Oxidized alloys resistant to corrosion accompanied by metallic dust formation
FIELD: materials resistant to corrosion accompanied by metallic dust formation; methods of manufacture of such materials, reactor materials in particular subjected to action of media supersaturated with carbon.
SUBSTANCE: proposed material contains alloy and protective oxide coat on base of alloy. Protective oxide coat consists of at least two oxide layers: first layer which is farthest from surface of alloy is made from manganese oxide. Alloy contains base metals including iron, nickel and cobalt and alloying metals including chromium and manganese; concentration of manganese is at least 10 mass-% and concentration of chromium is at least 25 mass-%. Total content of chromium and manganese is no less than 40 mass-%.
EFFECT: enhanced resistance of material to corrosion with metallic dust formation in media supersaturated with carbon.
2 dwg, 1 tbl, 1 ex
The technical field
The invention concerns a method for controlling corrosion of metal dust in the case of reactor materials exposed to environments that are saturated with carbon, and also relates to the composition of the material.
The level of technology
In many processes for the conversion of hydrocarbons, such as, for example, conversion of CH4to synthetic gas, faced with the fact that environments have high activity carbon and relatively low oxygen activity. Materials for high temperature reactors and materials for heat exchangers used in such processes can fail during operation under the action of a very aggressive form of corrosion known as metal dusting.
Metal dusting is a very destructive form of corrosion that affects the alloys based on Fe, Ni and Co at a temperature in the range from 400 to 900°in environments saturated with carbon (active carbon >1), and with relatively low (approximately 10-10up to 10-20ATM) partial pressure of oxygen. This form of corrosion is characterized by a decaying lump of metal with the formation of the metal powder. Despite the fact that many commercially available alloys are designed to form a protective film of Cr2 3or Al2About3in environments with low partial pressure of oxygen, the formation of crystallization centers and the kinetics of growth of these oxides are often not high enough to block the penetration of carbon in the case of environments with active carbon over units.
Described in the literature methods of regulation corrosion with metal dust generation include the application of surface coatings and gaseous inhibitors, especially N2S. the Coating may deteriorate due to diffusion of the constituents of the coating to the substrate alloy. Thus, although the coverage and represent a viable approach to solving the problem in the case of short-term protection, in General, they cannot be recommended for long-term conditions services for a period of 20 years or more. Inhibition of H2S has two drawbacks. First, H2S tends to poisoning of the most catalysts used in the conversion of hydrocarbons. In addition, H2S should be removed from the exit stream that can significantly increase the cost of the process.
Thus, in the art there is a need in the material, resistant to corrosion with metal dust formation in supersaturated with carbon (active carbon >1) environments with low (approximately 10-10up to 10-20atmospheres) p is realnum pressure of oxygen.
Disclosure of inventions
The invention relates to a material resistant to metal dusting, and includes (a) an alloy capable of forming a protective oxide coating on its surface under the influence of environments saturated with carbon, (b) a protective oxide coating, comprising on the surface of the specified alloy of at least two layers, which are formed under the influence of contributing to metal dusting environments with low partial pressure of oxygen. The outer layer, also called the first layer (the layer in contact with supersaturated with carbon environment, or the most remote from the alloy layer), made of a thermodynamically stable oxide, which can quickly cover the surface of the alloy and to block the flow of carbon in the alloy. The first layer is thermodynamically stable oxide of manganese, which is formed faster than the carbon supersaturated environment they can penetrate the surface of the alloy. Therefore, the manganese oxide is attributed to the rapidly forming layer. Under a layer of manganese oxide, the second layer (here he named the second oxide layer) is formed or simultaneously with the formation of this layer of manganese, or after him. The second layer of the protective oxide coating is an oxide film, which is created under a layer of oxide is manganese and is adjacent to a layer of oxide of manganese, and its composition depends on the composition of the alloy from which it is formed. Consequently, the invention relates to a corrosion resistant metal dust material, comprising (a) alloy and (b) a protective oxide coating on the specified alloy, where the specified protective oxide coating includes at least two oxide layer, the first oxide layer is a layer of oxide of manganese, and the specified alloy includes alloying metals and base metals, and these alloying metals include a mixture of chromium and manganese, and these metals include iron, Nickel and cobalt, with the specified manganese is present in the specified alloy at a concentration of at least about 10 wt.% Mn, and the chromium is present in the specified alloy at a concentration of at least about 25 wt.% Cr and the total amount of chromium and manganese is ≥40 wt.%, and said first oxide layer is the most remote from the said surface of the alloy layer.
The protective oxide coating can be formed in situ during use of the alloy in an environment saturated with carbon, or you can cook it, subjecting the alloy, before application of the environment, saturated with carbon. The advantage of this invention is that in the event of cracking of the protective oxide layer when using the implement of the alloy in the environment, saturated with carbon, the protective coating is formed in the fracture will heal oxide layers, shielding, thereby, when using the alloy from the metal dust.
The invention also covers a method of preventing metal dust on metal surfaces exposed to environments that are saturated with carbon; this method involves the creation of the specified metal surface of a material resistant to metal dusting, or the application of a specified metal surface coating of such resistant to metal dusting material comprising a metal alloy comprising alloying metals and base metals, and these alloying metals include a mixture of chromium and manganese, and these metals include iron, Nickel and cobalt, while the manganese is present in the specified alloy at a concentration of at least about 10 wt., % Mn, and the chromium is present in the specified alloy at a concentration of at least about 25 wt.% Cr and the total amount of chromium and manganese is ≥40 wt.%, and said first oxide layer is furthest from the surface of the alloy layer.
Metal surfaces can be created from this alloy, or covered in this alloy, as described above protective hydroxy is Naya film is formed in situ during operation of the plant in the environment, supersaturated with carbon.
Therefore, the invention also covers protective oxide coating that includes at least two oxide layer, where the first layer is a layer of oxide of manganese, and the first layer is the layer at the specified alloy, which is the most remote from the specified alloy layer.
Brief description of drawings
Figure 1 shows performed using scanning electron microscopy image of a two-layer oxide protective film on the alloy, the composition of which 20,1 Fe, 39,4 Ni, 10,0 Mn, 30,5 Cr, after the metal dust at 650°C for 160 hours in an environment of 50 CO-50 N2.
The implementation of the invention
Alloys are formed is described in the application of the protective film include alloys containing a mixture of chromium and manganese. Chromium and manganese in this context referred to as alloying elements. In addition to these alloying elements, alloys contains basic metals. Basic metals form a large part of the alloy and, therefore, are present in amounts of more than about 44% of the total alloy. Thus, in addition to chromium and manganese, alloys can be other metals, called in the context of this application, basic metals, including iron, Nickel, cobalt and mixtures thereof. The alloys can also be additional legious the e elements, such as silicon and aluminum. It is preferable to use Fe-Ni-Mn-Cr alloys.
Basic metals forming alloys in the context of this application, are selected from iron, Nickel and cobalt, or mixtures of these three elements. Base metals may be present in any combination or alloys can be applied only base metal.
The alloys according to this invention can be applied to construct surface facilities that will be exposed to environments conducive to metal dusts, or can existing surface susceptible to metal dusting, to cover such alloys using techniques known in the art. For example, you can apply techniques such as thermal spraying, plasma deposition, chemical deposition from the gas phase and the metallization coating. Therefore, oil installation, you can either design described in this application alloys, or to put on them cover their these alloys, while the protective oxide film is formed or at the time of installation, or prior to use installation.
When used as coatings on existing surfaces, the thickness of such coatings will be in the range from about 10 microns to about 200 microns, site is preferably from about 50 microns to about 100 microns.
Surface, which will benefit from the use of this invention include the surface of any installations or reaction systems that are in operation in contact with environments, supersaturated with carbon, including the surface of the reactors, heat exchangers, pipelines, etc.
Described in this application of the protective coating or film on the surfaces of the alloys are formed on this alloy under the influence of an environment conducive metal dusts, such as a mixture of 50 CO:50 H2. Therefore, the protective coating can be formed during the application of the alloys under the reaction conditions at which the alloys are exposed to environments conducive to metal dusts, or before such application. The preferred range of temperature is from about 350°up to about 1050°C, preferably from about 550°up to about 1050°With a typical exposure time may be in the range from about 1 hour to about 200 hours, preferably from about 1 hour to about 100 hours.
The following examples, which are illustrative and do not limit the invention.
Electric-arc smelting prepared alloys with different concentrations of Fe, Ni, Mn and Co. Received arc melting alloys are laminated in t is nkiye sheets of a thickness of about 1/16 inch (strength of 0.159 cm). The sheets were annealed overnight at a temperature of 1100°in the inert atmosphere of argon and cooled in the furnace to room temperature. These sheets are then cut out samples of rectangular shape with a size of 0.5 inch×0.25 inch (1.27 cm×0,635 cm). The sample surface was polished or until surface conditions, with the degree of roughness 600, or until the surface condition Linde (alumina powder of 0.05 μm) and washed in acetone. Samples of all metals used in experiments on metal dusting, were analyzed by energy dispersive x-ray spectroscope attached to a scanning electron microscope. The results of chemical analysis are presented in table 1.
|The increase of mass due to the deposition of carbon (the unit of measurement of corrosion with metal dust) on finished surfaces Linde In a variety of Fe-Ni-Mn-Cr alloys at 550°and 650°C, gas mixture 50 CO-50 N2after 160 hours of corrosion|
|The composition of the alloy, wt.%||Number (Mn+Cr), wt.%||The increase in the mass (mg/cm2) at 550°||The increase in the mass (mg/cm2) at 650°|
|30,4 Fe; 30,4 Ni; 14,7 Mn; 24,5 Cr||118,0˜122,0||90,0˜95,0|
|20 Fe; 40,5 Ni; 14,9 Mn; 24,6 Cr||39,5||65,0˜67,0||28,0˜32,0|
|20,1 Fe; 39,4 Ni; 10,0 Mn; 30,5 Cr||40,5||21,0˜24,0||carbon is missing|
|30,0 Fe; 29,5 Ni; 10,2 Mn; 30,3 Cr||40,5||17,0˜19,0||carbon is missing|
|19,7 Fe; 32,9 Ni; 14,4 Mn; 33,0 Cr||47,4||0,7˜0,9||carbon is missing|
|14,8 Fe; 39,3 Ni; 14,9 Mn; 31,0 Cr||45,9||0,5˜0,9||carbon is missing|
|45,0 Fe; 29,5 Mn; 25,5 Cr||55,0||0,2˜0,5||carbon is missing|
|24,9 Fe; 19,6 Ni; 28,9 Mn; 26,6 Cr||55,5||0,7˜1,2||carbon is missing|
|59,8 Ni; 14,0 Mn; 26,2 Cr||40,2||1,2˜1,7||carbon is missing|
|7 Fe; 77 Ni; 16 Cr (ln 600)*||120,0˜130,0||60,0˜65,0|
|20 Fe; 45 Ni; 35 Cr (35/45)**||230,0˜250,0||140,0˜160,0|
|* - Alloy Inconel 600 (N06600)|
** - Alloy, resistant to carburizing, 35/45 (KHR-45A)
The samples were subjected to gaseous sredy CO-50 N 2for 160 hours, which Is a particularly aggressive mixture of gases, in which most high-temperature alloys exposed to metal dust. A few selected for testing commercial alloys were also subjected to the same conditions.
Careful electron microscopy subjected to studies of the alloys showed that certain alloy compositions in the system Fe-Ni-Mn-Cr corrosion resistant metal dust. It was determined that a two-layer protective oxide film, which consists of external MnO layer and the inner MnCr2O4the layer is above reason, resistance to metal dusting. Figure 1 shows performed using scanning electron microscopy image of a two-layer protective film on the alloy composition 20,1 Fe; 39,4 Ni; 10,0 Mn; 30,5 Cr after exposure to saturated carbon environment (50 CO-50 N2)promoting metal dusts, at approximately 650°C for 160 hours. On the surface of the sample is not observed deposition of carbon, which is always accompanied by corrosion of metallic dust. Resistant to carburizing commercial alloy composition indicated in figure 2, has suffered as a result of extensive metal dust. Performed using scanning electron m is croscope image shown in figure 2, demonstrates the dot morphology correlated areas after metal dust at 650°C for 160 hours in an environment of 50 CO-50 N2that is a distinctive feature of metal dust. Figure 2 also shows the deposition of carbon, invariably accompanies such an effect.
In table 1 shows the resistance of the Fe-Ni-Mn-Cr alloys to corrosion with metal dust at a temperature of 550°and 650°C. Since the metal dust is usually accompanied by precipitation of carbon as the unit of measurement of corrosion with metal dust, you can use the increase in mass caused by the deposition of carbon. Determined the increase in mass of various Fe-Ni-Mn-Cr alloys with surface conditions that meet Linde, after corrosion in gas mixture 50 CO-50 N2for 160 hours at 550°and 650°respectively.
1. The material is resistant to corrosion with metal dust, including alloy and a protective oxide coating on the specified alloy, while the protective oxide coating contains at least two oxide layers, the first of which, the most remote from the surface of the alloy made of oxide of manganese and alloy contains basic metals, including iron, Nickel and cobalt, and alloy metals, Inc is committed to chromium and manganese, the concentration of manganese is at least 10 wt.%, the concentration of chromium is at least 25 wt.%, and the total content of chromium and manganese is not less than 40 wt.%.
2. The method of obtaining material, resistant to corrosion with metal dust when exposed to a saturated carbon environments, including the creation of a metallic surface of a metallic alloy containing metals, including iron, Nickel and cobalt, and alloy metals, including chromium and manganese, the concentration of manganese in the alloy is at least 10 wt.%, the concentration of chromium is at least 25 wt.%, while the total content of chromium and manganese is not less than 40 wt.%, and protective oxide coating containing the first oxide layer of the oxide of manganese, which is furthest from the surface of the alloy layer.
3. The method according to claim 2, in which the protective coating contains a second oxide layer.
4. The method according to claim 3, in which the protective oxide coating formed during use of the alloy in the saturated carbon environment conducive to metal dust.
FIELD: foundry, possibly technology, painting art and architecture.
SUBSTANCE: method comprises steps of forming pattern of article for making according to it rough mold; performing sand blasting of working surface of rough mold; depositing onto its surface layer of alloy being material of decorative article; releasing deposited layer from rough mold due to difference of thermal expansion factors of materials of deposited layer and substrate.
EFFECT: possibility for making thin-wall decorative articles of metals and alloys with high surface quality, small mass due to their porous structure and thin wall and with mechanical properties sufficient for using article in interior.
4 dwg, 1 ex
FIELD: different industries; methods of manufacture of the spindles out of the steel for the pipeline fittings.
SUBSTANCE: the invention is pertaining to the method of manufacture of the pipeline fittings, in particular, the spindles, shutters and valves for shutting and control of consumption off the mediums passing through the pipelines. The method includes the thermal treatment and the mechanical working with formation of the threading. After the mechanical working exercise nitriding by the vacuum ion-implantation method at the temperature of T = (320-450)°С, the voltage - U = (250 - 750)V and during the time t = (20-60) minutes. The technical result consists in the increased reliability and the service life of the pipeline fittings.
EFFECT: the invention ensures the increased reliability and the service life of the pipeline fittings.
3 cl, 1 ex, 2 dwg
FIELD: manufacture of articles with normalized properties of surface layer, namely for improving strength of press tools at pressing shapes of titanium alloys.
SUBSTANCE: method comprises steps of surfacing hard alloy layer forming reinforcing structure onto base material; applying by electric spark alloying layer of hard alloy having plastic components onto surfaces layer of hard alloy in order to provide coating with reinforcing effect; then applying onto surface of formed coating additional layer having oil-phobic properties.
EFFECT: enhanced strength of part with such coating, lowered stresses of base metal.
2 cl, 1 ex
FIELD: building industry; method and devices allowing to make the three-dimensional visual effects on the surface of the metallic material.
SUBSTANCE: the invention is pertaining to application of the coatings on the surfaces of the metallic materials. The method provides for application of the coating made out of the metal or out of the metal alloy. The first layer of the applied coating has the depth smaller or equal to 2.5 microns. Then conduct the thermal treatment of the first layer of the coating by means of the fast heating by heating the surface of the first layer of the coating up to the temperature laying within the limits from0.8 Tf up tothe temperature of Tf, whereTf is the temperature of smelting of the metal or the metal alloy, which is used in application of the first layer of the coating. Then they apply the second layer of the coating from the metal or the metal alloy with the depth smaller or equal to 1 micrometer. The invention also presents the material containing the indicated layers as well as the device for application of the coating on the metallic material in the form of the strip, which contains the tool for the strip pulling and the tool for application of the coating. On the path of motion of the dawn strip there are in series mounted the following tools: the tool for application of the first layer on the strip; the strip fast heating tool, which is capable to heat the surface of the first layer up to the above-indicated temperature; the tool for application on the strip of the second layer of the metal or the metal alloy. The technical result of the invention is creation of the method and the device allowing to produce the three-dimensional visual effects on the surface of the metallic material.
EFFECT: the invention ensures creation of the method and the device for production of the three-dimensional visual effects on the surface of the metallic material.
24 cl, 6 dwg, 8 ex
FIELD: electrophysical and electrochemical treatment processes such as electric-erosion alloying, possibly treatment of surfaces of inserts of sliding bearing assemblies.
SUBSTANCE: method comprises steps of applying onto working surface of inserts by electric-erosion alloying with use of tool-electrodes layers of silver, copper and tin-base babbitt. Electrochemical coating of silver and copper is applied at pulse energy 0.01 - 0.05 J and coating of tin-base babbitt is applied at pulse energy 0.01 - 0.06 J. Coating layers are applied in different directions: crosswise, lengthwise and by inclination angle relative to surface at least of one block of inserts. Inserts having micro-relief on their working surfaces feature enhanced carrying capacity.
EFFECT: improved operational reliability, carrying capacity of inserts.
2 cl, 5 dwg
FIELD: machine engineering, namely tool strengthening method, possibly for increasing operation resource of metal cutting tools, for example of cold forging punches.
SUBSTANCE: method comprises steps of saturating working surface of tool with nitrogen by depth 30 - 40 micrometers before applying multiple-layer coating for performing compensation of difference of thermal-physical-mechanical properties of coating and tool materials; applying onto nitrogen-saturated surface mutually alternating intermediate and compensating layers. Hardness of next intermediate layer is higher than that of previous one. Intermediate layers provide gradual change of hardness from substrate to surface of coating and therefore they provide increased impact viscosity. Compensating layers made of pure titanium or chrome provide bonding between layers. After applying each layer, ion polishing is realized. Last surface layer is made of plastic material used for running and concealing micro-cracks of wear-resistant layer of coating.
EFFECT: enhanced resource of tool subjected to dynamic loads at operation.
FIELD: chemical industry; other industries; manufacture of the articles with the decorative-protective coatings having the stainless steel color.
SUBSTANCE: the invention is pertaining to the articles, on which the multilayered decorative-protective coating having the appearance or the color of the stainless steel. At least a part of the article surface has the decorative-protective multilayered coating. The coating contains at least one electrolytic layer and one coloring layer. The coloring layer consists of the refractory metal oxide or the oxide of the alloy on the basis of the refractory metal. The stoichiometric content of oxygen in the indicated oxides makes from 5 up to 25 atmospheric percents. On the coloring layer there may be arranged the layer of the refractory metal oxide or the oxide of the alloy on the basis of the refractory metal having the stoichiometric oxygen content or the layer with the smaller, than the stoichiometric oxygen content. The technical result of the invention is creation of the decorative coating having the wear resistance against corrosion and the abrasion resistance.
EFFECT: the invention ensures creation of the decorative coating having the wear resistance against corrosion and the abrasion resistance.
18 cl, 3 dwg, 1 ex
FIELD: chemical industry; food industry; methods of production of the protective coating on the surface of the metal.
SUBSTANCE: the invention is pertaining to the field of chemical industry and food industry, in particular, the invention may be used at production on the metallic surfaces of the details of the coatings resistant to the action of the aggressive and high-temperature mediums, mainly of the anti-adhesive coatings in the chemical engineering and the alimentary engineering. The method provides for the plasma spraying of the adhesive metallic substrate and the subsequent forming of the layer of fluoroplastic with its meltback. The plasma spraying of the adhesive substrate is exercised at the electric current intensity of 90-110 A, the voltage of 30-45 V with its subsequent heat treatment at the temperature of650-800°С. The meltback of the fluoroplastic coating is conducted at the temperature of 250-270°С within 3-5 hours. Then the adhesive substrate made on the basis of the copper-zinc alloy is sprayed on. The protective coating is produced on the surface of the aluminum alloy or the carbon steel. The technical result of the invention consists in the increased strength of the cohesion of the coating with the substrate due to reduction of the thermal tensions between them.
EFFECT: the invention ensures the increased strength of the cohesion of the coating with the substrate due to reduction of the thermal tensions between them.
2 cl, 2 ex
FIELD: electrochemical processes; production of electrodes used for electrolysis, electrophoresis and electrosynthesis.
SUBSTANCE: proposed electrode is made from titanium or its alloys and is provided with electrocatalytic coat made from ruthenium and titanium oxides at the following ratio, mole-%: 25-30:70-75; it includes intermediate sublayers made from titanium oxide and formed by plasma electrolytic oxidation. Method of production of electrode includes application of electrocatalytic coat made from ruthenium and titanium oxides on base made from titanium or its alloys at ratio, mole-% of 25-30:70-75 by thermal decomposition of ruthenium and titanium salts. Prior to application of electrocatalytic coat, intermediate sublayers made from titanium oxides are applied onto base by plasma electrolytic oxidation.
EFFECT: enhanced electrocatalytic activity with no activation before each switching-on; reduced power requirements.
4 cl, 1 dwg, 1 tbl, 2 ex
FIELD: mechanical engineering; other industries; production of materials with antifriction coatings for the sliding friction pairs.
SUBSTANCE: the invention is pertaining to the materials for the pairs of sliding friction and may be used in mechanical engineering and other branches of industry. The composite antifriction coating on the components made out of aluminum alloys contains the external antifriction layer and the arranged between it and the base made out of the aluminum alloy the layer of the ceramic-oxide of 50...300 microns thick. The external antifriction layer is made out of copper or the copper based alloy, and its thickness compounds 2...10 microns. The method of manufacture of the given coating provides for formation of the ceramic-oxide layer with the open porosity by the anode-cathode microarc oxidation and the subsequent antifriction layer costing. Before the antifriction layer coating from the ceramic-oxide surface remove the layer with porosity exceeding 10 %. Then the component is treated with the lubricant on the basis of technical glycerin. The antifriction layer is applied using the mechanically-frictional method. The rubbing plate made out of copper or on the copper basis press to the surface of the ceramic-oxide with the monotonically increasing contact pressure. The rubbing plate is heat-insulated from the pressing component of the device for rubbing and has the form of the contacting it surface. The technical result of the invention is expansion of the capabilities to create the composite antifriction coatings on the details made out of aluminum alloys, which shapes limit the possibility of their heating because of buckling.
EFFECT: the invention ensures expansion of the capabilities to create the composite antifriction coatings on the surfaces of the details made out of aluminum alloys, which shapes limit the possibility of their heating because of buckling.
3 cl, 1 dwg
FIELD: metallurgy, namely chemical and heat treatment of refractory alloys, possibly used for applying protective coatings onto blades of gas-turbine engines.
SUBSTANCE: method comprises steps of applying onto inner and outer surfaces of parts diffusion aluminide coating in circulating gaseous medium; applying coating in low-active system at relation of reaction surfaces Fн/Fo = 0.3 - 0.7, where Fн - total surface of parts to be coated; Fo - total surface of saturating mixture; then applying onto outer surfaces of parts cladding coating, namely MeCrAlY, where Me - Ni, Co, NiCo by ion-plasma process or electron beam evaporation in vacuum.
EFFECT: improved fire and corrosion resistance of coating, increased resource of blades of gas-turbine engine.
1 cl, 1 ex, 1 tbl
FIELD: metal coats, in particular for gas turbine engines operating at high temperature.
SUBSTANCE: claimed metal coat contains (mass %) cobalt up to 18; chromium 3.0-18; aluminum 5.0-15; yttrium 0.1-1.0; hafnium up to 0.6; silicium up to 0.3; tantalum 3/0-10; tungsten up to 9.0; rhenium 1.0-6.0, molybdenum up to 10, and balance - nickel. Method of invention includes providing of support from at least one metal materials based on nickel, cobalt or iron followed by application of coating layer.
EFFECT: coats of high oxidation resistance and endurance strength.
33 cl, 1 tbl
FIELD: metallurgy, namely processes for applying wear resistant chrome carbide coatings, protection of surface of articles of titanium and its alloys against action of aggressive media, abrasive wear and high temperature influence.
SUBSTANCE: method comprises steps of applying sub-layer of metal and further applying of wear resistant chrome carbide layer by pyrolysis of chrome-organic compounds of bis-arene. Before applying wear resistant layer of chrome carbide, sub-layer of nickel or its alloys with thickness 0.1 - 10 micrometers is applied.
EFFECT: possibility for applying on titanium and its alloys wear resistant coating with enhanced adhesion degree of coating and substrate and with improved strength against crumpling at elimination of cracking.
4 cl, 1 tbl, 4 ex
FIELD: corrosion prevention technologies.
SUBSTANCE: method includes serial application of layers of polymer compositions to metallic surface, while serial layers of polymer compositions are made with various thermal expansion coefficients. As said polymer composition polyurethane compound is used with special admixtures and filling agent, influencing thermal expansion coefficient of covering layer, and content of said filling agent in each following layer is set less than content of said filling agent in previous layer.
EFFECT: higher efficiency.
2 cl, 9 ex
FIELD: electrochemical technologies.
SUBSTANCE: method includes dipping zinc-covered article in chromium-containing solution, prior to dipping electrolytic application of zinc is performed onto previously cleaned surface of zinc-covered article with following washing and drying, and after chromatizing article is dried by hot air.
EFFECT: protective cover, resistant to corrosion effect in atmosphere, polluted with industrial gases, and to effect from external loads of direct and alternating character, to provide for higher reliability and durability of article.
FIELD: mechanical engineering; methods of formation of shaped pieces out of a sheet steel.
SUBSTANCE: the invention is pertaining to the field of mechanical engineering, in particular, to the methods of formation of shaped hardware products from sheet steel. The offered method provides for a chemical-thermal treatment of slab billet in depth from the side of a form-shaping surfaces and a profiling. At that thus before realization of the chemical-thermal treatment conduct cleansing of the whole surface of the slab billet, on one or both cleansed surfaces superimpose a drawing determining the form of the bent pieces and on the determined area apply a layer of stannum or eutectics Pb-Sn, coat the rest area of the slab billet with a hermitic varnish, and the chemical-thermal treatment conduct by aluminizing. In particular cases of realization of the invention the cleaning is conduct by working. The aluminizing is carried out for 3-5 minutes: on a clean surface apply a drawing using a metallic pencil; a layer of stannum or eutectics Pb-Sn apply by a galvanic method. The technical result of the invention is application of methods of chemical-thermal treatment, in particular, the aluminizing for production of bent-shaped pieces with a protective coating.
EFFECT: the invention offers methods of chemical-thermal treatment, in particular, the aluminizing for production of bent-shaped pieces with protective coatings.
5 cl, 3 dwg, 2 ex
FIELD: working of steel products, possibly restoration of worn surfaces of cylindrical articles such as cylinders of sucker rod depth pumps.
SUBSTANCE: method comprises steps of mechanical working, iron plating of inner surface of article, carburization, chrome plating and further heat treatment with isotermal soaking at temperature of obtaining large-flake pearlite.
EFFECT: restoration of geometry parameters of inner surface of worn cylindrical articles, enhanced strength and predetermined surface roughness of articles.
FIELD: methods of hardening of restored surfaces of steel products.
SUBSTANCE: the invention is pertaining to the field hardening of metallic surfaces of steel products. The offered method includes a cyanidation of the electrodeposited layer of an iron-molybdenum coating within 1-4 hours at the temperature of 600-650°C with usage of a paste of the following composition (in mass %): yellow bloody salt - 30...45, sodium carbonate - 8...10, calcium carbonate - 5...10, carbon-black - up to 57. The technical result of the invention is boosting hardness and a wearability of surfaces of steel component parts.
EFFECT: the invention ensures an increased hardness and a wearability of surfaces of steel component parts.
FIELD: methods of production of antiemission coatings.
SUBSTANCE: the offered invention is pertaining to formation of coatings and may be used for production of antiemission coating on grids of powerful oscillating tubes. The offered method includes formation of a layer of the tube grid material carbide, application of a layer of zirconium carbide from a metallic plasma of the vacuum-arc discharge at the temperature of the grid above 300°C, formation of shaping of a surface layer of platinum and an annealing. The technical result of the invention is development of a method of production of the intermetallic antiemission coatingPt3Zr having improved operational features.
EFFECT: the invention ensures production of the intermetallic antiemission coating with improved operational features.
1 tbl, 4 dwg