CN111705295B - Zinc-magnesium-aluminum zinc-impregnation agent, anti-corrosion metal part and zinc-impregnation method - Google Patents
Zinc-magnesium-aluminum zinc-impregnation agent, anti-corrosion metal part and zinc-impregnation method Download PDFInfo
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- CN111705295B CN111705295B CN202010796049.8A CN202010796049A CN111705295B CN 111705295 B CN111705295 B CN 111705295B CN 202010796049 A CN202010796049 A CN 202010796049A CN 111705295 B CN111705295 B CN 111705295B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
- C23C10/34—Embedding in a powder mixture, i.e. pack cementation
- C23C10/52—Embedding in a powder mixture, i.e. pack cementation more than one element being diffused in one step
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The application provides a zinc-magnesium-aluminum zinc-impregnation agent, an anti-corrosion metal part and a zinc-impregnation method. The zinc-magnesium-aluminum zinc-impregnation agent comprises the following components in parts by mass: 20-100 parts of metal powder, 40-80 parts of dispersing agent and 0.2-5 parts of decomposer, wherein the metal powder comprises 60-95 parts of zinc powder, 5-40 parts of magnesium powder and 1-3 parts of aluminum powder. The zinc-magnesium-aluminum zinc-impregnation agent provided by the application can realize the infiltration of magnesium and aluminum in the zinc impregnation process, and zinc and magnesium, aluminum and magnesium can form a zinc-magnesium alloy phase and an aluminum-magnesium alloy phase with high corrosion resistance, so that the corrosion resistance of an impregnation layer can be greatly improved, the attractiveness of a metal piece can be ensured, and different use requirements can be met.
Description
Technical Field
The application relates to the technical field of metal material surface chemical heat treatment, in particular to a zinc-magnesium-aluminum zinc-impregnation agent, an anti-corrosion metal part and a zinc-impregnation method.
Background
Zincification is a chemical heat treatment process that causes the surface of a metal material to infiltrate zinc. The surface of the metal material is subjected to zinc impregnation treatment, so that the atmospheric corrosion resistance of the metal material can be remarkably improved. Among them, powder zinc impregnation is widely used in corrosion prevention treatment of metal surfaces due to its advantages of no hydrogen embrittlement, high bonding strength, good corrosion resistance, etc. At present, most of global railway fasteners, high-strength fasteners and the like adopt a powder zinc-impregnation anti-corrosion treatment method for surface protection.
However, the existing powder zinc impregnation technology still has the problem of low corrosion resistance. The powder zinc-impregnation agent is adopted to carry out zinc impregnation on the metal piece, then a impregnation layer is formed on the metal piece, the impregnation layer formed by the powder zinc-impregnation agent on the market at present mainly comprises a zinc-iron alloy phase and a zinc phase, the crystal structure of zinc is an anisotropic close-packed hexagonal structure, and the lattice constant is represented by a and c. In the zinc impregnation process, zinc grows with orientation, and can preferentially grow along the direction of the c axis, and the self-diffusion coefficient of zinc is approximately 20 times that of zinc in the direction of the parallel c axis and the direction of the vertical c axis. The grain boundary between zinc crystals is a weak grain boundary structure in the growth process due to the anisotropism, and the weak grain boundary structure is transparent to corrosive substances such as chloride ions in the corrosion process, and the corrosive substances can directly penetrate through the grain boundary of zinc to enter the steel matrix, so that red rust spots can appear on the surface of a seeping layer quickly, and the time of the occurrence of red rust on the surface is generally judged to be the service life of salt spray corrosion resistance in the salt spray performance test. The common seepage layer has a salt spray resistant life of only tens of hours, and the salt spray resistant life of hundreds of hours or even thousands of hours in engineering can not be met. This requires surface sealing, dacromet coating and other treatments after powder zincification is completed to advance the overall corrosion resistance. However, most of the surface sealing and dacromet are organic or inorganic coatings, and under the conditions of sand blast, erosion and the like in the actual use environment, the sealing layer is easily worn away, and early corrosion often occurs, so that the metal part is early failed.
At present, the corrosion resistance of the zinc-doped layer is mainly improved by adding aluminum, nickel, rare earth and other methods, but in practical application, the methods are still limited in improving the corrosion resistance of the zinc-doped layer, and a patent named as a zinc-nickel-doped layer black metal corrosion prevention process discloses a component of the zinc-nickel-doped layer and a powder permeation process, wherein the nickel powder content is 0.5 to 1.4 weight percent, but when powder permeation treatment is carried out at the temperature of 500 ℃, nickel is difficult to permeate into the zinc-doped layer to form the zinc-doped layer, so that the corrosion resistance of the zinc-doped layer is difficult to form a high corrosion-resistant zinc-doped layer, and the corrosion resistance of the zinc-doped layer is basically equivalent to that of the zinc-doped layer obtained by traditional powder zinc permeation.
Magnesium has very active chemical property and can be combined with O 2 、N 2 、H 2 The reaction of a plurality of nonmetallic substances such as O and the like is difficult to grasp. Because of the special chemical property of magnesium, magnesium powder is rarely added into the zinc-impregnation agent in the prior art, even if the zinc-impregnation agent contains magnesium powder components, the magnesium powder does not depend on magnesium powder to play a main role, and the zinc-impregnation agent is usually matched with a plurality of other components. For example, the patent entitled "high activity, rapid permeation powder zinc-impregnation agent" discloses a high activity, rapid permeation powder zinc-impregnation agent in which aluminum and magnesium are added for the purpose of improving the activity of the impregnation agent to achieve the rapid permeation, and also for the purpose of improving the corrosion resistance of the impregnation layer. In addition, the particle size of magnesium powder added into the existing powder zinc-impregnation agent is generally below 10 mu m, and the content of the magnesium powder in the metal powder is often less than 5%. The aim of adding magnesium powder into the existing powder zinc-impregnation agent is to clean the surface of a metal part mostly through the high-temperature reaction of the magnesium powder, wherein the particle size and the content of the magnesium powder are enoughTo achieve the purpose thereof. However, magnesium powder having a particle size of less than 10 μm is liable to explode although it can act to clean the surface, is low in safety, and reacts to form gaseous compounds under high temperature conditions. In addition, in the case where the content of magnesium powder in the metal powder is less than 5%, it reacts almost entirely with the metal surface under high temperature conditions, resulting in no or very little penetration into the infiltrated layer.
In addition, if magnesium powder is added to the zincating agent, the color of the zinc-magnesium alloy phase formed is black due to the infiltration of magnesium, which results in the appearance of the final zincating layer being gray black and poor in aesthetic appearance.
Therefore, whether magnesium can be used in a zincating agent, whether magnesium can play a positive role in the zincating agent, and whether the addition of magnesium can bring an unexpected effect to the zincating agent is a difficult problem which has not been solved.
Disclosure of Invention
In view of the above, the embodiment of the application provides a zinc-magnesium-aluminum zinc-impregnation agent, an anti-corrosion metal piece and a zinc-impregnation method, so as to solve the technical defects in the prior art.
The application provides a zinc-magnesium-aluminum zinc-impregnation agent which comprises the following components in parts by weight: 20-100 parts of metal powder, 40-80 parts of dispersing agent and 0.2-5 parts of decomposer, wherein the metal powder comprises 60-95 parts of zinc powder, 5-40 parts of magnesium powder and 1-3 parts of aluminum powder.
Further, the zinc-magnesium-aluminum zinc-impregnation agent also comprises 0.5-3 parts of a first active agent capable of promoting magnesium to permeate into the impregnation layer and 0.1-2 parts of a second active agent capable of promoting aluminum to permeate into the impregnation layer, wherein the mass part of the second active agent is smaller than that of the first active agent;
preferably, the first active agent is a magnesium halide and the second active agent is an aluminum halide.
Further, the magnesium powder is pure magnesium powder or magnesium alloy powder;
preferably, the magnesium powder is pure magnesium powder with purity of more than 95 percent or magnesium alloy powder with weight ratio of magnesium not less than 40 percent.
Further, the dispersing agent is ceramic powder, and the decomposing agent is ammonium halide.
Preferably, the ceramic powder comprises at least one of alumina, silica, magnesia, aluminum nitride, silicon carbide;
more preferably, the ammonium halide comprises at least one of ammonium chloride, ammonium fluoride, ammonium iodide, ammonium bromide, and ammonium bifluoride.
Further, the particle size of the magnesium powder is 10-500 mu m, the particle size of the zinc powder is 1-200 mu m, and the particle size of the dispersing agent is 5-500 mu m.
Further, the zinc-magnesium-aluminum zinc-penetrating agent also comprises manganese dioxide, wherein the mass part of the manganese dioxide is not more than the mass part of the decomposing agent.
The application also provides an anti-corrosion metal piece, and the surface of the anti-corrosion metal piece is permeated with zinc, magnesium and aluminum through the zinc-magnesium-aluminum zincing agent to form a permeation layer capable of preventing the corrosion of the metal piece.
Further, the average content of magnesium in the seepage layer is 0.5-20wt%;
preferably, the thickness of the percolated layer is between 5 μm and 200 μm.
The application also provides a zincating method, which comprises the following steps:
s1, carrying out oil and rust removal treatment on a metal piece to be galvanized, and placing the treated metal piece and the zinc-magnesium-aluminum zincification agent in a closed infiltration tank together;
s2, driving air in the closed infiltration tank, and closing a valve of the closed infiltration tank;
s3, heating the closed infiltration tank, and preserving heat for 1-10 hours after heating to a preset temperature to finish the zinc infiltration.
Further, in step S2, the sealed infiltration tank is vacuumized, or protective atmosphere is introduced into the sealed infiltration tank to expel air in the sealed infiltration tank, and a valve of the sealed infiltration tank is closed.
In the step S3, the closed infiltration tank is subjected to heating treatment, and the temperature is kept for 1 to 10 hours under the condition of heating to 360 to 415 ℃ or 320 to 480 ℃ to finish the zinc infiltration.
The zinc-magnesium-aluminum zinc-impregnation agent provided by the application comprises metal powder, a dispersing agent and a decomposing agent, wherein the metal powder comprises zinc powder, magnesium powder and aluminum powder, and has the following technical effects:
on the one hand, due to the anisotropy of zinc, the grain boundaries between zinc crystals are weak grain boundary structures in the growth process, the weak grain boundary structures are transparent to corrosive substances such as chloride ions, the corrosive substances can directly pass through the weak grain boundary structures to corrode, and magnesium can be gathered at the weak grain boundary structures of zinc to form MgZn through high-temperature reaction 2 、Mg 2 Zn 11 And the zinc-magnesium alloy phase with high corrosion resistance promotes the transformation of a weak grain boundary structure into a strong grain boundary structure capable of effectively blocking corrosive substances such as chloride ions, thereby greatly improving the corrosion resistance of a seepage layer.
On the other hand, although the corrosion resistance of the seepage layer can be improved by adding magnesium powder into the zinc impregnation agent, the magnesium powder and zinc magnesium alloy phase formed by zinc are black, the appearance is extremely unaesthetic, and the problem can be just solved by adding aluminum. Under the condition that magnesium powder and aluminum powder are added into the zinc-magnesium-aluminum zinc-impregnation agent, magnesium firstly reacts with aluminum in the impregnation layer to form a white aluminum-magnesium alloy phase, so that the appearance of the impregnation layer is changed from black into silver gray, the aesthetic property is greatly improved, and different use requirements can be better met.
More importantly, the aluminum-magnesium alloy phase formed by the reaction of aluminum and magnesium also has extremely high corrosion resistance, the aluminum-magnesium alloy phase formed by the reaction in the seepage layer and the zinc-magnesium alloy phase are interwoven together to construct a compact corrosion-resistant protective barrier, and the corrosion resistance of the seepage layer is greatly improved.
The magnesium powder is 5-40 parts by weight, so that the average content of magnesium in the seepage layer is 0.5-20wt% to ensure that the corrosion resistance of the seepage layer can be improved to the maximum extent. A large number of experiments prove that under the condition that the magnesium content in the seepage layer is less than 0.5 weight percent, namely the mass part of magnesium powder is less than 5 parts, magnesium mainly reacts with oxygen in oxygen-containing substances and cannot enter the seepage layer, and under the condition that the magnesium content in the seepage layer is more than 20 weight percent, namely the mass part of magnesium powder is more than 40 parts, the magnesium content in the seepage layer is higher, so that the formed magnesium alloy is more relatively high, and the corrosion resistance of the seepage layer is obviously reduced due to the fact that the magnesium alloy is extremely corrosion-resistant. Compared with the common seepage layer, the seepage layer containing 0.5-20wt% of magnesium has the advantages that the neutral salt fog resistant life can be improved by tens of times, and the seepage layer has extremely high engineering application value and application prospect.
In addition, the zinc-magnesium-aluminum zinc-impregnation agent provided by the application can further comprise a first active agent and a second active agent, wherein the first active agent is preferably magnesium halide, the second active agent is preferably aluminum halide, the magnesium halide can promote interaction between magnesium and zinc, can promote aggregation of magnesium at zinc crystal boundaries, further improves corrosion resistance of an impregnation layer, and the aluminum halide can accelerate infiltration of aluminum and further improves quality of the impregnation layer.
The surface of the anti-corrosion metal piece is permeated with zinc, magnesium and aluminum through the zinc-magnesium-aluminum zinc permeation agent to form a permeation layer which can prevent the metal piece from corrosion and is attractive and practical, and the magnesium and the zinc interact to form MgZn 2 、Mg 2 Zn 11 The zinc-magnesium alloy phase with high corrosion resistance is formed by the interaction of magnesium and aluminum, the aluminum-magnesium alloy phase with attractive appearance and high corrosion resistance is formed, a solid protective barrier is constructed for the metal piece, corrosion of corrosive substances such as chloride ions and the like to the metal piece is prevented, the corrosion resistance of the metal piece is effectively improved, the service life of the metal piece is prolonged, the appearance of a seepage layer is beautified, the cost is low, and the popularization and the use are easy.
According to the zincification method provided by the application, by driving the air in the airtight permeation tank, the reaction of magnesium in the zinc-magnesium-aluminum zincification agent and the air can be effectively avoided, and by heating the airtight permeation tank, the air in the airtight permeation tank can be further driven, meanwhile, the proper environment condition for completing the zincification of the metal part is created, and the heat is preserved for 1-10 hours after the temperature is raised to the preset temperature, so that the zincification effect is good, and the zincification quality is high. The zincification method provided by the application is simple to operate, convenient to use, low in cost, high in economic benefit and wide in application range.
Drawings
FIG. 1 is a comparative view of the appearance of a metal part according to an embodiment of the present application;
FIG. 2 is a cross-sectional view of a metal piece infiltrated layer salt spray for 1000 hours according to an embodiment of the present application;
FIG. 3 is a cross-sectional view of a metal piece of an embodiment of the present application showing a salt spray 2000 hours;
FIG. 4 is a 4000 hour cross-sectional view of a metal piece infiltrated layer salt spray according to an embodiment of the present application;
FIGS. 5a and 5b are graphs comparing salt spray test results of an embodiment of the present application;
FIG. 6 is an electronic image of the surface of a metal part infiltrated layer in accordance with one embodiment of the present application;
FIG. 7 is a chart showing the elemental content of a infiltrated layer of a metal part according to an embodiment of the present application;
FIG. 8 is a cross-sectional view of a metal part infiltration layer according to an embodiment of the present application;
FIG. 9 is a graph of analysis of the spectral composition of a infiltrated layer of a metal part according to an embodiment of the present application.
Detailed Description
The following describes specific embodiments of the present application with reference to the drawings.
In the present application, unless otherwise indicated, scientific and technical terms used herein have the meanings commonly understood by one of ordinary skill in the art. Also, reagents, materials, and procedures used herein are reagents, materials, and conventional procedures widely used in the corresponding field.
Example 1
The embodiment provides a zinc-magnesium-aluminum zinc-impregnation agent, which comprises the following components in parts by mass: 20-100 parts of metal powder, 40-80 parts of dispersing agent and 0.2-5 parts of decomposer, wherein the metal powder comprises 60-95 parts of zinc powder, 5-40 parts of magnesium powder and 1-3 parts of aluminum powder.
On the one hand, the atomic radius of zinc is 0.1332 nanometers, the atomic radius of magnesium is 0.1598 nanometers, the difference of the atomic radii of the zinc and the magnesium is less than 15 percent, and meanwhile, the magnesium and the zinc are in close-packed hexagonal structures, so that the magnesium and the zinc can jointly act to form a seepage layer. Although magnesium itself is not corrosion-resistant, it can occupy part of the zinc atom sites in the zinc crystal structure, especially at the grain boundaries, where a certain amount of magnesium can accumulate in zincAnd forms MgZn by high temperature reaction at the weak crystal boundary 2 、Mg 2 Zn 11 Equal zinc magnesium alloy phase, mgZn 2 、Mg 2 Zn 11 The isoalloy phase itself is a highly corrosion-resistant phase, and the formation of the grain boundaries promotes the change of the original weak grain boundary structure to the strong grain boundary structure, and in particular, the strong grain boundary structure is opaque to corrosive substances such as chloride ions, and can block the corrosive substances from the outside. At the same time, mgZn 2 、Mg 2 Zn 11 In the corrosion process of the zinc-magnesium alloy phase, the corrosion product is changed from a loose structure of common powder zinc impregnation into a compact structure, so that the corrosion resistance of the metal piece is greatly improved, and the service life of the metal piece is greatly prolonged.
Although the addition of magnesium can improve the corrosion resistance of the seepage layer, the zinc-magnesium alloy phase formed by magnesium and zinc is black, the appearance is extremely unaesthetic, and the addition of aluminum can just solve the problem. The zinc in the zinc-magnesium-aluminum zinc-impregnation agent firstly reacts with the aluminum in the impregnation layer to form a white aluminum-magnesium alloy phase, so that the appearance of the impregnation layer is changed from black into silver gray, the aesthetic property is greatly improved, and different use requirements can be better met.
Referring to fig. 1, fig. 1 is a comparative view of the appearance of two metal pieces, wherein the metal piece at the upper part is treated by the zinc-magnesium-aluminum zinc-impregnation agent provided in this embodiment to form a impregnation layer, and the metal piece at the lower part is treated by the zinc-magnesium-free zinc-impregnation agent containing only zinc and magnesium to form the impregnation layer, so that the addition of a proper amount of aluminum to the zinc-impregnation agent can significantly improve the appearance of the impregnation layer of the metal piece and enhance the aesthetic property of the impregnation layer.
More importantly, the aluminum-magnesium alloy phase formed by the reaction of aluminum and magnesium also has extremely high corrosion resistance, the aluminum-magnesium alloy phase formed by the reaction in the seepage layer and the zinc-magnesium alloy phase are interwoven together to construct a compact corrosion-resistant protective barrier, and the corrosion resistance of the seepage layer is greatly improved.
On the other hand, the 5-40 parts by weight of magnesium powder in the zinc-magnesium-aluminum zinc-impregnation agent can ensure that 0.5-20wt% of magnesium can be dissolved in the impregnation layer, thereby promoting the formation of MgZn with high corrosion resistance 2 、Mg 2 Zn 11 Equal-height corrosion-resistant alloy phase, thereby being extremely largeThe corrosion-resistant life of the metal piece is improved. Because magnesium itself is extremely reactive, it generally will react preferentially with oxygen in oxygen-containing species, such as air oxygen, iron oxides, zinc oxides, and the like, and once a certain level of oxide is formed on the magnesium surface, it is difficult for magnesium to re-diffuse into the metal body. Compared with a permeation layer formed by a common zinc-magnesium-aluminum zinc-permeation agent, the permeation layer containing 0.5-20wt% of magnesium has the advantages that the neutral salt fog resistant life can be improved by tens of times, and the engineering application value and the application prospect are extremely high.
If the magnesium content is too low, it will react mainly with oxygen in the oxygen-containing species and will not be able to enter the percolated layer. Since magnesium cannot react directly with metal (such as iron), only zinc diffuses into the metal part at the initial stage of the reaction, and when the concentration of zinc in the cementite reaches a certain level, magnesium diffuses into zinc, thereby forming a zinciferous layer containing magnesium. Particularly, when the content of magnesium in the zinc-magnesium-aluminum zinc-impregnation agent is less than 2wt%, magnesium does not directly permeate into the metal piece in the initial stage of the reaction, and the magnesium reacts with the oxide film on the surface of the metal piece and the oxide film on the surface of zinc to improve the reactivity. When the zinc content in the infiltrated layer reaches the condition that magnesium can infiltrate, the magnesium content is too small and is almost completely consumed by the initial reaction, so that enough active magnesium atoms cannot be provided and cannot infiltrate into the infiltrated layer. If the magnesium content is too high, the formed magnesium alloy is too much, the corrosion resistance of the seepage layer is reduced due to the fact that the magnesium alloy is not corrosion-resistant, and the explosion is easily caused due to the fact that the magnesium activity is extremely strong and the safety is low.
In addition, the magnesium powder may be pure magnesium powder with purity of more than 95%, or magnesium alloy powder with weight ratio of magnesium not less than 40% to provide enough magnesium atom penetration into the infiltrated layer.
In this embodiment, the metal powder may be 20 parts by mass, 25 parts by mass, 30 parts by mass, 35 parts by mass, 40 parts by mass, 45 parts by mass, 50 parts by mass, 55 parts by mass, 60 parts by mass, 65 parts by mass, 70 parts by mass, 75 parts by mass, 80 parts by mass, 85 parts by mass, 90 parts by mass, 95 parts by mass, 100 parts by mass, and the like, preferably 40 to 80 parts by mass, more preferably 50 to 70 parts by mass, 60 parts by mass, 65 parts by mass, 70 parts by mass, 75 parts by mass, 80 parts by mass, 85 parts by mass, 90 parts by mass, 95 parts by mass, and the like, preferably 70 to 90 parts by mass, more preferably 75 to 85 parts by mass, and the magnesium powder may be 5 parts by mass, 10 parts by mass, 15 parts by mass, 20 parts by mass, 25 parts by mass, 30 parts by mass, 35 parts by mass, 40 parts by mass, and the like, preferably 8 to 38 parts by mass, more preferably 10 to 35 parts by mass, and the aluminum powder may be 1 to 3 parts by mass, 1 part by mass, 1.5 parts by mass, 2.5 parts by mass, 3 parts by mass, and the present application may be as appropriate.
It should be noted that, in the existing zinc-containing magnesium-aluminum component zinc-containing agent, the content of aluminum is often greater than that of magnesium so as to achieve the purposes of improving the activity of the zinc-containing agent, improving the seepage speed and the like, while in the zinc-magnesium-aluminum zinc-containing agent provided by the application, the content of magnesium is obviously greater than that of aluminum, so that after the magnesium is reacted with aluminum, enough magnesium still can react with zinc to form a zinc-magnesium alloy phase with high corrosion resistance, and the purposes of improving the corrosion resistance of a seepage layer and prolonging the service life are achieved.
The particle size of the zinc powder is preferably 1 μm to 200. Mu.m, and may be 1 μm, 10 μm, 30 μm, 50 μm, 100 μm, 150 μm, 200 μm, etc., and the particle size of the magnesium powder is preferably 10 μm to 500. Mu.m, and may be 1 μm, 10 μm, 30 μm, 50 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, etc. If the particle size of the magnesium powder is less than 10 μm, the magnesium powder is extremely easy to explode and has extremely low safety, and if the particle size of the magnesium powder is more than 500 μm, the activity and the seepage speed of the magnesium powder can be rapidly reduced, so the particle size of the magnesium powder is not arbitrarily limited, and the effect is most stable only if the particle size is in the range of 10 μm to 500 μm.
Specifically, the dispersant is preferably a ceramic powder including at least one of alumina, silica, magnesia, aluminum nitride, silicon nitride, and silicon carbide. Ceramic powder is added into the zinc-magnesium-aluminum zinc-impregnation agent provided by the embodiment, so that the metal powder can be effectively prevented from being bonded.
In this embodiment, the particle diameter of the dispersant is preferably 5 μm to 500. Mu.m, specifically 5 μm, 10 μm, 50 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, etc., and the mass fraction of the dispersant may be 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, etc., as the case may be, and the application is not limited thereto.
Specifically, the decomposing agent is preferably an ammonia halide including at least one of ammonium chloride, ammonium fluoride, ammonium iodide, ammonium bromide, and ammonium bifluoride, and preferably ammonium chloride. Under the temperature condition of powder zincating, the ammonia halide can be decomposed to provide ammonia and hydrogen halide gas, so that the effect of cleaning the surface of a metal piece can be achieved, and the hydrogen halide can be used for activating other components to promote the zincating. The mass part of the decomposer can be 0.2 part, 0.5 part, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts and the like.
The analysis of the metal piece cementation layer obtained after the zincification treatment by using the zinc-magnesium-aluminum cementation agent provided by the embodiment is carried out, and is shown in figures 2-4. Fig. 2 is a sectional view of a metal part after 1000 hours of salt fog, fig. 3 is a sectional view of a metal part after 2000 hours of salt fog, and fig. 4 is a sectional view of a metal part after 4000 hours of salt fog, and it can be obviously seen that the zinc-magnesium-aluminum zinc-impregnation agent provided by the embodiment is adopted to carry out zinc impregnation treatment on a metal part, and the addition of magnesium powder and aluminum powder can effectively improve the salt fog resistance and corrosion resistance of the metal part, so that the salt fog service life of the metal part can be greatly prolonged.
In summary, the zinc-magnesium-aluminum zinc impregnation agent provided by the embodiment comprises metal powder, a dispersing agent and a decomposing agent, wherein the metal powder comprises zinc powder, magnesium powder and aluminum powder, so that infiltration of magnesium and aluminum can be realized in the zinc impregnation process, zinc and magnesium can form a zinc-magnesium alloy phase with high corrosion resistance, aluminum and magnesium can form an aluminum-magnesium alloy phase with attractive appearance and corrosion resistance, the corrosion resistance of a seepage layer can be greatly improved, the attractive appearance of a metal piece can be ensured, and different use requirements can be met.
Example 2
On the basis of embodiment 1, this embodiment provides a zinc-magnesium-aluminum zinc-impregnation agent further comprising 0.5 to 3 parts, such as 0.5 part, 1 part, 1.5 part, 2 parts, 2.5 parts, 3 parts, etc., of a first active agent capable of promoting magnesium penetration into the impregnation layer, and 0.1 to 2 parts, such as 0.2 part, 0.4 part, 0.6 part, 0.8 part, 1 part, 1.2 part, 1.5 part, 1.8 part, etc., of a second active agent capable of promoting aluminum penetration into the body side, which the present application is not limited to.
Specifically, the first active agent is preferably magnesium halide including at least one of magnesium chloride, magnesium fluoride, magnesium iodide, and magnesium bromide, and the second active agent is preferably aluminum halide including at least one of aluminum chloride, aluminum fluoride, aluminum iodide, and aluminum bromide, and more preferably aluminum fluoride.
In the powder zincating process, the magnesium halide is always solid, and can fully contact with the surface of a metal piece and the permeation layer for reaction, so that the permeation of the magnesium is easier to realize, and the magnesium halide is further added as an activating agent, so that the magnesium can be promoted to quickly and effectively permeate into the permeation layer, the interaction between the magnesium and the zinc can be promoted, the aggregation of the magnesium at the zinc grain boundary can be promoted, and the corrosion resistance of the permeation layer can be further effectively improved. Although ammonium halides such as ammonium chloride and ammonium fluoride also have an activating and catalyzing effect, they do not have a strong activating and catalyzing effect on magnesium. Taking ammonium chloride as an example, the ammonium chloride is heated and decomposed to generate ammonia and hydrogen chloride gas, and most of active magnesium atoms generated by the reaction of magnesium and gaseous hydrogen chloride cannot be attached to the surface of a seepage layer to react with the seepage layer.
Similarly, aluminum halide is solid, and can fully contact with the surface of the metal piece and the infiltration layer for reaction, so that infiltration of aluminum is easier to realize, reaction of aluminum and magnesium can be promoted, an aluminum-magnesium alloy phase is accelerated to form, corrosion resistance of the infiltration layer is further improved, and appearance of the infiltration layer of the metal piece is improved.
In summary, the zinc-magnesium-aluminum zinc-impregnation agent provided in this embodiment includes metal powder, a dispersant, a decomposer, a first activator and a second activator, where the metal powder includes zinc powder, magnesium powder and aluminum powder, so that the infiltration of magnesium can be realized in the zinc impregnation process, zinc and magnesium can form a zinc-magnesium alloy phase with high corrosion resistance, so that the corrosion resistance of a seeping layer can be greatly improved, aluminum and magnesium can form an aluminum-magnesium alloy phase with attractive appearance and corrosion resistance, and the addition of the first activator and the second activator can further promote the infiltration of magnesium powder into the seeping layer, further accelerate the reaction among zinc, magnesium and aluminum, and further improve the performance of the zinc-magnesium-aluminum zinc-impregnation agent.
Example 3
On the basis of embodiment 1 or 2, this embodiment provides a zinc-magnesium-aluminum zinc-impregnation agent, which further includes manganese dioxide, wherein the mass part of manganese dioxide is not greater than the mass part of the decomposer, specifically, the mass part of manganese dioxide may be 0-3 parts, such as 0.01 part, 0.05 part, 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 1 part, 1.5 part, 2 parts, 2.5 parts, 3 parts, and the like, and the application is not limited thereto as the case may be.
In practice, manganese dioxide is added to the zinc magnesium aluminum zincating agent as an infiltration reaction catalyst for magnesium which promotes diffusion of magnesium into the infiltrated layer by reacting with an ammonia halide as a decomposer. Firstly, ammonia halide is decomposed at high temperature to obtain ammonia and hydrogen halide gas, then the hydrogen halide gas reacts with manganese dioxide to obtain manganese halide, chlorine and other gases, the chlorine and other gases can provide a large amount of active ions, the active ions react with magnesium to generate active anhydrous magnesium halide gas, and finally the active anhydrous magnesium halide gas can exchange with zinc in a cementation layer, so that magnesium diffuses into the zincification layer.
Taking ammonium chloride as an example, under the condition of 350 ℃, the ammonium chloride starts to decompose to generate ammonia and hydrogen chloride, the hydrogen chloride reacts with manganese dioxide to generate manganese chloride and chlorine, the chlorine can provide a large amount of active chloride ions on the surface of the seepage layer, the active chloride ions react with magnesium to generate active anhydrous magnesium chloride gas, and the active anhydrous magnesium chloride gas can react with zinc in the seepage layer in a replacement manner, so that the diffusion of magnesium into the seepage layer is promoted.
Particularly, under the condition that the zinc-magnesium-aluminum zincating agent also comprises a magnesium halide active agent, the solid magnesium halide can generate double catalytic action with gaseous magnesium halide to promote the magnesium to continuously infiltrate into the zincating layer, so that the zincating layer can contain enough magnesium and react with zinc to form a zinc-magnesium alloy phase with high corrosion resistance, and the corrosion resistance of the zincating layer is improved.
Example 4
The present embodiment provides an anti-corrosion metal part, the surface of which is impregnated with zinc and magnesium by the zincification agent according to any one of embodiments 1 to 3 to form a penetration layer capable of preventing corrosion of the metal part.
The metal piece with the cleaned surface and zinc-magnesium-aluminum zinc-penetrating agent are put into a sealed container, heated to below the melting point of zinc (419.4 ℃), kept warm for a certain time, and cooled to room temperature along with a furnace, so that a penetrating layer capable of preventing corrosion of the metal piece is formed on the surface of the metal piece.
The average content of magnesium in the seeping layer is between 0.5wt% and 20wt%, such as 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, 10wt%, 11wt%, 12wt%, 13wt%, 14wt%, 15wt%, 16wt%, 17wt%, 18wt%, 19wt%, etc. to ensure that the corrosion resistance of the seeping layer can be improved to the maximum extent. A large number of experiments prove that under the condition that the magnesium content in the seepage layer is less than 0.5 weight percent, namely, the magnesium is less than 5 parts by weight, magnesium mainly reacts with oxygen in oxygen-containing substances and cannot enter the seepage layer, under the condition that the magnesium content in the seepage layer is more than 12 weight percent, namely, the magnesium is more than 40 parts by weight, the magnesium content in the seepage layer is higher, the formed magnesium alloy is more similar, and the corrosion resistance of the seepage layer is obviously reduced due to the fact that the magnesium alloy is extremely non-corrosion resistant. Compared with the common seepage layer, the seepage layer containing 0.5-20wt% of magnesium has the advantages that the neutral salt fog resistant life can be improved by tens of times, and the seepage layer has extremely high engineering application value and application prospect.
The thickness of the permeation layer is preferably 20 to 100 μm, which may be specifically 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, etc., as appropriate, and the present application is not limited thereto.
Wherein the content of magnesium in the seepage layer decreases with the increase of the depth of the seepage layer, and the content of magnesium is more at the shallower position in the seepage layer and is less at the deeper position in the seepage layer.
In addition, it should be noted that the surface magnesium content of the infiltrated layer may be greater than 20%, which is due to the higher surface magnesium content of the infiltrated layer caused by the excessive adhesion of magnesium powder to the infiltrated layer surface. But only the partOnly appear on the surface layer of the seepage layer, the surface layer of the seepage layer with high magnesium content is corroded quickly along with the corrosion, and then the seepage layer with the magnesium content of 0.5 to 20 weight percent, which can prevent the metal piece from being corroded, is exposed, in the seepage layer, magnesium can be gathered at the weak grain boundary of zinc and form MgZn through high temperature reaction 2 、Mg 2 Zn 11 Equal zinc magnesium alloy phase, mgZn 2 、Mg 2 Zn 11 The isoalloy phase itself is a highly corrosion-resistant phase, and the formation of the grain boundaries promotes the change of the original weak grain boundary structure to the strong grain boundary structure, and in particular, the strong grain boundary structure is opaque to corrosive substances such as chloride ions, and can block the corrosive substances from the outside. At the same time, mgZn 2 、Mg 2 Zn 11 In the corrosion process of the zinc-magnesium alloy phase, the corrosion product is changed from a loose structure of common powder zinc impregnation into a compact structure, so that the corrosion resistance of the metal piece is greatly improved, and the service life of the metal piece is greatly prolonged.
Example 5
The embodiment provides a zincating method, which comprises the steps of S1 to S3.
S1, carrying out oil and rust removal treatment on a metal piece to be galvanized, and placing the treated metal piece and the zinc-magnesium-aluminum zinc-leaching agent in the embodiment 1 or 2 in a closed infiltration tank.
S2, driving air in the airtight infiltration tank, and closing a valve of the airtight infiltration tank.
In practical application, the sealed infiltration tank can be vacuumized, or protective atmosphere is introduced into the sealed infiltration tank to expel air in the sealed infiltration tank, and a valve of the sealed infiltration tank is closed. The protective atmosphere is preferably an inert gas.
S3, heating the closed infiltration tank, and preserving heat for 1-10 hours after heating to a preset temperature to finish the zinc infiltration.
In practical application, the closed infiltration tank can be subjected to heating treatment, and the temperature is kept for 1-10 hours, such as 2 hours, 4 hours, 6 hours, 8 hours and the like, when the temperature is raised to 360-415 ℃ or 320-480 ℃, so that the zinc infiltration can be completed. Wherein, in the case that the zinc-magnesium-aluminum zinc-impregnation agent is a static powder, the preset temperature is preferably 360-415 ℃, such as 360 ℃, 370 ℃, 380 ℃, 390 ℃, 400 ℃, 410 ℃, 415 ℃, etc., and in the case that the zinc-magnesium-aluminum zinc-impregnation agent is a dynamic powder, the preset temperature is preferably 320-480 ℃, such as 320 ℃, 340 ℃, 360 ℃, 380 ℃, 400 ℃, 420 ℃, 440 ℃, 460 ℃, 480 ℃, etc.
According to the zincification method provided by the embodiment, by driving the air in the airtight permeation tank, the reaction of magnesium in the zinc-magnesium-aluminum zincification agent and the air can be effectively avoided, by heating the airtight permeation tank, the air in the airtight permeation tank can be further driven, meanwhile, the proper environment condition for completing the zincification of the metal piece is also created, the heat is preserved for 1-10 hours after the temperature is raised to the preset temperature, the zincification effect is good, and the quality of the zincification layer is high. The zincification method provided by the application is simple to operate, convenient to use, low in cost, high in economic benefit and wide in application range.
Example 6
The zinc-magnesium-aluminum zinc-impregnation agent and the zinc-impregnation method provided by the application bring remarkable improvement to various aspects of application, and are specifically described by taking lightning protection, railway fasteners and high-strength fasteners as examples.
Firstly, in the aspect of lightning protection, the corrosion prevention mode adopted by the current lightning protection is generally copper electroplating, on one hand, the copper electroplating cost is very high, and on the other hand, copper is easy to corrode in environments such as alkaline soil and the like, so that the grounding part is easy to corrode in advance and fail, and meanwhile, heavy metal pollution is caused to the environments such as soil, water sources and the like. At present, the corrosion resistance of products such as pure electrogalvanizing, hot galvanizing and powder electrogalvanizing cannot meet the grounding standard requirements, and sealing and other treatments are needed to meet the corrosion resistance requirements, but once sealing and other treatments are carried out, the conductivity of a grounding piece is obviously reduced, and the conductivity requirement of lightning protection grounding cannot be met.
The zinc-magnesium-aluminum zinc-impregnation agent and the zinc-impregnation method can perfectly solve the problems. Because the magnesium powder and the aluminum powder are added into the zinc-magnesium-aluminum zinc-impregnation agent, the corrosion resistance after zinc impregnation is greatly improved, the standard requirements can be met without sealing and the like for treating the corrosion resistance and the service life, and the ecological environment is not polluted by zinc and magnesium. Meanwhile, the total cost of the zinc-magnesium-aluminum zinc-impregnation agent and the zinc-impregnation method provided by the application is less than five kiloyuan/ton, and the overall cost of the lightning protection power connection industry can be greatly reduced.
Secondly, in the aspect of railway fasteners, at present, the railway fasteners are generally processed by adopting a powder zinc impregnation and sealing processing method, but in a high vibration service environment of a railway, the actual service life is far less than the design requirement, the actual service life often does not reach half of the design service life, and the railway fasteners are replaced integrally.
By adopting the zinc-magnesium-aluminum zinc-impregnation agent and the zinc-impregnation method provided by the application, the corrosion resistance of the railway fastener can be greatly improved by realizing the impregnation of a proper amount of magnesium and aluminum in the impregnation layer of the railway fastener, the service life of the railway fastener is greatly prolonged, and the high standard requirements of special scenes such as subways can be completely met.
The zinc-magnesium-aluminum zinc-impregnation agent and the zinc-impregnation method provided by the application can completely realize the preparation of the zinc-impregnation layer of the metal piece with high corrosion resistance for the railway, the neutral salt fog resistant life of the metal piece after zinc impregnation can reach more than 1500 hours, and meanwhile, the subsequent coating treatments such as sealing, dacromet and the like can be omitted, so that the process is simplified, and the performance of the metal piece is greatly improved.
Thirdly, in the aspect of high-strength fasteners, taking the wind power industry as an example, wind power bolts in the wind power industry are high-strength fasteners, most of the currently adopted methods are powder zinc impregnation and sealing or Dacromet, and follow-up maintenance is basically performed by brushing paint. Wind power bolts are difficult to replace once installed, and can cause great property loss and even casualties once broken and failed due to corrosion problems.
The zinc-magnesium-aluminum zinc-impregnation agent and the zinc impregnation method provided by the application can not cause the problems. And introducing magnesium element and aluminum element into the seepage layer, and forming zinc-magnesium alloy phase and equal corrosion-resistant alloy phase of aluminum-magnesium alloy in the thermal diffusion process. In the corrosion process of the seeping layer, the magnesium-zinc alloy phase and the aluminum-magnesium alloy phase can promote the generation of compact and insoluble corrosion products; at the same time, mgZn 2 The structure of the alloy structure is compact, and the corrosion rate is effectively reduced. After the surface of the seepage layer is scratched, a compact compound layer can be quickly formed at the damaged part to prevent corrosion from further happening, so that the self-repairing type fastener has a self-repairing function and can be perfectly suitable for high-strength fasteners.
Example 7
In this example, test groups and control groups were set, and the components of the zincification agent in each group are shown in Table 1.
Table 1 schematic Table of the composition of each group of Zinc-magnesium-aluminum zinc-impregnation agent
The metal pieces were subjected to a zincating treatment using the zincating agent of the test group and the control group and the zincating method described in example 5, and salt spray tests were performed, and the results are shown in table 2, fig. 5a, fig. 5 b.
Table 2 comparison table of salt spray test results for test group and control group
Under the condition of containing zinc powder and aluminum powder, the corrosion resistance of the seepage layer is the worst, and the corrosion resistance is basically equivalent to that of pure zinc seepage. Under the condition that the zinc powder and the magnesium powder are contained in the zincating agent in the test group 2, the corrosion resistance of the seepage layer is obviously improved, a certain amount of aluminum is added in the test group 3 on the basis of the test group 2, and the corrosion resistance of the test group is basically equivalent to that of the test group 2 without aluminum. Meanwhile, the neutral salt spray corrosion resistance time of the test group 2 and the test group 3 is 500 hours.
Both test group 4 and test group 5 were supplemented with magnesium fluoride catalyst, and in addition test group 5 was supplemented with aluminum fluoride catalyst. The neutral salt spray corrosion resistance time of the test group 4 and the test group 5 reaches 2000 hours, which shows that the magnesium halide is added to promote the infiltration of magnesium, thereby improving the corrosion resistance. Meanwhile, the test group 5 is added with aluminum halide as an aluminum permeation promoter, so that the appearance quality of the workpiece can be improved. In fig. 1, the 11-10-A sample is a sample corresponding to the test group 5, the 11-10-B sample is a sample corresponding to the test group 4, and although the neutral salt spray corrosion resistance time of the sample and the sample is equivalent, the appearance of the sample 11-10-A added with aluminum is silver gray, which is obviously superior to the gray-black appearance of the sample 11-10-B without aluminum, and the attractive demand can be met.
Test group 6 an electron image of the surface of the infiltrated layer of the metal part of test group 6 observed under a microscope was shown in fig. 6, and the part in the box was subjected to a spectrogram analysis, and the result is shown in fig. 7, wherein in the infiltrated layer of the metal part of test group 6, the zinc content was 36.8wt%, the magnesium content was 19.4wt% and the aluminum content was 4.3wt%. Immediately after the start of the test, the cross section of the infiltrated layer of the metal part of test group 6 was shown in fig. 8, and the portion in the box of fig. 8 was analyzed for energy spectrum components, the result was shown in fig. 9, and the result was shown in table 3.
Table 3 Table 6 Metal piece infiltrated layer eZAF quantitative analysis results Table
| Element(s) | Weight percent | Atom% | Net strength of | Net intensity error |
| MgK | 4.47 | 10.67 | 51.48 | 0.05 |
| AlK | 2.52 | 5.41 | 42.14 | 0.07 |
| FeK | 8.88 | 9.23 | 172.7 | 0.03 |
| ZnK | 84.13 | 74.69 | 667.39 | 0.01 |
The addition of manganese dioxide in test group 6 promotes a synergistic infiltration effect of magnesium and aluminum, further improving corrosion resistance. The neutral salt spray corrosion resistance time is rapidly increased from 2000 hours to 4000 hours, the existing zinc corrosion resistance can be increased to a new height, a great deal of economic loss and casualties caused by corrosion problems are effectively reduced, and the corrosion protection method has extremely high engineering application value for corrosion protection of steel products.
Therefore, the zinc-magnesium-aluminum zinc-impregnation agent provided by the application is creatively added with magnesium powder and aluminum powder, so that the corrosion resistance of the impregnation layer can be obviously improved, the appearance of the impregnation layer of a metal piece can be effectively improved, the components such as the metal powder, the decomposer, the dispersing agent and the activating agent interact and supplement each other, an attractive and firm impregnation layer protection barrier is constructed for the metal piece, and the service life of the metal piece is greatly prolonged.
In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used merely to indicate relative positional relationships between the relevant portions, and do not limit the absolute positions of the relevant portions.
Herein, "first", "second", etc. are used only for distinguishing one another, and do not denote any order or importance, but rather denote a prerequisite of presence.
Herein, "equal," "same," etc. are not strictly mathematical and/or geometric limitations, but also include deviations that may be appreciated by those skilled in the art and allowed by fabrication or use, etc.
Unless otherwise indicated, numerical ranges herein include not only the entire range within both of its endpoints, but also the several sub-ranges contained therein.
While the preferred embodiments and examples of the present application have been described in detail with reference to the accompanying drawings, the present application is not limited to the above-described embodiments and examples, and various changes may be made within the knowledge of those skilled in the art without departing from the spirit of the present application.
Claims (10)
1. The zinc-magnesium-aluminum zinc-impregnation agent is characterized by comprising the following components in parts by weight: 50 parts of dispersing agent, 1 part of decomposer, 40 parts of zinc powder, 10 parts of magnesium powder and 2 parts of aluminum powder;
the zinc-magnesium-aluminum zinc-impregnation agent further comprises 2 parts of a first active agent capable of promoting magnesium to permeate into the impregnation layer and 1 part of a second active agent capable of promoting aluminum to permeate into the impregnation layer, wherein the mass part of the second active agent is smaller than that of the first active agent;
the first active agent is magnesium halide, and the second active agent is aluminum halide;
the magnesium powder is pure magnesium powder with purity more than 95% or magnesium alloy powder with weight ratio of magnesium not less than 40%.
2. A zinc magnesium aluminium zincification agent according to claim 1, wherein said dispersant is a ceramic powder and said decomposer is an ammonia halide.
3. The zinc magnesium aluminum zinc according to claim 2, wherein said ceramic powder comprises at least one of aluminum oxide, silicon oxide, magnesium oxide, aluminum nitride, silicon carbide.
4. A zinc magnesium aluminium zinc impregnation agent according to claim 2, wherein said ammonium halide comprises at least one of ammonium chloride, ammonium fluoride, ammonium iodide, ammonium bromide, ammonium bifluoride.
5. The zinc magnesium aluminum zinc impregnation agent according to claim 1, wherein the particle size of the magnesium powder is 10 μm to 500 μm, the particle size of the zinc powder is 1 μm to 200 μm, and the particle size of the dispersing agent is 5 μm to 500 μm.
6. The zinc-magnesium-aluminum zincating agent according to claim 1, further comprising manganese dioxide, wherein the mass part of the manganese dioxide is not more than the mass part of the decomposer.
7. An anti-corrosion metal piece, characterized in that the surface of the anti-corrosion metal piece is infiltrated with zinc, magnesium and aluminum by the zinc-magnesium-aluminum zinc-infiltrating agent according to any one of claims 1 to 6 to form an infiltrated layer capable of preventing corrosion of the metal piece.
8. The corrosion resistant metal piece according to claim 7, wherein the thickness of the infiltrated layer is 5 μιη to 200 μιη.
9. A method of zincating comprising:
s1, carrying out oil and rust removal treatment on a metal piece to be galvanized, and placing the treated metal piece and the zinc-magnesium-aluminum zinc-leaching agent according to any one of claims 1-6 in a closed infiltration tank;
s2, driving air in the closed infiltration tank, and closing a valve of the closed infiltration tank;
s3, heating the closed infiltration tank, and preserving heat for 1-10 hours after heating to a preset temperature to finish the zinc infiltration.
10. The method according to claim 9, wherein in step S2, the closed infiltration tank is vacuumized, or protective atmosphere is introduced into the closed infiltration tank to drive air in the closed infiltration tank, and a valve of the closed infiltration tank is closed;
in the step S3, the closed infiltration tank is subjected to heating treatment, and the temperature is kept for 1 to 10 hours under the condition of heating to 360 to 415 ℃ or 320 to 480 ℃ to finish the zinc infiltration.
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| CN101665900A (en) * | 2009-10-14 | 2010-03-10 | 北京中路大成科技发展有限公司 | Method for preparing ZnAlMg multi-component alloy anticorrosive coating on workpiece surface |
| RU2617467C1 (en) * | 2016-03-17 | 2017-04-25 | Заклад Механизни Прогресс | Composition of powder mixture for thermodiffusion zinc-plating of steel products |
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