High-strength-toughness corrosion-resistant gradient high-entropy alloy coating for shaft surface and integrated preparation method of high-strength-toughness corrosion-resistant gradient high-entropy alloy coating

Abstract

The invention relates to the technical field of material surface modification, and particularly discloses a high-toughness corrosion-resistant gradient high-entropy alloy coating for shaft surfaces and an integrated preparation method. The high-entropy alloy coating comprises any five kinds of metal of Al, Co, Cr, Fe, Ni, Mn, Cu and Ti, and the atomic percent of the five kinds of metal is 1: 1: 1: 1: 1. The raw materials are mixed and smelted according to the proportion, alloy liquid is obtained, the alloy liquid is atomized, and alloy powder is obtained; alloy powder is conveyed to the surface of the shaft type base body through a powder feeding device, laser cladding is continuously carried out, an initial cladding layer is formed on the surface of the shaft type base body, cylindrical turning and ultrasonic rolling treatment are continuously carried out on the initial cladding layer, and the high-toughness corrosion-resistant gradient high-entropy alloy coating is formed on the surface of the shaft type base body. The gradient performance of the coating is regulated and controlled, the bonding strength and comprehensive performance of the coating and the matrix are improved, and the process steps are simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material surface modification, in particular to a high-strength and high-toughness corrosion-resistant gradient high-entropy alloy coating for shaft surface and an integrated preparation method. BACKGROUND

[0002] Shaft parts are widely used in aerospace, ship, automobile, machine tool and other fields as key components of mechanical equipment. The working environment of shaft parts is often harsh, and they need to withstand large loads, friction and corrosion of corrosive media. Therefore, the performance requirements of the surface of shaft parts are extremely high, not only high strength and toughness, but also excellent corrosion resistance.

[0003] At present, in order to improve the surface performance of shaft parts, surface coating technology is often used. The coating materials in related technologies, such as ordinary alloy coating, are difficult to meet the increasingly stringent use requirements in terms of strength, toughness and corrosion resistance. In addition, the preparation and subsequent processing of existing coatings are usually carried out in steps, which not only is complicated, but also may affect the dimensional accuracy and performance stability of the coating due to secondary clamping and other factors. High-entropy alloys have excellent mechanical properties and corrosion resistance due to their unique "high-entropy effect" and "slow diffusion effect". If high-entropy alloys are applied to the coating materials of shaft parts, it is of great significance to improve the service life and reliability of shaft parts.

[0004] However, the current preparation methods of high-entropy alloy coating are mostly single processes, which are difficult to realize gradient performance regulation, and there are still deficiencies in the bonding strength between the coating and the substrate, the matching of the strength and toughness of the coating itself, etc. Therefore, it is necessary to develop a method that can prepare a high-strength and high-toughness corrosion-resistant gradient metastable high-entropy alloy coating and realize the integration of preparation and processing. SUMMARY

[0005] In order to improve the performance of the existing shaft surface coating, simplify the preparation and processing procedures, realize the gradient performance regulation of the coating, improve the bonding strength and comprehensive performance of the coating and the substrate, and simplify the process steps, the present application provides a high-strength and high-toughness corrosion-resistant gradient high-entropy alloy coating for shaft surface and an integrated preparation method.

[0006] In the first aspect, the present application provides a high-strength and high-toughness corrosion-resistant gradient high-entropy alloy coating for shaft surface, which adopts the following technical scheme: A high-strength and high-toughness corrosion-resistant gradient high-entropy alloy coating for shaft surface, the composition of the high-entropy alloy coating is any 5 kinds of Al, Co, Cr, Fe, Ni, Mn, Cu and Ti, and the atomic percentage is 1:1:1:1:1.

[0007] Secondly, this application provides a method for preparing a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating for shaft surfaces, which employs the following technical solution: A method for preparing a high-strength, high-toughness, corrosion-resistant gradient high-entropy alloy coating for shaft surfaces includes the following steps: Atomization powder production: According to the formula, metal raw materials are mixed and smelted to obtain alloy liquid, and the alloy liquid is atomized to obtain alloy powder; Coating process: Alloy powder is fed to the surface of the shaft substrate through a powder feeding device and laser cladding is performed continuously to form an initial cladding layer on the surface of the shaft substrate. The initial cladding layer is then continuously machined by external turning and ultrasonic rolling to form a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the surface of the shaft substrate.

[0008] In one specific implementation, the atomization powder preparation step is carried out under the action of an inert gas at a pressure of 3-6 MPa.

[0009] In one specific implementation, the temperature of the alloy liquid in the atomization powder preparation step is 1500-1700℃.

[0010] In one specific implementation, the particle size of the alloy powder in the atomization powder preparation step is 50-200 μm.

[0011] In one specific implementation scheme, the laser cladding process parameters are: laser power 1800-3000W, scanning speed 5-15mm / min, spot diameter 2-4mm, and powder feeding rate 8-20g / min.

[0012] In one specific implementation scheme, the process parameters for the external cylindrical turning are: cutting speed 80-150 m / min, feed rate 0.1-0.3 mm / r, and depth of cut 0.1-0.5 mm.

[0013] In one specific implementation, the cutting tool used for external cylindrical turning is a WC-Co based cemented carbide with a TiAlN coating on its surface.

[0014] In one specific implementation, the process parameters for ultrasonic rolling are: ultrasonic frequency 15-30kHz, rolling force 500-1500N, and feed speed matching the laser cladding scanning speed.

[0015] In one specific feasible implementation, the surface of the shaft-type parts substrate is pretreated as follows: oil, rust and oxide scale are removed from the surface of the shaft-type parts substrate; the surface of the shaft-type parts substrate is sanded or sandblasted; the surface of the shaft-type parts substrate is then cleaned with alcohol or acetone and dried to complete the pretreatment.

[0016] In summary, this application has the following beneficial effects: 1. This application utilizes a high-entropy alloy with any five combinations of Al, Co, Cr, Fe, Ni, Mn, Cu, and Ti as the coating material, with an atomic percentage of 1:1:1:1:1. Through the synergistic effect of a process combining laser cladding with a defined gradient, machining to remove defects, and ultrasonic rolling for strength optimization, a high-strength, tough, and corrosion-resistant gradient high-entropy alloy coating for shaft surfaces is prepared. This helps improve the bonding strength and hardness of the alloy coating, and addresses the shortcomings of existing shaft surface coatings, such as insufficient performance and cumbersome preparation and processing procedures. It enables gradient performance control of the coating, improves the bonding strength and overall performance between the coating and the substrate, and simplifies the process steps. Attached Figure Description

[0017] Fig. 1 This is a schematic diagram of the preparation method of a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the surface of a shaft according to Embodiment 1 of this application.

[0018] Fig. 2 This is a schematic diagram showing the distribution of the microstructure from the surface to the interior of the high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the shaft surface of Embodiment 1 of this application. Detailed Implementation

[0019] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0020] Example Example 1 like Figs. 1-2 As shown, this embodiment provides a high-strength, high-toughness, corrosion-resistant gradient high-entropy alloy coating for shaft surfaces. The composition of the high-entropy alloy coating is AlCoCrFeNi, with an atomic percentage of 1:1:1:1:1.

[0021] This embodiment also provides a method for preparing a high-strength, high-toughness, corrosion-resistant gradient high-entropy alloy coating for shaft surfaces, comprising the following steps: According to the atomic ratio of high-entropy alloys, five metallic raw materials with a purity of 99.9%—Al, Co, Cr, Fe, and Ni—were weighed and placed in a vacuum induction melting furnace at a vacuum degree of 5 × 10⁻⁶. -3 The alloy was melted at 1600℃ under the condition of Pa to obtain a uniform alloy liquid. The alloy liquid was introduced into an atomizing device and atomized under the action of nitrogen gas at a pressure of 4 MPa. The atomized powder was collected and sieved to obtain alloy powder with a particle size between 80-150 μm.

[0022] Select a 45 steel shaft with a diameter of 50mm and a length of 300mm as the shaft base. First, use sandpaper to polish and remove the rust from the surface of the shaft base. Then, use sandpaper with 80-mesh abrasive to sandblast the surface of the shaft base. After that, use alcohol to ultrasonically clean for 15 minutes and dry it for later use.

[0023] The pre-treated shaft parts are mounted on a rotary table, and the equipment is started, rotating the shaft substrate at 200 r / min. Alloy powder is fed onto the shaft substrate surface via a powder feeding device. The laser cladding equipment is adjusted, setting the laser power to 2200 W, scanning speed to 10 mm / min, spot diameter to 3 mm, and powder feeding rate to 12 g / min, continuously performing laser cladding to form an initial cladding layer on the shaft substrate surface. A WC-Co based carbide tool with a TiAlN coating is selected, setting the cutting speed to 100 m / min, feed rate to 0.2 mm / r, and depth of cut to 0.3 mm, continuously turning the initial cladding layer. Immediately after turning, an ultrasonic rolling device is started, setting the ultrasonic frequency to 20 kHz and the rolling force to 800 N, continuously ultrasonically rolling the turned coating surface to form a 1.2 mm thick high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the shaft substrate surface.

[0024] Example 2 The only difference between this embodiment and Embodiment 1 is that in the method for preparing a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the surface of shafts, the alloy liquid is introduced into an atomizing device and atomized under the action of nitrogen gas at a pressure of 5 MPa. The atomized powder is collected and sieved to obtain alloy powder with a particle size between 50-120 μm.

[0025] Example 3 The only difference between this embodiment and Embodiment 1 is that in the method for preparing a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the surface of shafts, the alloy liquid is introduced into an atomizing device and atomized under the action of nitrogen gas at a pressure of 3 MPa. The atomized powder is collected and sieved to obtain alloy powder with a particle size between 100-200 μm.

[0026] Example 4 The only difference between this embodiment and Embodiment 1 is that in the method for preparing a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the surface of shafts, the alloy liquid is introduced into an atomizing device and atomized under the action of nitrogen gas at a pressure of 6 MPa. The atomized powder is collected and sieved to obtain alloy powder with a particle size between 120-200 μm.

[0027] Example 5 The only difference between this embodiment and Embodiment 1 is that, in the preparation method of the high-strength, high-toughness, corrosion-resistant gradient high-entropy alloy coating on the shaft surface, five metal raw materials with a purity of 99.9% are weighed according to the atomic ratio of the high-entropy alloy and placed in a vacuum induction melting furnace at a vacuum degree of 5×10⁻⁶. -3 Melt to 1500℃ under Pa conditions to obtain a homogeneous alloy liquid.

[0028] Example 6 The only difference between this embodiment and Embodiment 1 is that, in the preparation method of the high-strength, high-toughness, corrosion-resistant gradient high-entropy alloy coating on the shaft surface, five metal raw materials with a purity of 99.9% are weighed according to the atomic ratio of the high-entropy alloy and placed in a vacuum induction melting furnace at a vacuum degree of 5×10⁻⁶. -3 Melt to 1700℃ under Pa conditions to obtain a homogeneous alloy liquid.

[0029] Example 7 The only difference between this embodiment and Embodiment 1 is that in the preparation method of the high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the surface of the shaft, the alloy powder is transported to the surface of the shaft substrate through a powder feeding device, and the laser cladding equipment is adjusted with a laser power of 2500W, a scanning speed of 8mm / min, a spot diameter of 2.5mm, and a powder feeding rate of 15g / min to continuously perform laser cladding and form an initial cladding layer on the surface of the shaft substrate.

[0030] Example 8 The only difference between this embodiment and Embodiment 1 is that in the preparation method of the high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the surface of the shaft, the alloy powder is transported to the surface of the shaft substrate through a powder feeding device, and the laser cladding equipment is adjusted with a laser power of 1800W, a scanning speed of 5mm / min, a spot diameter of 2mm, and a powder feeding rate of 8g / min to continuously perform laser cladding and form an initial cladding layer on the surface of the shaft substrate.

[0031] Example 9 The only difference between this embodiment and Embodiment 1 is that in the preparation method of the high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the surface of the shaft, the alloy powder is transported to the surface of the shaft substrate through a powder feeding device, and the laser cladding equipment is adjusted with a laser power of 3000W, a scanning speed of 15mm / min, a spot diameter of 4mm, and a powder feeding rate of 20g / min to continuously perform laser cladding and form an initial cladding layer on the surface of the shaft substrate.

[0032] Example 10 The only difference between this embodiment and Embodiment 1 is that, in the method for preparing a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the shaft surface, a WC-Co-based cemented carbide tool with a TiAlN coating is selected, the cutting speed is set to 120 m / min, the feed rate is 0.15 mm / r, the depth of cut is 0.2 mm, and the initial cladding layer is continuously machined by external turning.

[0033] Example 11 The only difference between this embodiment and Embodiment 1 is that, in the method for preparing a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the shaft surface, a WC-Co-based cemented carbide tool with a TiAlN coating is selected, the cutting speed is set to 80 m / min, the feed rate is 0.1 mm / r, the depth of cut is 0.1 mm, and the initial cladding layer is continuously machined by external turning.

[0034] Example 12 The only difference between this embodiment and Embodiment 1 is that, in the method for preparing a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the shaft surface, a WC-Co-based cemented carbide tool with a TiAlN coating is selected, the cutting speed is set to 150 m / min, the feed rate is 0.3 mm / r, the depth of cut is 0.5 mm, and the initial cladding layer is continuously machined by external turning.

[0035] Example 13 The only difference between this embodiment and Embodiment 1 is that, in the method for preparing a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the surface of a shaft, an ultrasonic rolling device is immediately started after turning, with an ultrasonic frequency of 25kHz and a rolling force of 1000N, and the turned coating surface is continuously subjected to ultrasonic rolling treatment to form a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating with a thickness of 1.2mm on the surface of the shaft substrate.

[0036] Example 14 The only difference between this embodiment and Embodiment 1 is that, in the method for preparing a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the surface of a shaft, an ultrasonic rolling device is immediately started after turning, with an ultrasonic frequency of 15kHz and a rolling force of 500N, and the coated surface after turning is continuously subjected to ultrasonic rolling treatment to form a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating with a thickness of 1.2mm on the surface of the shaft substrate.

[0037] Example 15 The only difference between this embodiment and Embodiment 1 is that, in the method for preparing a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the surface of a shaft, an ultrasonic rolling device is immediately started after turning, with an ultrasonic frequency of 30kHz and a rolling force of 1500N, and the coated surface after turning is continuously subjected to ultrasonic rolling treatment to form a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating with a thickness of 1.2mm on the surface of the shaft substrate.

[0038] Example 16 The only difference between this embodiment and Embodiment 1 is that a 40Cr steel shaft with a diameter of 60mm and a length of 400mm is selected as the shaft base.

[0039] Example 17 The only difference between this embodiment and Embodiment 1 is that a 20 steel shaft with a diameter of 40mm and a length of 250mm is selected as the shaft base.

[0040] Comparative Example Comparative Example 1 The only difference between this comparative example and Example 1 is that the shaft surface in this comparative example is coated with a high-strength, high-toughness, corrosion-resistant gradient high-entropy alloy, with the following alloy composition: Co, Cr, Ni. In the preparation method of the high-strength, high-toughness, corrosion-resistant gradient high-entropy alloy coating on the shaft surface, Co, Cr, and Ni raw materials with a purity of 99.9% are weighed according to an atomic ratio of 1:1:1 and placed in a vacuum induction melting furnace at a vacuum degree of 5 × 10⁻⁶. -3 Melt to 1600℃ under Pa conditions to obtain a homogeneous alloy liquid.

[0041] Comparative Example 2 The only difference between this comparative example and Example 1 is that the shaft surface in this comparative example is coated with a high-strength, high-toughness, corrosion-resistant gradient high-entropy alloy, with the following alloy composition: FeCoNi. In the preparation method of the high-strength, high-toughness, corrosion-resistant gradient high-entropy alloy coating on the shaft surface, Fe, Co, and Ni raw materials with a purity of 99.9% are weighed according to an atomic ratio of 1:1:1 and placed in a vacuum induction melting furnace at a vacuum degree of 5×10⁻⁶. -3 Melt to 1600℃ under Pa conditions to obtain a homogeneous alloy liquid.

[0042] Comparative Example 3 The only difference between this comparative example and Example 1 is that the shaft surface in this comparative example is coated with a high-strength, tough, corrosion-resistant gradient high-entropy alloy with the following alloy composition: FeCrNi. In the preparation method of the high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the shaft surface, Fe, Cr, and Ni raw materials with a purity of 99.9% are weighed according to an atomic ratio of 1:1:1 and placed in a vacuum induction melting furnace at a vacuum degree of 5×10⁻⁶. -3 Melt to 1600℃ under Pa conditions to obtain a homogeneous alloy liquid.

[0043] Performance testing For Examples 1-17 and Comparative Examples 1-3, the following performance tests were performed: base layer hardness (HV) and surface layer hardness (HV) of the coating; specific steps: cut the cross-section of the cladding layer, grind and polish and etch the exposed layer, use a Vickers hardness tester to test at points on the cladding layer, heat-affected zone and substrate according to the corresponding load, record the indentation data and take the average value (for specific test methods, refer to GB / T4340.1-2009).

[0044] Tensile test: to obtain the bond strength (MPa) between the coating and the shaft substrate. Specific test procedure: After the coating is clad onto the substrate, it is bonded and cured with another specimen to form a standard tensile specimen. A universal testing machine is used to uniformly load the specimen until it breaks. The maximum load is recorded, the bond strength is calculated, and the average value is taken (for specific test methods, refer to GB / T 16594-2008).

[0045] Electrochemical corrosion test: The test was conducted in a 3.5% NaCl solution to obtain the corrosion current density of the coating (A / cm). 2 ); Specific test steps: Seal the non-test surface of the sample, immerse it in a 3.5% NaCl solution using a three-electrode system, stabilize the open-circuit potential, scan the polarization curve, and obtain the corrosion current density by Tafel fitting. (For specific test methods, refer to GB / T17899-1999).

[0046] The test results are shown in Table 1.

[0047] Table 1 As can be seen from Example 1 and Comparative Examples 1-3, and Table 1, compared to Example 1, the coatings of Comparative Examples 1-3 have lower base layer hardness, surface layer hardness, and bonding strength, while exhibiting higher corrosion current density. This indicates that using the raw material ratio and preparation method of Example 1 helps to improve the bonding strength and hardness of the alloy coating, and enhances its corrosion resistance. Moreover, the hardness of the coating gradually increases from the base layer to the surface, achieving gradient control.

[0048] This may be because the AlCoCrFeNi gradient high-entropy alloy coating prepared in Example 1, through the synergistic effect of "laser cladding to fix the gradient + turning to remove defects + ultrasonic rolling to optimize strength", not only maintains the gradient characteristics of gradually increasing strength and hardness from the base layer to the surface layer, but also, due to the uniform effect of ultrasonic rolling on the flat surface, makes the residual compressive stress distribution more reasonable and the surface grains more refined. Compared with the original sequence, the corrosion resistance and impact toughness of the coating are further optimized, fully meeting the performance requirements of different parts of shaft parts.

[0049] The coating bonds more firmly to the substrate: the laser cladding process enables the coating to form a good metallurgical bond with the substrate; the pretreatment improves the surface activity of the substrate, and the subsequent turning does not damage the coating-substrate interface. Ultrasonic rolling can also promote micro-diffusion at the coating-substrate interface through mechanical vibration, further enhancing the bonding strength and effectively preventing the coating from falling off.

[0050] The integrated process is highly efficient and stable: The integrated process reduces the number of steps and clamping times, which can improve production efficiency; at the same time, the optimized sequence of "turning first and then ultrasonic rolling" avoids secondary clamping errors and repairs minor damage from turning through ultrasonic rolling, thereby improving the dimensional accuracy and performance stability of the coating.

[0051] As can be seen from Examples 1-17 and Table 1, the coatings of Examples 1-17 exhibit lower base layer hardness, surface hardness, and bonding strength, while possessing higher corrosion current densities. This indicates that the raw material ratios and preparation methods of Examples 1-17 contribute to improving the bonding strength and hardness of the alloy coating and enhancing its corrosion resistance. Therefore, the raw material ratios and preparation methods of this application contribute to improving the bonding strength and hardness of the alloy coating, addressing the shortcomings of existing shaft surface coatings in terms of performance, cumbersome preparation and processing procedures, achieving gradient performance control of the coating, improving the bonding strength and overall performance between the coating and the substrate, and simplifying the process steps.

[0052] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-strength, high-toughness, corrosion-resistant gradient high-entropy alloy coating for shaft surfaces, characterized in that, It includes any five metals selected from Al, Co, Cr, Fe, Ni, Mn, Cu, and Ti, with the atomic percentages of the five metals being 1:1:1:1:

1.

2. A method for preparing a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating for shaft surfaces according to claim 1, characterized in that, Includes the following steps: Atomization powder production: According to the formula, metal raw materials are mixed and smelted to obtain alloy liquid, and the alloy liquid is atomized to obtain alloy powder; Coating process: Alloy powder is fed to the surface of the shaft substrate through a powder feeding device and laser cladding is performed continuously to form an initial cladding layer on the surface of the shaft substrate. The initial cladding layer is then continuously machined by external turning and ultrasonic rolling to form a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating on the surface of the shaft substrate.

3. The method for preparing a high-strength, high-toughness, corrosion-resistant gradient high-entropy alloy coating for shaft surfaces according to claim 2, characterized in that, In the atomization powder preparation step, atomization is carried out under the action of an inert gas at a pressure of 3-6 MPa.

4. The method for preparing a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating for shaft surfaces according to claim 3, characterized in that, In the atomization powder preparation step, the temperature of the alloy liquid is 1500-1700℃.

5. The method for preparing a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating for shaft surfaces according to claim 4, characterized in that, In the atomization powder preparation step, the particle size of the alloy powder is 50-200μm.

6. The method for preparing a high-strength, tough, corrosion-resistant gradient high-entropy alloy coating for shaft surfaces according to claim 5, characterized in that, The laser cladding process parameters are: laser power 1800-3000W, scanning speed 5-15mm / min, spot diameter 2-4mm, and powder feeding rate 8-20g / min.

7. The method for preparing a high-strength, high-toughness, corrosion-resistant gradient high-entropy alloy coating for shaft surfaces according to claim 2, characterized in that, The process parameters for the external cylindrical turning are: cutting speed 80-150m / min, feed rate 0.1-0.3mm / r, and depth of cut 0.1-0.5mm.

8. The method for preparing a high-strength, high-toughness, corrosion-resistant gradient high-entropy alloy coating for shaft surfaces according to claim 7, characterized in that, The cutting tool used for external cylindrical turning is a WC-Co based cemented carbide with a TiAlN coating on its surface.

9. The method for preparing a high-strength, high-toughness, corrosion-resistant gradient high-entropy alloy coating for shaft surfaces according to claim 2, characterized in that, The process parameters for ultrasonic rolling are: ultrasonic frequency 15-30kHz, rolling force 500-1500N, and feed speed matching the laser cladding scanning speed.

10. The method for preparing a high-strength, high-toughness, corrosion-resistant gradient high-entropy alloy coating for shaft surfaces according to claim 2, characterized in that, The following pretreatment is performed on the surface of the shaft-type parts: remove oil, rust and oxide scale from the surface of the shaft-type parts, sand or blast the surface of the shaft-type parts, clean the surface of the shaft-type parts with alcohol or acetone, and dry it to complete the pretreatment.

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