A heat-resistant steel surface treatment process

Abstract

The present invention relates to the technical field of material surface treatment, and in particular to a surface treatment process for heat-resistant steel, comprising the following process steps: 1) pretreatment; 2) composite coating spraying; 3) curing treatment; 4) laser strengthening treatment; 5) chemical conversion treatment; 6) polishing treatment; the present invention uses composite coating material spraying and forms a microstructure through laser strengthening treatment, which significantly improves the corrosion resistance, oxidation resistance and mechanical properties of the heat-resistant steel; through curing treatment and laser strengthening treatment, the processing time is shortened, the production efficiency is improved, the equipment investment and operating costs are reduced, and the heat-resistant steel is suitable for large-scale promotion and application.

Description

Technical Field

[0001] The invention relates to the technical field of material surface treatment, and more specifically to a surface treatment process for heat-resistant steel. Background Art

[0002] In the application of heat-resistant steel, surface treatment is an important means to improve its service life and performance. Existing heat-resistant steel surface treatment methods mainly include oxidation treatment, plating treatment, nitriding treatment, coating treatment, etc. However, these traditional methods have the following limitations: many traditional treatment methods require a long processing time and complex process flow, resulting in low production efficiency; some advanced treatment methods, such as laser surface modification and vacuum coating, although the effect is good, but the equipment investment is large, the operating cost is high, and it is difficult to promote and apply on a large scale.

[0003] Therefore, developing an efficient and low-cost surface treatment process for heat-resistant steel has important practical significance and technical value. Summary of the invention

[0004] The purpose of the present invention is to provide a heat-resistant steel surface treatment process, which can shorten the treatment time, improve the production efficiency, and reduce the equipment investment and operation cost.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] A heat-resistant steel surface treatment process includes the following process steps:

[0007] 1) Pretreatment: Clean and degrease the heat-resistant steel parts to ensure that the surface is clean and free of impurities;

[0008] 2) Composite coating spraying: using a composite coating material, spraying a layer of composite coating with a thickness of 50 to 100 microns on the surface of the heat-resistant steel; the composite coating material is mixed in proportion by nano-scale ceramic particles (70wt%), nickel-based alloy powder (20wt%) and organic binder (10wt%);

[0009] 3) Curing treatment: Place the sprayed heat-resistant steel parts into a curing furnace and perform high-temperature curing treatment at a temperature ranging from 200°C to 400°C for 5 to 15 minutes;

[0010] 4) Laser strengthening treatment: Scanning the cured coating surface with a high-energy pulsed laser beam to form a microstructure, which is a tiny protrusion and pit formed by laser cladding, with a diameter of 1 to 5 microns and a depth of 0.5 to 2 microns;

[0011] 5) Chemical conversion treatment: immerse the heat-resistant steel parts after laser strengthening treatment in a chemical solution containing phosphate and silicate, and perform chemical conversion treatment at a temperature ranging from 60°C to 80°C for a treatment time of 10 minutes to 30 minutes;

[0012] 6) Polishing: Polish the heat-resistant steel parts after chemical conversion treatment to remove surface defects.

[0013] Furthermore, in step 2), the nano-scale ceramic particles in the composite coating material are selected from one or more of aluminum oxide, zirconium oxide, and silicon carbide.

[0014] Furthermore, in step 4), the laser wavelength used in the laser strengthening treatment is 1064 nm, and the laser power density is 10 6 W / cm 2 Up to 10 7 W / cm 2 , scanning speed is 10m / s to 30m / s.

[0015] Furthermore, in step 5), the phosphate concentration in the chemical solution is 10 g / L to 20 g / L, and the silicate concentration is 5 g / L to 15 g / L.

[0016] Furthermore, in step 6), the polishing process is performed by mechanical polishing or electrolytic polishing.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention uses composite coating material spraying and forms a microstructure through laser strengthening treatment, which significantly improves the corrosion resistance, oxidation resistance and mechanical properties of heat-resistant steel; through solidification treatment and laser strengthening treatment, the processing time is shortened, the production efficiency is improved, the equipment investment and operating costs are reduced, and it is suitable for large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an operation flow chart of the surface treatment process of the present invention. DETAILED DESCRIPTION

[0020] like Figure 1 As shown, a heat-resistant steel surface treatment process includes the following process steps:

[0021] 1) Pretreatment: Clean and degrease the heat-resistant steel parts to ensure that the surface is clean and free of impurities;

[0022] 2) Composite coating spraying: using a composite coating material, spraying a layer of composite coating with a thickness of 50 to 100 microns on the surface of the heat-resistant steel; the composite coating material is mixed in proportion by nano-scale ceramic particles (70wt%), nickel-based alloy powder (20wt%) and organic binder (10wt%);

[0023] 3) Curing treatment: Place the sprayed heat-resistant steel parts into a curing furnace and perform high-temperature curing treatment at a temperature ranging from 200°C to 400°C for 5 to 15 minutes;

[0024] 4) Laser strengthening treatment: Scanning the cured coating surface with a high-energy pulsed laser beam to form a microstructure, which is a tiny protrusion and pit formed by laser cladding, with a diameter of 1 to 5 microns and a depth of 0.5 to 2 microns;

[0025] 5) Chemical conversion treatment: immerse the heat-resistant steel parts after laser strengthening treatment in a chemical solution containing phosphate and silicate, and perform chemical conversion treatment at a temperature ranging from 60°C to 80°C for a treatment time of 10 minutes to 30 minutes;

[0026] 6) Polishing: Polish the heat-resistant steel parts after chemical conversion treatment to remove surface defects.

[0027] In step 2), the nano-scale ceramic particles in the composite coating material are selected from one or more of aluminum oxide, zirconium oxide, and silicon carbide.

[0028] In step 4), the laser wavelength used in the laser strengthening treatment is 1064nm and the laser power density is 10 6 W / cm 2 Up to 10 7 W / cm 2 , scanning speed is 10m / s to 30m / s.

[0029] In step 5), the phosphate concentration in the chemical solution is 10 g / L to 20 g / L, and the silicate concentration is 5 g / L to 15 g / L.

[0030] In step 6), the polishing process is performed by mechanical polishing or electrolytic polishing.

[0031] Process flow:

[0032] The heat-resistant steel parts are cleaned and degreased to ensure that the surface is clean and free of impurities, providing a good base for subsequent coating spraying; a composite coating material composed of nano-scale ceramic particles (70wt%), nickel-based alloy powder (20wt%) and organic binder (10wt%) is used to spray a layer of composite coating with a thickness of 50 to 100 microns on the surface of the heat-resistant steel; the sprayed heat-resistant steel parts are placed in a curing furnace and subjected to high-temperature curing treatment in the range of 200°C to 400°C for 5 to 15 minutes to ensure the stability of the coating performance; high-energy pulse The surface of the cured coating is scanned with a laser beam to form a microstructure with a diameter of 1 to 5 microns and a depth of 0.5 to 2 microns, thereby improving the adhesion and wear resistance of the coating. The heat-resistant steel parts that have undergone laser strengthening treatment are immersed in a chemical solution containing phosphates and silicates, and chemically converted at a temperature between 60°C and 80°C for 10 to 30 minutes to further improve the corrosion resistance of the surface. The heat-resistant steel parts that have undergone chemical conversion treatment are polished to remove surface defects, ensure the surface finish and flatness of the final product, and improve the appearance quality and mechanical properties.

[0033] This process uses composite coating material spraying and forms a microstructure through laser strengthening treatment, which significantly improves the corrosion resistance, oxidation resistance and mechanical properties of heat-resistant steel. Through solidification treatment and laser strengthening treatment, the processing time is shortened, the production efficiency is improved, the equipment investment and operating costs are reduced, and it is suitable for large-scale promotion and application.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A heat-resistant steel surface treatment process, characterized in that The process steps include: 1) Pretreatment: Clean and degrease the heat-resistant steel parts to ensure that the surface is clean and free of impurities; 2) Composite coating spraying: using a composite coating material, spraying a layer of composite coating with a thickness of 50 to 100 microns on the surface of the heat-resistant steel; the composite coating material is mixed in proportion by nano-scale ceramic particles (70wt%), nickel-based alloy powder (20wt%) and organic binder (10wt%); 3) Curing treatment: Place the sprayed heat-resistant steel parts into a curing furnace and perform high-temperature curing treatment at a temperature ranging from 200°C to 400°C for 5 to 15 minutes; 4) Laser strengthening treatment: Scanning the cured coating surface with a high-energy pulsed laser beam to form a microstructure, which is a tiny protrusion and pit formed by laser cladding, with a diameter of 1 to 5 microns and a depth of 0.5 to 2 microns; 5) Chemical conversion treatment: immerse the heat-resistant steel parts after laser strengthening treatment in a chemical solution containing phosphate and silicate, and perform chemical conversion treatment at a temperature ranging from 60°C to 80°C for a treatment time of 10 minutes to 30 minutes; 6) Polishing: Polish the heat-resistant steel parts after chemical conversion treatment to remove surface defects.

2. The heat-resistant steel surface treatment process according to claim 1, characterized in that: In step 2), the nano-scale ceramic particles in the composite coating material are selected from one or more of aluminum oxide, zirconium oxide, and silicon carbide.

3. The heat-resistant steel surface treatment process according to claim 1, characterized in that: In step 4), the laser wavelength used in the laser strengthening treatment is 1064nm and the laser power density is 10 6 W / cm 2 Up to 10 7 W / cm 2 , scanning speed is 10m / s to 30m / s.

4. The heat-resistant steel surface treatment process according to claim 1, characterized in that: In step 5), the phosphate concentration in the chemical solution is 10 g / L to 20 g / L, and the silicate concentration is 5 g / L to 15 g / L.

5. The heat-resistant steel surface treatment process according to claim 1, characterized in that: In step 6), the polishing process is performed by mechanical polishing or electrolytic polishing.

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