Process for spraying special wear-resistant alloy

Abstract

The invention belongs to the technical field of alloy spraying processes, and discloses a process for spraying a special wear-resistant alloy. S1, base material surface treatment; s2, a spraying process; s3, carrying out a heat treatment process; S4, carrying out later inspection and performance testing; the base material surface treatment comprises base material surface cleaning, sand blasting treatment and drying treatment, and the spraying process comprises spraying equipment preparation. By introducing the heat treatment process, metallurgical bonding between the coating and the base material is further enhanced, the compactness and wear resistance of the coating are improved, oxidation, melting and deformation of the coating at high temperature are effectively prevented through heating and heat preservation under inert gas protection and the natural cooling process, and the wear resistance of the coating is improved. Meanwhile, the problem that the internal stress of the coating is too large due to rapid cooling is avoided, under the combined action of a series of measures, the coating has excellent wear resistance, corrosion resistance and high-temperature stability, the service life of the coating is remarkably prolonged, and the overall performance of a product is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of spraying alloy process, in particular to a process for spraying special wear-resistant alloy. Background Art

[0002] The process of spraying special wear-resistant alloys is an advanced material surface treatment technology. It uses specific process steps to firmly attach special wear-resistant alloys to the surface of the substrate in the form of a coating to improve the wear resistance, corrosion resistance and other specific properties of the substrate. The process of spraying special wear-resistant alloys mainly uses physical or chemical methods to spray special wear-resistant alloy powders or particles on the surface of the substrate, and through a series of subsequent treatments such as remelting and polishing, the coating and the substrate form a metallurgical bond, thereby obtaining a strong and excellent coating.

[0003] When using the process of spraying special wear-resistant alloys, there are still a series of problems, such as insufficient coating adhesion, poor coating uniformity, insufficient high temperature resistance, and excessive coating brittleness. Among them, due to the weak bonding between the layer and the substrate, the coating is easy to peel off after long-term use, resulting in a significant decrease in wear resistance. The uneven coating thickness during the spraying process may cause the coating to be thinner in some areas, thereby affecting the overall wear resistance and life. Areas with too thin coating thickness will be more susceptible to wear, affecting the use effect. During the spraying process of the special wear-resistant alloy coating, if the internal stress of the coating is too large or the hardness of the material itself is high, it may cause cracks or cracks in the coating, especially when the temperature changes suddenly or is subjected to mechanical shock. For equipment used in high temperature environments, if the sprayed special wear-resistant alloy material has poor high temperature resistance, the coating may oxidize, melt or deform at high temperatures, reducing its wear resistance. Therefore, in response to the above problems, the existing process still needs to be improved. Summary of the invention

[0004] The object of the present invention is to provide a process for spraying special wear-resistant alloy to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the present invention provides the following technical solution: a process for spraying a special wear-resistant alloy, comprising the following steps;

[0006] S1: substrate surface treatment;

[0007] S2: spraying process;

[0008] S3: heat treatment process;

[0009] S4: Post-inspection and performance testing;

[0010] The substrate surface treatment includes cleaning the substrate surface, sandblasting, and drying. The spraying process includes spraying equipment preparation, spraying powder preparation, spraying process, and coating quality inspection. The heat treatment process includes pre-heat treatment preparation, heat treatment process, and cooling process. The post-inspection and performance test include adhesion test, coating thickness test, hardness test, and corrosion resistance test. It also includes spraying alloy materials, substrate materials, coating post-treatment materials, high-temperature plasma spraying equipment, substrate pre-treatment equipment, and post-treatment furnace.

[0011] As a further technical solution of the present invention, the spraying alloy material includes tungsten-cobalt alloy powder (WC-Co), whose composition is WC (hard alloy part): 80%, Co (cobalt-based metal binder): 20%, and particle size: 10-45 μm. The substrate material is Q235 steel, and the coating post-treatment material includes an argon protective atmosphere. The model of the high-temperature plasma spraying equipment is Sulzer Metco 9MB plasma spray gun, the spraying current is 400-600A, the argon flow rate is 50-60L / min, the oxygen flow rate is 10-20L / min, and the heating power is 40-60kW. The substrate pretreatment equipment includes a sandblasting machine, and the particle size of the sandblasting particles is 80-120 meshes. The post-treatment furnace includes a medium frequency furnace using an argon protective atmosphere.

[0012] As a further technical solution of the present invention, the cleaning of the substrate surface includes thoroughly wiping the substrate surface with acetone to remove grease and dust, and ultrasonic cleaning to ensure that the substrate surface is free of any pollution. The sandblasting includes roughening the substrate surface with a sandblasting machine to ensure that the surface roughness (Ra) is between 6-12 μm to enhance the adhesion of the coating, using steel sand with a particle size of 80-120 mesh, a sandblasting angle of 30°-45°, and a sandblasting pressure controlled at 0.3-0.5 MPa. The drying treatment includes placing the treated substrate into a drying furnace and drying it at a temperature of 150-200°C to remove moisture and grease that may remain on the surface of the substrate. The drying time is 30 minutes to ensure that the surface is dry.

[0013] As a further technical solution of the present invention, the preparation of the spraying equipment includes confirming that the gas flow, current and voltage settings of the spraying equipment are appropriate, wherein the voltage is set to 60-80V, and the preparation of the spraying powder includes using WC-Co powder with a particle size range of 10-45μm to ensure powder fluidity and melting effect, and adjusting the supply amount of the spraying powder according to the coating requirements, with a control range of 10-15g / min.

[0014] As a further technical solution of the present invention, the spraying process includes ensuring that the distance between the spray gun and the surface of the substrate is maintained between 150-250 mm, using a cross-spraying method during spraying, controlling the thickness of each layer of coating to 100-150 μm, and the total coating thickness to 150-300 μm, and the spraying speed is 1-2 m / min, ensuring uniform coating thickness, avoiding local thin or thick coating, and maintaining a stable temperature range of 1800-2200 ° C during the spraying process to avoid excessive oxidation or melting of the powder due to excessive temperature. The coating quality inspection includes using a non-contact coating thickness meter to detect the coating thickness after spraying is completed to ensure that the coating thickness is within a predetermined range of 150-300 μm, and using a microscope to inspect the coating surface to ensure that the coating is uniform and free of pores and cracks.

[0015] As a further technical solution of the present invention, the preparation before heat treatment includes placing the sprayed substrate into a heat treatment furnace, ensuring that the atmosphere in the furnace is protected by inert gas to prevent oxidation of the coating. The heat treatment process includes heating the coating material to 500-600°C and maintaining it for 2-3 hours to ensure that the coating is sintered densely. The insulation time is controlled to 2-3 hours to ensure that the metal bonding layer between the coating and the substrate is completely sintered to enhance adhesion and wear resistance. The cooling process includes closing the furnace door and cooling naturally after heating is completed to avoid rapid cooling that causes excessive stress in the coating, resulting in cracks or peeling.

[0016] As a further technical solution of the present invention, the adhesion test includes using a pull-off test and a scraper test to check the adhesion between the coating and the substrate. The adhesion standard is that there is no peeling phenomenon at the interface between the coating and the substrate, and the pull-off strength between the coating and the substrate should be greater than 20Mpa. The coating thickness test includes using a coating thickness measuring instrument to detect the actual thickness of the coating to ensure that the coating thickness is 150-300μm.

[0017] As a further technical solution of the present invention, the hardness test includes using a Vickers hardness tester to perform a hardness test on the coating, requiring the coating hardness to reach 850-1000HV to ensure the wear resistance of the coating, and the corrosion resistance test includes using a salt spray test to evaluate the corrosion resistance of the coating to ensure its stability in a humid or chemically corrosive environment.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The present invention greatly improves the overall quality and performance of the coating through a series of fine and systematic steps. From cleaning the surface of the substrate to sandblasting and then to drying, each step ensures the cleanliness and roughness of the substrate surface, providing a solid foundation for the firm adhesion of the coating. During the spraying process, the uniformity of the coating thickness and the precise control of the predetermined range are achieved by accurately controlling the gas flow, current, voltage and supply amount of the spraying powder of the spraying equipment, combined with the cross-spraying method and the stable spraying temperature. This not only avoids the degradation of the wear resistance caused by the local thinness or thickness of the coating, but also ensures the uniformity and defect-freeness of the coating surface. The introduction of the heat treatment process further enhances the metallurgical bonding between the coating and the substrate, improves the density and wear resistance of the coating, and effectively prevents the oxidation, melting and deformation of the coating at high temperature through heating and heat preservation under the protection of inert gas, as well as the natural cooling process, while avoiding the problem of excessive internal stress of the coating caused by rapid cooling. Under the joint action of this series of measures, the coating has excellent wear resistance, corrosion resistance and high temperature stability, significantly prolongs the service life of the coating, and improves the overall performance of the product.

[0020] 2. The present invention comprehensively evaluates various performance indicators of the coating through adhesion test, coating thickness test, hardness test and corrosion resistance test, ensuring the reliability and stability of the coating quality. The adhesion test ensures the firm bond between the coating and the substrate, avoiding the problem of coating peeling after long-term use. The coating thickness test ensures the uniformity and functionality of the coating thickness, ensuring that the coating performs the best effect within the predetermined range. The hardness test ensures that the coating has sufficient wear resistance and can resist external friction and wear, further improving the durability of the product. The corrosion resistance test verifies the stability of the coating under moisture or chemical corrosion conditions by simulating harsh environments, ensuring the reliability of the coating in various application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the overall system block diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the substrate surface treatment process of the present invention;

[0023] Figure 3 It is a schematic diagram of the surface flow of the spraying process of the present invention;

[0024] Figure 4 It is a schematic diagram of the heat treatment process of the present invention;

[0025] Figure 5 It is a schematic diagram of the later inspection and performance testing process of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figures 1 to 5 As shown, in an embodiment of the present invention, a process for spraying a special wear-resistant alloy includes the following steps:

[0028] S1: substrate surface treatment;

[0029] S2: spraying process;

[0030] S3: heat treatment process;

[0031] S4: Post-inspection and performance testing;

[0032] The surface treatment of the substrate includes cleaning the substrate surface, sandblasting, and drying treatment. The spraying process includes spraying equipment preparation, spraying powder preparation, spraying process, and coating quality inspection. The heat treatment process includes pre-heat treatment preparation, heat treatment process, and cooling process. Post-inspection and performance testing include adhesion test, coating thickness test, hardness test, and corrosion resistance test. It also includes spraying alloy materials, substrate materials, coating post-treatment materials, high-temperature plasma spraying equipment, substrate pretreatment equipment, and post-treatment furnace.

[0033] Through systematic steps, including careful preparation of the substrate, precise spraying and heat treatment, and comprehensive post-inspection and performance testing, the wear resistance and overall performance of the coating are significantly improved. This process not only ensures a strong bond between the coating and the substrate, but also optimizes the microstructure of the coating through a meticulous heat treatment process, further enhancing its hardness and corrosion resistance. In addition, this process also covers the necessary material preparation and equipment use, providing a strong guarantee for the preparation of high-quality coatings.

[0034] Among them, the spraying alloy material includes tungsten-cobalt alloy powder (WC-Co), whose composition is WC (hard alloy part): 80%, Co (cobalt-based metal binder): 20%, particle size: 10-45μm, the substrate material is Q235 steel, the coating post-treatment material includes argon protective atmosphere, the model of the high-temperature plasma spraying equipment is Sulzer Metco 9MB plasma spray gun, the spraying current is 400-600A, the argon flow rate is 50-60L / min, the oxygen flow rate is 10-20L / min, the heating power is 40-60kW, the substrate pre-treatment equipment includes a sandblasting machine, the particle size of the sandblasting particles is 80-120 mesh, and the post-treatment furnace includes a medium frequency furnace using an argon protective atmosphere.

[0035] The Q235 steel substrate was sprayed with tungsten-cobalt alloy powder (WC-Co), combined with the Sulzer Metco9MB plasma spray gun and optimized spray parameters to achieve high-quality coating preparation. The bonding strength and wear resistance of the coating were significantly improved through fine substrate pretreatment and argon-protected coating post-treatment. This process not only ensures the uniform distribution of coating components and the optimization of microstructure, but also further enhances the hardness and corrosion resistance of the coating through precise heat treatment.

[0036] like Figure 2 As shown, cleaning the substrate surface includes thoroughly wiping the substrate surface with acetone to remove grease and dust, and ultrasonic cleaning to ensure that the substrate surface is free of any pollution. Sandblasting includes roughening the substrate surface with a sandblasting machine to ensure that the surface roughness (Ra) is between 6-12 μm to enhance the adhesion of the coating. Steel sand with a particle size of 80-120 mesh is used, the sandblasting angle is 30°-45°, and the sandblasting pressure is controlled at 0.3-0.5 MPa. The drying treatment includes placing the treated substrate into a drying furnace and drying it at a temperature of 150-200°C to remove moisture and grease that may remain on the surface of the substrate. The drying time is 30 minutes to ensure that the surface is dry.

[0037] Through the dual cleaning methods of acetone wiping and ultrasonic cleaning, pollutants such as grease and dust on the surface of the substrate are completely removed, laying a solid foundation for subsequent processing. Sandblasting not only achieves the roughening of the substrate surface, but also ensures the maximum adhesion of the coating by precisely controlling the sandblasting parameters. The drying treatment effectively removes the residual moisture and grease on the surface of the substrate, further improving the bonding quality of the coating. This series of fine substrate surface treatment steps jointly ensures the firm bonding between the coating and the substrate, provides a reliable base for spraying special wear-resistant alloys, and significantly improves the overall performance and service life of the coating.

[0038] like Figure 3 As shown, the preparation of the spraying equipment includes confirming that the gas flow, current and voltage settings of the spraying equipment are appropriate, where the voltage is set to 60-80V. The spraying powder preparation includes using WC-Co powder with a particle size range of 10-45μm to ensure powder fluidity and melting effect, and adjusting the supply amount of the spraying powder according to the coating requirements, with a control range of 10-15g / min.

[0039] The precise preparation of the spraying equipment, especially the careful adjustment of gas flow, current and voltage, ensures the stability and efficiency of the spraying process. The careful preparation of WC-Co powder not only meets the particle size requirements, but also improves the uniformity and density of the coating by optimizing the fluidity and melting effect of the powder. At the same time, the flexible adjustment of the supply of spraying powder according to the coating requirements further ensures the controllability and consistency of the coating quality.

[0040] like Figure 3 As shown, the spraying process includes ensuring that the distance between the spray gun and the surface of the substrate is maintained between 150-250mm, using a cross-spraying method during spraying, controlling the thickness of each layer of coating at 100-150μm, and the total coating thickness is 150-300μm. The spraying speed is 1-2m / min, ensuring uniform coating thickness, avoiding local coating being too thin or too thick, and maintaining a stable temperature range of 1800-2200℃ during spraying to avoid excessive oxidation or melting of the powder due to excessive temperature. The coating quality inspection includes using a non-contact coating thickness gauge to detect the coating thickness after spraying to ensure that the coating thickness is within the predetermined range of 150-300μm, and using a microscope to inspect the coating surface to ensure that the coating is uniform and free of pores and cracks.

[0041] During the spraying process, the uniformity of the coating thickness and the realization of the predetermined range are ensured by accurately controlling the distance between the spray gun and the substrate, adopting the cross spraying method, and strictly controlling the thickness of each layer and the total coating. The stable spraying speed and temperature control effectively avoid excessive oxidation or melting of the powder and ensure the quality of the coating. The coating thickness detection and microscopic inspection after spraying further ensure that the coating is defect-free, uniform and dense. These measures jointly improve the overall performance and reliability of the coating and provide a solid guarantee for the preparation of high-quality wear-resistant alloy coatings.

[0042] like Figure 4 As shown, the preparation before heat treatment includes placing the sprayed substrate into a heat treatment furnace to ensure that the atmosphere in the furnace is protected by inert gas to prevent oxidation of the coating. The heat treatment process includes heating the coating material to 500-600°C and maintaining it for 2-3 hours to ensure that the coating is sintered densely. The insulation time is controlled to 2-3 hours to ensure that the metal bonding layer between the coating and the substrate is completely sintered to enhance adhesion and wear resistance. The cooling process includes closing the furnace door and cooling naturally after heating is completed to avoid rapid cooling that causes excessive stress in the coating, cracks or peeling.

[0043] By precisely controlling the heating temperature and holding time, the coating material can be fully sintered to form a dense structure, significantly improving the bonding strength between the coating and the substrate. In addition, the process also enhances the adhesion and wear resistance of the coating and extends the service life of the coating. The careful design of the cooling process avoids the internal stress problem of the coating caused by rapid cooling, and effectively prevents the occurrence of cracks and peeling.

[0044] like Figure 5 As shown, the adhesion test includes the use of pull-off test and scraper test to check the adhesion between the coating and the substrate. The adhesion standard is that there is no peeling phenomenon at the interface between the coating and the substrate. The pull-off strength between the coating and the substrate should be greater than 20Mpa. The coating thickness test includes using a coating thickness gauge to detect the actual thickness of the coating to ensure that the coating thickness is 150-300μm.

[0045] The beneficial effect of adhesion and coating thickness testing is to ensure the quality of the coating. Through pull-off tests and scraper tests, the bonding strength between the coating and the substrate can be accurately evaluated, the coating peeling problem during use can be prevented, and the durability and safety of the product can be improved. At the same time, coating thickness measurement guarantees the uniformity and functionality of the coating, ensuring that it performs optimally within the specified range.

[0046] like Figure 5 As shown, the hardness test includes using a Vickers hardness tester to test the hardness of the coating, requiring the coating hardness to reach 850-1000HV to ensure the wear resistance of the coating. The corrosion resistance test includes using a salt spray test to evaluate the corrosion resistance of the coating to ensure its stability in a humid or chemically corrosive environment.

[0047] Hardness and corrosion resistance tests are crucial to improving coating performance. Hardness tests ensure that the coating has sufficient wear resistance to resist external friction and wear and extend its service life. Corrosion resistance tests simulate harsh environments to verify the stability of the coating under moisture or chemical corrosion conditions, thereby ensuring the reliability of the coating in a variety of application scenarios.

[0048] Through a series of delicate and systematic steps, the overall quality and performance of the coating are greatly improved. From cleaning the surface of the substrate to sandblasting and then to drying, each step ensures the cleanliness and roughness of the substrate surface, providing a solid foundation for the firm adhesion of the coating. During the spraying process, the uniformity of the coating thickness and the precise control of the predetermined range are achieved by accurately controlling the gas flow, current, voltage and supply of the spraying equipment, combined with the cross-spraying method and stable spraying temperature. This not only avoids the degradation of wear resistance caused by local thinness or thickness of the coating, but also ensures the uniformity and defect-freeness of the coating surface. The introduction of heat treatment process further enhances the metallurgical bonding between the coating and the substrate, improves the density and wear resistance of the coating, and effectively prevents the oxidation, melting and deformation of the coating at high temperature through heating and insulation under the protection of inert gas, as well as the natural cooling process. At the same time, the problem of excessive internal stress in the coating caused by rapid cooling is avoided. Under the joint action of this series of measures, the coating has excellent wear resistance, corrosion resistance and high temperature stability, which significantly extends the service life of the coating and improves the overall performance of the product.

[0049] Through adhesion test, coating thickness test, hardness test and corrosion resistance test, the performance indicators of the coating are comprehensively evaluated to ensure the reliability and stability of the coating quality. The adhesion test ensures the strong bond between the coating and the substrate, avoiding the problem of coating peeling after long-term use. The coating thickness test ensures the uniformity and functionality of the coating thickness, ensuring that the coating performs the best effect within the predetermined range. The hardness test ensures that the coating has sufficient wear resistance and can resist external friction and wear, further improving the durability of the product. The corrosion resistance test verifies the stability of the coating under moisture or chemical corrosion conditions by simulating harsh environments, ensuring the reliability of the coating in various application scenarios.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for spraying a special wear-resistant alloy, comprising the following steps; S1: substrate surface treatment; S2: spraying process; S3: heat treatment process; S4: Post-inspection and performance testing; The substrate surface treatment includes cleaning the substrate surface, sandblasting, and drying. The spraying process includes spraying equipment preparation, spraying powder preparation, spraying process, and coating quality inspection. The heat treatment process includes pre-heat treatment preparation, heat treatment process, and cooling process. The post-inspection and performance test include adhesion test, coating thickness test, hardness test, and corrosion resistance test. It also includes spraying alloy materials, substrate materials, coating post-treatment materials, high-temperature plasma spraying equipment, substrate pre-treatment equipment, and post-treatment furnace.

2. A process for spraying special wear-resistant alloy according to claim 1, characterized in that: The spraying alloy material includes tungsten-cobalt alloy powder (WC-Co), whose composition is WC (hard alloy part): 80%, Co (cobalt-based metal binder): 20%, and particle size: 10-45μm. The substrate material is Q235 steel. The coating post-treatment material includes an argon protective atmosphere. The model of the high-temperature plasma spraying equipment is Sulzer Metco 9MB plasma spray gun, the spraying current is 400-600A, the argon flow rate is 50-60L / min, the oxygen flow rate is 10-20L / min, and the heating power is 40-60kW. The substrate pre-treatment equipment includes a sandblasting machine, and the particle size of the sandblasting particles is 80-120 meshes. The post-treatment furnace includes a medium frequency furnace using an argon protective atmosphere.

3. The process for spraying special wear-resistant alloy according to claim 1, characterized in that: The cleaning of the substrate surface includes thoroughly wiping the substrate surface with acetone to remove grease and dust, and ultrasonic cleaning to ensure that the substrate surface is free of any pollution. The sandblasting includes roughening the substrate surface with a sandblasting machine to ensure that the surface roughness (Ra) is between 6-12 μm to enhance the adhesion of the coating, using steel sand with a particle size of 80-120 mesh, a sandblasting angle of 30°-45°, and a sandblasting pressure controlled at 0.3-0.5 MPa. The drying treatment includes placing the treated substrate into a drying furnace and drying it at a temperature of 150-200° C. to remove moisture and grease that may remain on the substrate surface. The drying time is 30 minutes to ensure that the surface is dry.

4. The process for spraying special wear-resistant alloy according to claim 1, characterized in that: The spray equipment preparation includes confirming that the gas flow, current and voltage settings of the spray equipment are appropriate, wherein the voltage is set to 60-80V. The spray powder preparation includes using WC-Co powder with a particle size range of 10-45μm to ensure powder fluidity and melting effect, and adjusting the supply amount of the spray powder according to the coating requirements, with a control range of 10-15g / min.

5. The process for spraying special wear-resistant alloy according to claim 1, characterized in that: The spraying process includes ensuring that the distance between the spray gun and the surface of the substrate is maintained between 150-250mm, using a cross-spraying method during spraying, controlling the thickness of each layer of coating to 100-150μm, and the total coating thickness to 150-300μm, and the spraying speed is 1-2m / min, ensuring that the coating thickness is uniform, avoiding local excessive thinness or excessive thickness of the coating, maintaining a stable temperature range of 1800-2200°C during the spraying process, avoiding excessive oxidation or melting of the powder due to excessive temperature, and the coating quality inspection includes using a non-contact coating thickness measuring instrument to detect the coating thickness after spraying is completed, ensuring that the coating thickness is within a predetermined range of 150-300μm, and using a microscope to inspect the coating surface to ensure that the coating is uniform and free of pores and cracks.

6. A process for spraying special wear-resistant alloy according to claim 1, characterized in that: The preparation before heat treatment includes placing the sprayed substrate into a heat treatment furnace, ensuring that the atmosphere in the furnace is protected by inert gas to prevent oxidation of the coating. The heat treatment process includes heating the coating material to 500-600°C and maintaining it for 2-3 hours to ensure that the coating is sintered densely. The insulation time is controlled to 2-3 hours to ensure that the metal bonding layer between the coating and the substrate is completely sintered to enhance adhesion and wear resistance. The cooling process includes closing the furnace door and cooling naturally after heating is completed to avoid rapid cooling that causes excessive stress in the coating, cracks or peeling.

7. The process for spraying special wear-resistant alloy according to claim 1, characterized in that: The adhesion test includes using a pull-off test and a scraper test to check the adhesion between the coating and the substrate. The adhesion standard is that there is no peeling phenomenon at the interface between the coating and the substrate, and the pull-off strength between the coating and the substrate should be greater than 20Mpa. The coating thickness test includes using a coating thickness measuring instrument to detect the actual thickness of the coating to ensure that the coating thickness is 150-300μm.

8. The process for spraying special wear-resistant alloy according to claim 1, characterized in that: The hardness test includes using a Vickers hardness tester to test the hardness of the coating, requiring the coating hardness to reach 850-1000HV to ensure the wear resistance of the coating. The corrosion resistance test includes using a salt spray test to evaluate the corrosion resistance of the coating to ensure its stability in a humid or chemically corrosive environment.

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