A high temperature carbonization corrosion resistant coating material and a coating preparation method

Abstract

A high temperature carbonization corrosion resistant coating material and a coating preparation method belong to the field of surface coating technology, and overcome the defect in the prior art that the hot end component material is in a high temperature and high pressure carbonization corrosion environment and is easily corroded by carbonization. The high temperature carbonization corrosion resistant coating material of the invention comprises nickel, iron-aluminum alloy, cobalt and ammonium chloride; the nickel, iron-aluminum alloy, cobalt and ammonium chloride are respectively 35-40%, 50-60%, 1-5% and 1-5% in terms of mass percentage. The invention improves the material's ability to resist carbonization corrosion.

Description

Technical Field

[0001] The invention belongs to the technical field of surface coatings, and in particular relates to a high-temperature carbonization corrosion resistant coating material and a coating preparation method. Background Art

[0002] my country's supercritical carbon dioxide (S-CO 2 The demonstration application of the ) cycle power generation test unit and the successful grid-connected power generation of the fourth-generation high-temperature gas-cooled reactor (HTGR) nuclear power unit indicate that my country's energy industry has entered a new stage under the low-carbon, clean and efficient development, and has become a research hotspot in the energy industry. In the above-mentioned system, the hot end component materials, such as heat transfer tubes and heat exchange tubes, are usually in a high-temperature and high-pressure carbonization corrosion environment, facing significant carburization, carbonization and other superimposed corrosion, causing catastrophic damage to the materials, and also having a great impact on the mechanical properties of the materials, reducing the impact toughness of the materials, and the embrittlement tendency is obvious, which is very likely to cause premature fracture accidents of the hot end components.

[0003] The preparation of corrosion-resistant coatings on the alloy surface provides a new technical approach to solve high-temperature carburization corrosion. Usually the coating is relatively thin, which can improve and meet the special requirements of the service environment for the surface function of the alloy without affecting the performance of the alloy matrix, protect metal parts from high-temperature corrosion in the service environment, and significantly reduce the corrosion process of the alloy surface. In recent years, research on high-temperature coating technology at home and abroad has mainly focused on aluminide coatings and multi-element coatings. Aluminide coatings use Al as the main corrosion-resistant element, and a coating is formed on the surface of the alloy matrix in the form of aluminum intermetallic compounds by adding a small amount of modifying elements such as Cr, Si, Ni, and Ti; Hewlett-Packard Company of the United States used physical vapor deposition to prepare FeCrAlY coatings on the FeCrAlY alloy developed by General Motors. The results showed that its resistance to high-temperature oxidation is not ideal. French scientists prepared Al-Si coating on the surface of martensitic steel. However, this method has a low deposition rate, and the reaction source and reaction residual gas are flammable, explosive or toxic. It is only suitable for components with small size and complex shape. European scholars use the traditional thermal diffusion aluminum infiltration method to prepare aluminide coating on the surface of heat-resistant steel. However, this process has a long insulation time, which not only changes the alloy matrix structure and leads to deterioration of mechanical properties, but also has poor thermal matching between the coating and the substrate. Under tensile stress (thermal expansion coefficient: η-Fe 2 Al 5 >20×10 -6 / ℃, which is about 11×10 higher than ferrite -6 / ℃ and austenitic steel is about 18×10 -6 / ℃), resulting in a large number of through cracks in the prepared coating. In the early days, my country used hot-dip aluminum technology to prepare an alloy layer with FeAl as the main phase on the surface of the pipeline, which significantly improved the pipeline's resistance to high-temperature coal ash corrosion. However, the coating obtained in this way is brittle and easy to fall off, making it difficult to carry out practical applications, and the coating's resistance to high-temperature carburization corrosion is still unclear. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the hot end component material is in a high temperature and high pressure carburization corrosion environment and is easily subject to carburization corrosion, thereby providing a high temperature carburization corrosion resistant coating material and a coating preparation method. The preparation method is simple and efficient, the prepared coating is metallurgically bonded to the alloy substrate and is not easy to peel off, and the coating has significant anti-carburization corrosion performance.

[0005] To this end, the present invention provides the following technical solutions.

[0006] In a first aspect, the present invention provides a high temperature carburization corrosion resistant coating material, comprising nickel, iron-aluminum alloy, cobalt and ammonium chloride;

[0007] The nickel, iron-aluminum alloy, cobalt and ammonium chloride are respectively 35-40%, 50-60%, 1-5% and 1-5% in terms of mass percentage.

[0008] Further, it also includes a binder;

[0009] Preferably, the ratio of the total mass of the nickel, iron-aluminum alloy, cobalt and ammonium chloride to the volume of the binder is 1-5 g / ml.

[0010] Furthermore, the binder comprises, by volume percentage, 0.5-2% of ethyl acetate and 98-99.5% of acrylic resin.

[0011] In a second aspect, the present invention provides a method for preparing a high temperature carburization corrosion resistant coating, comprising the following steps:

[0012] Step 1, preheating the substrate;

[0013] Step 2: Mix 35-40% nickel, 50-60% iron-aluminum alloy, 1-5% cobalt and 1-5% ammonium chloride by mass percentage, and then add a binder to obtain a high temperature carburization corrosion resistant coating material;

[0014] Step 3, coating the high temperature carburization corrosion resistant coating material on the surface of the substrate, and drying to obtain a coating layer;

[0015] Step 4: Sintering the substrate with the coating layer under oxygen-free conditions to obtain a high-temperature carburization corrosion resistant coating.

[0016] Furthermore, in step 1, the preheating temperature is 180-220° C., and the preheating time is 30-60 minutes.

[0017] Furthermore, in step 3, the steps of coating the high temperature carburization corrosion resistant coating material on the substrate surface and drying are repeated 3 to 4 times;

[0018] Preferably, the drying temperature is 77-100° C., and the drying time each time is 10-20 hours.

[0019] Furthermore, in step 3, the thickness of the high temperature carburization corrosion resistant coating material applied each time is 0.2 to 0.5 mm, and the thickness of the final coating layer obtained is 0.6 to 2 mm.

[0020] Furthermore, in step 4, the sintering temperature is 950-1150° C., and the sintering time is 10-20 min.

[0021] Furthermore, in step 4, water cooling or liquid nitrogen cooling is used for rapid cooling after sintering;

[0022] After cooling, the residues after sintering of the coating layer are removed, and a high-temperature carburization corrosion resistant coating is prepared on the surface of the substrate.

[0023] Furthermore, the thickness of the obtained high temperature carburization corrosion resistant coating is 20 to 55 μm.

[0024] Further, at least one of the nickel powder, the iron-aluminum alloy powder and the cobalt powder has a purity of 99.9% and a particle size of 1000 mesh;

[0025] Furthermore, the ammonium chloride is AR grade analytical grade with a mass fraction of 99.5% and a particle size of 500 mesh;

[0026] Furthermore, the ethyl acetate is AR grade analytical grade with a mass fraction of 99.5%;

[0027] Furthermore, the acrylic resin is a water-soluble acrylic resin with a mass fraction of 70%.

[0028] Optionally, the sintering may be performed using a vacuum tube sealing technique, a vacuum sintering furnace or an atmosphere sintering furnace.

[0029] The technical solution of the present invention has the following advantages:

[0030] 1. The high-temperature carburization corrosion resistant coating material provided by the present invention comprises nickel, iron-aluminum alloy, cobalt and ammonium chloride; the mass percentages of nickel, iron-aluminum alloy, cobalt and ammonium chloride are 35-40%, 50-60%, 1-5% and 1-5%, respectively; the atomic ratio of iron to aluminum in the iron-aluminum alloy is 1:1.

[0031] Nickel and cobalt are not easy to form carbides with C elements, which can improve the coating's anti-carburization ability; Co has high hardness and strength, and can be alloyed during coating sintering, which can improve the coating's toughness and impact resistance and reduce coating cracking; Ni has a low expansion coefficient and excellent corrosion resistance, and forms a NiAl phase with the corrosion-resistant element active Al atoms in the coating, reducing the difference in thermal expansion coefficients between the coating and the substrate and improving the bonding performance between the coating and the substrate. Iron-aluminum alloy has a high melting point, and can form a nickel (iron) / aluminum alloy layer on the substrate surface through atomic diffusion during sintering; ammonium chloride decomposes during the sintering process to generate a reducing atmosphere, which can prevent oxygen from entering and avoid oxidation of the high-temperature carbonization corrosion-resistant coating material.

[0032] 2. The high temperature carburization corrosion resistant coating material provided by the present invention also includes a binder, which includes 0.5-2% ethyl acetate and 98-99.5% acrylic resin by volume percentage. The binder of the present application is an organic matter, which can be decomposed and removed during the sintering process, and the use of the binder of the present invention can ensure that nickel, iron-aluminum alloy, cobalt and ammonium chloride are evenly distributed without segregation.

[0033] 3. The high-temperature carburization corrosion resistant coating material of the present invention is safe and pollution-free, has a simple preparation process, and is easy to carry. It can meet the urgent needs of resisting carburization corrosion on the surface of heat transfer material components such as austenitic steel and high-temperature alloys in various high-carbon potential environments. It has a wide range of applications and strong applicability.

[0034] 4. In the method for preparing the high temperature carbonization corrosion resistant coating of the present invention, in step 3, the steps of coating the high temperature carbonization corrosion resistant coating material on the substrate surface and drying are repeated 3 to 4 times. The repeated coating method effectively avoids cracking, peeling, and blistering of the coating layer, and avoids unevenness of the final coating.

[0035] 5. In the method for preparing the high temperature carburization corrosion resistant coating of the present invention, in step 4, the sintering temperature is 950-1150°C and the sintering time is 10-20 minutes. The sintering temperature window is large, the sintering time is short, the preparation efficiency is high, and the short-time sintering has little effect on the alloy matrix of the component, does not damage the matrix structure, and does not reduce the mechanical properties of the original alloy.

[0036] 6. The high-temperature carburization corrosion resistant coating of the present invention has a uniform and dense structure, is metallurgically bonded to the substrate, has a moderate thickness, is not easy to peel off, has an extremely low coating preparation defect rate, has excellent high-temperature carburization corrosion resistance, has a low degradation rate, has a long effective protection period, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 This is a cross-sectional morphology photograph of the high temperature carburization corrosion resistant coating prepared in Example 1 of the present invention;

[0039] Figure 2 This is a cross-sectional morphology photograph of the high temperature carburization corrosion resistant coating prepared in Example 3 of the present invention;

[0040] Figure 3 This is a cross-sectional morphology photograph of the high temperature carburization corrosion resistant coating prepared in Example 5 of the present invention;

[0041] Figure 4 Comparison of the corrosion cross-section morphology of the high temperature carburization corrosion resistant coating prepared in Example 3 of the present invention (right picture) and the Incoloy800H base alloy (left picture) in a carburization environment at 650°C / 3000h;

[0042] Figure 5 Element distribution diagram of the high temperature carburization corrosion resistant coating prepared in Example 3 of the present invention after being corroded in a carburization environment at 650°C / 3000h

[0043] Figure 6 This is the element distribution diagram of Incoloy800H matrix alloy after corrosion in a carburizing environment at 650℃ / 3000h. DETAILED DESCRIPTION

[0044] The following examples are provided for a better understanding of the present invention, but are not intended to limit the best mode of implementation, nor to limit the content and protection scope of the present invention. Any product identical or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with other prior arts shall fall within the protection scope of the present invention.

[0045] If no specific experimental steps or conditions are specified in the examples, the conventional experimental steps or conditions described in the literature in the field can be used. If no manufacturer is specified for the reagents or instruments used, they are all conventional reagent products that can be obtained commercially.

[0046] In the embodiment, the Incoloy800H alloy tube for heat transfer tubes in the most severe carbonization corrosion environment of high-temperature gas-cooled nuclear power units is used as the substrate, and a high-temperature carbonization corrosion resistant coating is prepared on the outer surface of the Incoloy800H alloy tube. The tube specifications are an outer diameter of 19 mm, a wall thickness of 3 mm, and a length of 500 mm. The acrylic resin in the embodiment is 802C from Guangdong Aoyate Composite Materials Co., Ltd.

[0047] Example 1

[0048] This embodiment provides a method for preparing a high temperature carburization corrosion resistant coating, comprising the following steps:

[0049] Step 1, preheating the substrate at 200°C for 40 minutes;

[0050] Step 2: weigh 35% nickel powder, 55% iron-aluminum alloy powder, 5% cobalt powder and 5% ammonium chloride according to mass percentage, mix them thoroughly and evenly to obtain a mixed powder; weigh 0.5% ethyl acetate and 99.5% acrylic resin according to volume percentage, mix them thoroughly and stir them evenly to obtain a binder; add the binder to the mixed powder at a ratio of 5g:1mL, stir and ball mill to obtain a viscous high-temperature carbonization corrosion resistant coating material.

[0051] Step 3: (1) clean the substrate surface with alcohol and acetone, and place it in a 200°C oven for 40 minutes to dry and preheat;

[0052] (2) The high-temperature carburization corrosion resistant coating material was uniformly coated on the substrate surface by high-pressure spraying with a coating thickness of 0.2 mm, and dried at 77°C for 10 h. The coating-drying steps were repeated twice to obtain a coating layer with a thickness of 0.6 mm.

[0053] Step 4: Sinter the substrate with the coating layer under oxygen-free conditions at a sintering temperature of 950° C. for 10 min, then quickly cool it using water cooling, and clean the surface residue of the substrate after sintering to obtain a high-temperature carbonization corrosion resistant coating.

[0054] The thickness of the high temperature carburization corrosion resistant coating prepared in Example 1 is about 20.56 μm. Figure 1 shown.

[0055] Example 2

[0056] This embodiment provides a method for preparing a high temperature carburization corrosion resistant coating, comprising the following steps:

[0057] Step 1, preheat the substrate at 180°C for 60 minutes;

[0058] Step 2: Weigh 38% nickel powder, 60% iron-aluminum alloy powder, 1% cobalt powder and 1% ammonium chloride according to mass percentage, mix them thoroughly and evenly to obtain a mixed powder; weigh 0.5% ethyl acetate and 99.5% acrylic resin according to volume percentage, mix them thoroughly and stir them evenly to obtain a binder; add the binder to the mixed powder at a ratio of 5g:1mL, stir and ball-mill to obtain a viscous high-temperature carbonization corrosion resistant coating material.

[0059] Step 3: (1) clean the substrate surface with alcohol and acetone, and dry and preheat in a 200°C oven for 30 minutes;

[0060] (2) The high-temperature carburization corrosion resistant coating material was uniformly coated on the substrate surface by high-pressure spraying, with a coating thickness of 0.3 mm, and dried at 80°C for 10 h. The coating-drying steps were repeated twice to obtain a coating layer with a thickness of 0.9 mm.

[0061] Step 4: Sinter the substrate with the coating layer under oxygen-free conditions at a sintering temperature of 1000° C. for 12 minutes, then quickly cool it using water cooling, and clean the surface residue of the substrate after sintering to obtain a high-temperature carbonization corrosion resistant coating.

[0062] The thickness of the high temperature carburization corrosion resistant coating prepared in this Example 1 is about 29.73 μm.

[0063] Example 3

[0064] This embodiment provides a method for preparing a high temperature carburization corrosion resistant coating, comprising the following steps:

[0065] Step 1, preheat the substrate at 220°C for 30 min;

[0066] Step 2: Weigh 38% nickel powder, 58% iron-aluminum alloy powder, 3% cobalt powder and 1% ammonium chloride according to mass percentage, mix them thoroughly and evenly to obtain a mixed powder; weigh 1% ethyl acetate and 99% acrylic resin according to volume percentage, mix them thoroughly and stir them evenly to obtain a binder; add the binder to the mixed powder at a ratio of 5g:1mL, stir and ball-mill to obtain a viscous high-temperature carbonization corrosion resistant coating material.

[0067] Step 3: (1) clean the surface of the substrate with alcohol and acetone, and dry and preheat in an oven at 200°C for 60 minutes;

[0068] (2) The high-temperature carburization corrosion resistant coating material was uniformly coated on the substrate surface by high-pressure spraying, with a coating thickness of 0.4 mm, and dried at 85°C for 10 h. The above coating-drying steps were repeated twice to obtain a coating layer with a thickness of 1.2 mm.

[0069] Step 4: Sinter the substrate with the coating layer under oxygen-free conditions at a sintering temperature of 1050° C. for 15 minutes, then quickly cool it using water cooling, and clean the surface residue of the substrate after sintering to obtain a high-temperature carbonization corrosion resistant coating.

[0070] The thickness of the high temperature carburization corrosion resistant coating prepared in Example 1 is about 40.62 μm. Figure 2 shown.

[0071] Example 4

[0072] This embodiment provides a method for preparing a high temperature carburization corrosion resistant coating, comprising the following steps:

[0073] Step 1, preheating the substrate at 200°C for 40 minutes;

[0074] Step 2: Weigh 40% nickel powder, 50% iron-aluminum alloy powder, 5% cobalt powder and 5% ammonium chloride by mass percentage, mix them thoroughly and evenly to obtain a mixed powder; weigh 1.5% ethyl acetate and 98.5% acrylic resin by volume percentage, mix them thoroughly and stir them evenly to obtain a binder; add the binder to the mixed powder at a ratio of 5 g:1 mL, stir and ball mill to obtain a viscous high-temperature carbonization corrosion resistant coating material.

[0075] Step 3: (1) clean the surface of the substrate with alcohol and acetone, and dry and preheat in an oven at 200°C for 60 minutes;

[0076] (2) The high-temperature carburization corrosion resistant coating material was uniformly coated on the substrate surface by high-pressure spraying with a coating thickness of 0.5 mm, and dried at 90°C for 10 h. The coating-drying steps were repeated twice to obtain a coating layer with a thickness of 1.5 mm.

[0077] Step 4: Sinter the substrate with the coating layer under oxygen-free conditions at a sintering temperature of 1100° C. for 18 minutes, then quickly cool it using water cooling, and clean the surface residue of the substrate after sintering to obtain a high-temperature carbonization corrosion resistant coating.

[0078] The thickness of the high temperature carburization corrosion resistant coating prepared in this Example 1 is about 46.31 μm.

[0079] Example 5

[0080] This embodiment provides a method for preparing a high temperature carburization corrosion resistant coating, comprising the following steps:

[0081] Step 1, preheating the substrate at 200°C for 40 minutes;

[0082] Step 2: Weigh 40% nickel powder, 55% iron-aluminum alloy powder, 1% cobalt powder and 4% ammonium chloride according to mass percentage, mix them thoroughly and evenly to obtain a mixed powder; weigh 2% ethyl acetate and 98% acrylic resin according to volume percentage, mix them thoroughly and stir them evenly to obtain a binder; add the binder to the mixed powder at a ratio of 5g:1mL, stir and ball-mill to obtain a viscous high-temperature carbonization corrosion resistant coating material.

[0083] Step 3: (1) clean the substrate surface with alcohol and acetone, and dry and preheat in a 200°C oven for 30 minutes;

[0084] (2) The high-temperature carburization corrosion resistant coating material was uniformly coated on the substrate surface by high-pressure spraying with a coating thickness of 0.5 mm, and dried at 100°C for 10 h. The above coating-drying steps were repeated 3 times to obtain a coating layer with a thickness of 2 mm.

[0085] Step 4: Sinter the substrate with the coating layer under oxygen-free conditions at a sintering temperature of 1150° C. for 20 min, then quickly cool it using water cooling, and clean the surface residue of the substrate after sintering to obtain a high-temperature carbonization corrosion resistant coating.

[0086] The thickness of the high temperature carburization corrosion resistant coating prepared in Example 1 is about 50.69 μm. Figure 3 shown.

[0087] A 650°C high temperature saturated carburization corrosion comparison test was carried out on the coatings prepared under the parameters of each embodiment and the base alloy Incoloy800H to assess the high temperature carburization corrosion resistance of the coating; the comparison of the carburization corrosion cross-section morphology of the Incoloy800H base alloy and the coating prepared in Example 3 is shown in the attached Figure 4 ,Depend on Figure 4 The left picture (Incoloy800H matrix) shows that the Incoloy800H matrix alloy has a large depth of carbide corrosion. The outermost layer has formed a corrosion product layer mainly composed of carbides. The inner layer is the carbide corrosion affected layer. A large number of aluminide particles are distributed along the alloy grain boundaries. The corrosion product layer and the carbide corrosion affected layer are collectively called the carbide corrosion layer. Figure 4 The right figure (coating prepared in Example 3) shows that the thickness of the carburization corrosion layer is relatively thin, and the outermost layer has fewer corrosion products, which are extremely difficult to distinguish. Therefore, the corrosion product layer is not marked, and only the carburization corrosion layer is marked. It can be seen that after 3000h of corrosion time, the coating's resistance to high-temperature carburization corrosion is more than 10 times higher than that of the Incoloy800H base alloy, and the high-temperature carburization corrosion resistance effect is significant.

[0088] Depend on Figure 5 , Figure 6It can be seen that the carburization corrosion products of Incoloy800H matrix alloy are mainly carbides, aluminide particles are distributed along the grain boundaries inside the alloy, the alloy has a deep carburization corrosion degree, and the carbon atom diffusion range is large; while after the carburization corrosion of the coating, a thinner carburization corrosion layer is formed on the outer layer of the coating, the coating structure is complete, the diffusion of carbon atoms is hindered, and no diffused carbon atoms are detected in the coating, which effectively improves the alloy's resistance to high-temperature carburization corrosion.

[0089] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention.

Claims

1. A high temperature carburization corrosion resistant coating material, characterized in that: These include nickel, iron-aluminum alloys, cobalt, and ammonium chloride; Nickel, iron-aluminum alloy, cobalt and ammonium chloride are 35-40%, 50-60%, 1-5% and 1-5% respectively in terms of mass percentage.

2. The high temperature carburization corrosion resistant coating material according to claim 1, characterized in that: Also included is a binder.

3. The high temperature carburization corrosion resistant coating material according to claim 2, characterized in that: The ratio of the total mass of the nickel, the iron-aluminum alloy, the cobalt and the ammonium chloride to the volume of the binder is 1-5 g / ml.

4. The high temperature carburization corrosion resistant coating material according to claim 2, characterized in that: The binder comprises 0.5-2% of ethyl acetate and 98-99.5% of acrylic resin in terms of volume percentage.

5. A method for preparing a high temperature carburization corrosion resistant coating, characterized in that: The following steps are involved: Step 1, preheating the substrate; Step 2: Mix 35-40% nickel, 50-60% iron-aluminum alloy, 1-5% cobalt and 1-5% ammonium chloride by mass percentage, and then add a binder to prepare a high temperature carburization corrosion resistant coating material; Step 3, coating the high temperature carburization corrosion resistant coating material on the surface of the substrate, and drying to obtain a coating layer; Step 4: Sintering the substrate with the coating layer under oxygen-free conditions to obtain a high-temperature carburization corrosion resistant coating.

6. The method for preparing a high temperature carburization corrosion resistant coating according to claim 5, characterized in that: In step 1, the preheating temperature is 180-220° C., and the preheating time is 30-60 min.

7. The method for preparing the high temperature carburization corrosion resistant coating according to claim 5, characterized in that: In step 3, the steps of coating the high temperature carburization corrosion resistant coating material on the substrate surface and drying are repeated 3 to 4 times.

8. The method for preparing a high temperature carburization corrosion resistant coating according to claim 7, characterized in that: The drying temperature is 77-100° C., and the drying time is 10-20 hours each time.

9. The method for preparing a high temperature carburization corrosion resistant coating according to claim 7, characterized in that: In the step 3, the thickness of the high temperature carburization corrosion resistant coating material applied each time is 0.2-0.5 mm, and the thickness of the final coating layer obtained is 0.6-2 mm.

10. The method for preparing a high temperature carburization corrosion resistant coating according to any one of claims 5 to 9, characterized in that: In step 4, the sintering temperature is 950-1150° C., and the sintering time is 10-20 min.

11. The method for preparing a high temperature carburization corrosion resistant coating according to any one of claims 5 to 9, characterized in that: In the step 4, after sintering, rapid cooling is performed by water cooling or liquid nitrogen cooling; After cooling, the residues after sintering of the coating layer are removed, and a high-temperature carburization corrosion resistant coating is prepared on the surface of the substrate.

12. The method for preparing a high temperature carburization corrosion resistant coating according to any one of claims 5 to 9, characterized in that: The thickness of the prepared high temperature carburization corrosion resistant coating is 20-55 μm.

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