers made of a material containing fine powder of zinc in the environment orhangazispor thermoplastic film-forming agent of the following composition, wt.%:

Superfine powder of zinc - 50m - 78

Polystyrene and/or styrene to rubber - 2,5 - 7,5

Organic solvent - Rest

With the subsequent application of a coating layer made of a material containing aluminum powder in the environment organizziamo thermoplastic, film-forming agent of the following composition, wt.%:

Aluminum powder - 5 - 10

Polystyrene and/or a copolymer of styrene-rubber - 9 - 15

Organic solvent - Rest

3. The method according to p. 2, characterized in that the preliminary preparation of the surface of the lead by removing scale and corrosion products.

 

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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

FIELD: corrosion protection.

SUBSTANCE: protective ground paint for painting coiled metal and electrochemical protection of bridges, power lines, and other long term-use metallic structures contains, wt %: epoxide resin 9.0-29.0, polyamide resin 3.0-9.5, pigment 23.0-36.0, zinc nanoparticle preparation 3.0-5.0, filler 13.0-23.2, and solvent - the balance. Zinc nanoparticle preparation is introduced in the form of (0.4-4)x·10-3 M solution in isooctane.

EFFECT: enhanced protective properties.

2 tbl, 4 ex

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