Titanium-containing high-entropy cladding alloy powder, corrosion-resistant laser cladding layer and preparation method of titanium-containing high-entropy cladding alloy powder

Abstract

The invention provides titanium-containing high-entropy cladding alloy powder, a corrosion-resistant laser cladding layer and a preparation method of the corrosion-resistant laser cladding layer, and belongs to the technical field of metal coatings. When the titanium-containing high-entropy cladding alloy powder provided by the invention is subjected to laser cladding, Ti in the titanium-containing high-entropy cladding alloy powder reacts with carbon in vanadium carbide to generate TiC, and a dispersion strengthening effect can be achieved, so that a laser cladding layer formed after the titanium-containing high-entropy cladding alloy is subjected to laser cladding has excellent corrosion resistance. Vanadium atoms in vanadium carbide are dissolved in the laser cladding layer, lattice distortion is caused, grains are refined, and the strength, hardness and corrosion resistance of the laser cladding layer are improved. The result of the embodiment shows that compared with FeCoCrNiTi high-entropy alloy powder, the titanium-containing high-entropy cladding alloy powder provided by the invention has the advantages that cracks of a laser cladding layer formed after laser cladding are obviously reduced, and the corrosion resistance is obviously improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal coatings, and particularly to a titanium-containing high-entropy cladding alloy powder, a corrosion-resistant laser cladding layer and a preparation method thereof. Background Art

[0002] Laser cladding is a process in which a high-energy laser beam irradiates to rapidly melt, react, and solidify a cladding alloy powder and the surface of a metal substrate to form a laser cladding layer with properties such as high hardness, wear resistance, and corrosion resistance. High-entropy alloys have properties such as high strength, high hardness, excellent wear resistance, and corrosion resistance. By laser cladding, a laser cladding layer with excellent properties can be formed, which is a material with great application potential in the field of ocean engineering materials.

[0003] Titanium-containing high-entropy cladding alloy powder, such as FeCoCrNiTi, is a typical high-entropy alloy, which is composed of five main elements, iron (Fe), cobalt (Co), chromium (Cr), nickel (Ni), and titanium (Ti), in an approximate equiatomic ratio or a specific ratio. However, the metal elements in the FeCoCrNiTi high-entropy alloy corresponding to the metal simple substances have poor stability and are prone to losing outer electrons and being corroded during seawater immersion. In addition, due to the inherent limitations of the preparation process, there are many cracks in the FeCoCrNiTi high-entropy alloy laser cladding coating. Under seawater immersion conditions, corrosive ions will rapidly penetrate into the interior of the cladding coating through these cracks and corrode the substrate, thereby reducing the corrosion resistance of the FeCoCrNiTi high-entropy alloy laser cladding layer. Therefore, although the FeCoCrNiTi high-entropy alloy has better mechanical properties and corrosion resistance compared with traditional cladding alloy powders, it still fails to meet the extremely high requirements for the performance of the laser cladding layer in the use environment of ocean engineering materials with strong corrosion. Summary of the Invention

[0004] The purpose of the present invention is to provide a titanium-containing high-entropy cladding alloy powder, a corrosion-resistant laser cladding layer and a preparation method thereof. The titanium-containing high-entropy cladding alloy powder provided by the present invention can obtain a laser cladding layer with high corrosion resistance after laser cladding.

[0005] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0006] The present invention provides a titanium-containing high-entropy cladding alloy powder, which, by mass percentage, includes: 75-95% of a titanium-containing high-entropy alloy powder and 5-25% of a vanadium carbide powder.

[0007] Preferably, the titanium-containing high-entropy alloy powder includes an FeCoCrNiTi high-entropy alloy powder, an FeCoNiAlTi high-entropy alloy powder or a CoCrNiAlTi high-entropy alloy powder.

[0008] Preferably, by mass percentage, the components of the FeCoCrNiTi high-entropy alloy powder include: Fe 18-22%, Cr 18-21%, Ni 18-21%, Co 19-22%, and Ti 17-18%.

[0009] Preferably, the particle size of the titanium-containing high-entropy alloy powder is 45-150 μm.

[0010] Preferably, the particle size of the vanadium carbide is 600-1000 nm.

[0011] The present invention also provides a method for preparing a corrosion-resistant laser cladding layer, comprising the following steps:

[0012] (1) Laying the titanium-containing high-entropy cladding alloy powder on the surface of a metal substrate to obtain a prefabricated powder layer; the titanium-containing high-entropy cladding alloy powder is the titanium-containing high-entropy cladding alloy powder described in the above technical solution;

[0013] (2) Performing laser cladding on the prefabricated powder layer obtained in step (1) to obtain a corrosion-resistant laser cladding layer.

[0014] Preferably, the material of the metal substrate in step (1) is steel.

[0015] Preferably, the thickness of the prefabricated powder layer in step (1) is 1.8-2.8 mm.

[0016] Preferably, the parameters of the laser cladding in step (2) include: laser power of 1800-2200 W; scanning rate of 300-800 mm / min; defocusing rate of +(4-6) mm; 40-60%; spot diameter of 2.2-2.8 mm; track spacing of 1-1.4 mm; protective gas is argon, and the flow rate of the protective gas is 3-8 L / min.

[0017] The present invention also provides a corrosion-resistant laser cladding layer prepared by the preparation method described in the above technical solution.

[0018] The present invention provides a titanium-containing high-entropy cladding alloy powder, which, by mass percentage, comprises: 75-95% of titanium-containing high-entropy alloy powder and 5-25% of vanadium carbide powder. When the titanium-containing high-entropy cladding alloy powder of the present invention is laser-clad, Ti in the titanium-containing high-entropy alloy powder can react with carbon in vanadium carbide to form TiC, achieving the effect of dispersion strengthening, so that the laser cladding layer formed after the titanium-containing high-entropy cladding alloy is laser-clad has excellent corrosion resistance. Vanadium atoms in vanadium carbide are dissolved in the laser cladding layer, causing lattice distortion and grain refinement, and improving the strength, hardness and corrosion resistance of the laser cladding layer. The results of the examples show that, compared with the FeCoCrNiTi high-entropy alloy powder, the titanium-containing high-entropy cladding alloy powder provided by the present invention has significantly reduced cracks in the formed laser cladding layer and significantly improved corrosion resistance after laser cladding. Description of the Drawings

[0019] Figure 1 Schematic diagram of the method for preparing a corrosion-resistant laser cladding layer provided by the present invention;

[0020] Figure 2 Linear polarization curves of the corrosion-resistant laser cladding layer prepared in Example 4 of the present invention and the laser cladding layer prepared in Comparative Example 2;

[0021] Figure 3 Nyquist diagrams of the corrosion-resistant laser cladding layer prepared in Example 4 of the present invention and the laser cladding layer prepared in Comparative Example 2;

[0022] Figure 4 Bode diagrams of the corrosion-resistant laser cladding layer prepared in Example 4 of the present invention and the laser cladding layer prepared in Comparative Example 2;

[0023] Figure 5 Phase angle diagrams of the corrosion-resistant laser cladding layer prepared in Example 4 of the present invention and the laser cladding layer prepared in Comparative Example 2;

[0024] Figure 6 Equivalent circuit diagrams of the corrosion-resistant laser cladding layer prepared in Example 4 of the present invention and the laser cladding layer prepared in Comparative Example 2;

[0025] Figure 7 Tafel polarization curves of the corrosion-resistant laser cladding layer prepared in Example 4 of the present invention and the laser cladding layer prepared in Comparative Example 2. Detailed Embodiments

[0026] The present invention provides a titanium-containing high-entropy cladding alloy powder, which, by mass percentage, comprises: 75-95% of titanium-containing high-entropy alloy powder and 5-25% of vanadium carbide powder.

[0027] By mass percentage, the titanium-containing high-entropy cladding alloy powder provided by the present invention comprises 75-95% of a titanium-containing high-entropy alloy powder. As an embodiment of the present invention, the mass percentage of the titanium-containing high-entropy alloy powder can be 75%, 80%, 85%, 90% or 95%. The present invention controls the mass percentage of the titanium-containing high-entropy alloy powder within the above range. As the main component of the titanium-containing high-entropy cladding alloy powder, it can quickly melt, react and solidify under laser cladding to form a laser cladding layer with high hardness, high wear resistance and corrosion resistance.

[0028] In the present invention, the titanium-containing high-entropy alloy powder preferably comprises an FeCoCrNiTi high-entropy alloy powder, an FeCoNiAlTi high-entropy alloy powder or a CoCrNiAlTi high-entropy alloy powder, and more preferably an FeCoCrNiTi high-entropy alloy powder. By adopting the above titanium-containing high-entropy alloy powder in the present invention, Ti in the titanium-containing high-entropy alloy powder can react with carbon in vanadium carbide to generate TiC, so that the laser cladding layer formed after the titanium-containing high-entropy cladding alloy is cladded has excellent corrosion resistance.

[0029] In the present invention, by mass percentage, the components of the FeCoCrNiTi high-entropy alloy powder preferably comprise: Fe 18-22%, Cr 18-21%, Ni 18-21%, Co 19-22% and Ti 17-18%, and more preferably Fe 20.64%, Cr 19.06%, Ni 21.45%, Co 21.3% and Ti 17.55%.

[0030] In the present invention, by mass percentage, the components of the FeCoNiAlTi high-entropy alloy powder preferably comprise: Fe 28.0%, Co 29.5%, Ni 27.5%, Al 8.5% and Ti 6.5%.

[0031] In the present invention, by mass percentage, the components of the CoCrNiAlTi high-entropy alloy powder preferably comprise: Co 16.86%, Cr 30.36%, Ni 31.81%, Al 6.88% and Ti 14.08%.

[0032] In the present invention, the particle size of the titanium-containing high-entropy alloy powder is preferably 45-150 μm. The present invention controls the particle size of the titanium-containing high-entropy alloy powder within the above range, which is more beneficial to improving the density, bonding strength, tissue uniformity and surface quality of the laser cladding layer.

[0033] By mass percentage, the titanium-containing high-entropy cladding alloy powder provided by the present invention comprises 5-25% of vanadium carbide powder. As an embodiment of the present invention, the mass percentage of the vanadium carbide powder can be 5%, 10%, 15%, 20% or 25%. By adding vanadium carbide powder, the present invention can react with Ti in the titanium-containing high-entropy alloy powder to generate TiC, achieving the effect of dispersion strengthening, so that the laser cladding layer formed after cladding the titanium-containing high-entropy cladding alloy has excellent corrosion resistance; the vanadium atoms in vanadium carbide are dissolved in the laser cladding layer, causing lattice distortion and grain refinement, and improving the strength, hardness and corrosion resistance of the laser cladding layer. The present invention controls the mass percentage of vanadium carbide powder within the above range, which can prevent the deterioration of the quality of the laser cladding layer caused by excessive use of vanadium carbide powder.

[0034] In the present invention, the particle size of the vanadium carbide is preferably 600-1000 nm, more preferably 800 nm. By controlling the particle size of vanadium carbide within the above range, the present invention has a large specific surface area, which is more conducive to being fully dispersed in the titanium-containing high-entropy alloy powder, fully reacting with the titanium-containing high-entropy alloy powder, and making the reaction products evenly dispersed in the laser cladding coating.

[0035] The present invention also provides a preparation method for the corrosion-resistant laser cladding layer described in the above technical solution, comprising the following steps:

[0036] (1) Lay the titanium-containing high-entropy cladding alloy powder on the surface of a metal substrate to obtain a prefabricated powder layer; the titanium-containing high-entropy cladding alloy powder is the titanium-containing high-entropy cladding alloy powder described in the above technical solution;

[0037] (2) Perform laser cladding on the prefabricated powder layer obtained in step (1) to obtain a corrosion-resistant laser cladding layer.

[0038] The present invention lays the titanium-containing high-entropy cladding alloy powder on the surface of a metal substrate to obtain a prefabricated powder layer.

[0039] In the present invention, the material of the metal substrate is preferably steel. In the embodiments of the present invention, the steel can be Q235B low-carbon steel. The present invention uses steel as the metal substrate, which is more suitable for the metal materials in ocean engineering, making the prepared corrosion-resistant laser cladding layer suitable for ocean engineering materials.

[0040] In the present invention, the titanium-containing high-entropy cladding alloy powder is the titanium-containing high-entropy cladding alloy powder described in the above technical solution, and will not be elaborated here.

[0041] The present invention has no special limitation on the preparation method of the titanium-containing high-entropy cladding alloy powder, and it is only necessary to mix the titanium-containing high-entropy alloy powder and vanadium carbide powder evenly.

[0042] The present invention does not particularly limit the laying method, and it is only necessary to form a prefabricated powder layer with a uniform thickness on the surface of the metal substrate from the titanium-containing high-entropy cladding alloy powder.

[0043] In the present invention, the thickness of the prefabricated powder layer is preferably 1.8 - 2.8 mm, more preferably 2 - 2.5 mm. By controlling the thickness of the prefabricated powder layer within the above range, the present invention is more conducive to forming a dense, flat and less defective corrosion laser cladding layer by laser cladding.

[0044] After obtaining the prefabricated powder layer, the present invention performs laser cladding on the prefabricated powder layer to obtain a corrosion-resistant laser cladding layer.

[0045] In the present invention, the parameters of the laser cladding preferably include: the laser power is preferably 1800 - 2200 W, more preferably 1800 - 2000 W; the scanning rate is preferably 300 - 800 mm / min, more preferably 500 - 600 mm / min; the defocusing rate is preferably +(4 - 6) mm, more preferably +5 mm; the overlapping rate is preferably 40 - 60%, more preferably 50%; the spot diameter is preferably 2.2 - 2.8 mm, more preferably 2 - 2.5 mm; the track pitch is preferably 1 - 1.4 mm, more preferably 1.2 mm; the protective gas is preferably argon, and the flow rate of the protective gas is preferably 3 - 8 L / min, more preferably 5 L / min. By controlling the parameters of the laser cladding within the above range, the present invention is more conducive to forming a dense, flat and less defective corrosion laser cladding layer.

[0046] The schematic diagram of the preparation method provided by the present invention is preferably as Figure 1 shown. As can be seen from Figure 1 , the present invention lays the composite powder (i.e., the titanium-containing high-entropy cladding alloy powder) on the substrate, and under the protection of argon, through the laser beam and laser cladding, the laser cladding layer can be obtained. The preparation method provided by the present invention is simple and easy to control, and can obtain a dense, flat and less defective corrosion-resistant laser cladding layer.

[0047] The present invention also provides a corrosion-resistant laser cladding layer prepared by the preparation method described in the above technical solution.

[0048] The corrosion-resistant laser cladding layer provided by the present invention includes a titanium-containing high-entropy alloy cladding layer and TiC dispersed in the titanium-containing high-entropy alloy cladding layer. TiC can play a role in dispersion strengthening, so that the laser cladding layer formed after melting the titanium-containing high-entropy cladding alloy has excellent corrosion resistance. Vanadium atoms in vanadium carbide are dissolved in the laser cladding layer, causing lattice distortion and grain refinement, and improving the strength, hardness and corrosion resistance of the laser cladding layer.

[0049] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the embodiments in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts belong to the scope of protection of the present invention.

[0050] Example 1

[0051] A titanium-containing high-entropy cladding alloy powder, by mass percentage, is: 85% of FeCoCrNiTi high-entropy alloy powder and 15% of vanadium carbide powder;

[0052] Among them, the components of the FeCoCrNiTi high-entropy alloy powder are: Fe 20.64%, Cr 19.06%, Ni 21.45%, Co 21.3% and Ti 17.55%; the particle size of the FeCoCrNiTi high-entropy alloy powder is 45 - 150 μm;

[0053] The particle size of the vanadium carbide powder is 800 nm;

[0054] The preparation method of the titanium-containing high-entropy cladding alloy powder is: mixing the FeCoCrNiTi high-entropy alloy powder and the vanadium carbide powder evenly to obtain it.

[0055] Example 2

[0056] A titanium-containing high-entropy cladding alloy powder, by mass percentage, is: 85% of FeCoCrNiTi high-entropy alloy powder and 15% of vanadium carbide powder;

[0057] Among them, the components of the FeCoCrNiTi high-entropy alloy powder are: Fe 20.46%, Cr 19.81%, Ni 21.24%, Co 20.96% and Ti 17.53%; the particle size of the FeCoCrNiTi high-entropy alloy powder is 45 - 150 μm;

[0058] The particle size of the vanadium carbide powder is 800 nm.

[0059] Example 3

[0060] A titanium-containing high-entropy cladding alloy powder, by mass percentage, is: 85% of FeCoCrNiTi high-entropy alloy powder and 15% of vanadium carbide powder;

[0061] Among them, the components of the FeCoCrNiTi high-entropy alloy powder are: Fe 21.2%, Cr 20.62%, Ni 20.46%, Co 19.42% and Ti 18.3%; the particle size of the FeCoCrNiTi high-entropy alloy powder is 45 - 150 μm;

[0062] The particle size of the vanadium carbide powder is 800 nm.

[0063] Example 4

[0064] A method for preparing a corrosion-resistant laser cladding layer, the steps are as follows:

[0065] (1) Lay the titanium-containing high-entropy cladding alloy powder in Example 1 on the surface of a metal substrate (Q235B low-carbon steel) to obtain a prefabricated powder layer with a thickness of 2 mm;

[0066] (2) Perform laser cladding on the prefabricated powder layer obtained in step (1). The parameters of the laser cladding are: laser power is 1800 W, scanning speed is 500 mm / min, defocus ratio is +5 mm, overlap ratio is 50%, spot diameter is 2.5 mm, track spacing: 1.2 mm. Argon is used as the shielding gas, and the flow rate of argon is 5 L / min; a corrosion-resistant laser cladding layer is obtained.

[0067] Comparative Example 1

[0068] A titanium-containing high-entropy cladding alloy powder, by mass percentage, is: FeCoCrNiTi high-entropy alloy powder; the components of the FeCoCrNiTi high-entropy alloy powder are: Fe 20.64%, Cr 19.06%, Ni 21.45%, Co 21.3% and Ti 17.55%;

[0069] The particle size of the FeCoCrNiTi high-entropy alloy powder is 45 - 150 μm.

[0070] Comparative Example 2

[0071] A method for preparing a laser cladding layer, the steps are as follows:

[0072] (1) Lay the titanium-containing high-entropy cladding alloy powder in Comparative Example 1 on the surface of a metal substrate to obtain a prefabricated powder layer with a thickness of 2 mm;

[0073] (2) Perform laser cladding on the prefabricated powder layer obtained in step (1). The parameters of the laser cladding are: laser power is 1800 W, scanning speed is 500 mm / min, defocus ratio is +5 mm, overlap ratio is 50%, spot diameter is 2.5 mm, track spacing: 1.2 mm. Argon is used as the shielding gas, and the flow rate of argon is 5 L / min; a laser cladding layer is obtained.

[0074] Test Example

[0075] Using an electrochemical workstation (model CS350M, Corrtest, Wuhan, China), the three-electrode method was adopted at room temperature (working electrode: laser cladding layer prepared in Example 4 or Comparative Example 2, reference electrode: saturated calomel electrode, auxiliary electrode: platinum sheet). The experimental solution concentration was 3.5 wt.% NaCl. Before the test, the corrosion-resistant laser cladding layer prepared in Example 4 and the laser cladding layer prepared in Comparative Example 2 were made into samples according to the standard size of 1 mm × 1 mm; then the samples were immersed in 3.5 wt.% NaCl solution for 10 h to stabilize the self-corrosion potential. Linear polarization curves were obtained at an initial potential of 0.01 V (relative to OCP), 0.01 V (relative to OCP), and a scanning rate of 0.167 mV / s, as shown in Figure 2 ; Nyquist diagrams were obtained by detecting the samples at a frequency of 10 -1 ~10 5 Hz, as shown in Figure 3 , Bode plots as shown in Figure 4 , phase angle diagrams as shown in Figure 5 , and equivalent circuit diagrams as shown in Figure 6 ; Tafel polarization curves of the samples were tested in the scanning range of -0.5 V to 1.5 V and at a scanning speed of 0.01 V / s, as shown in Figure 7 .

[0076] It can be seen from Figure 2 that the OCP of the corrosion-resistant laser cladding layer prepared in Example 4 was -0.08764 ± 0.003; the OCP of the laser cladding layer prepared in Comparative Example 2 was -0.39373 ± 0.006.

[0077] It can be seen from Figure 3 that after adding vanadium carbide, the capacitance arc radius of the laser cladding layer is larger and the surface corrosion resistance is better; Figures 4 - 5 shows the Bode plot and phase angle diagram of the coating. The impedance modulus |Z| reflects the corrosion resistance of the material in the Bode plot, and the phase angle is used to analyze and predict the ability to prevent electrolyte penetration. The larger the |Z| value and phase angle, the stronger the corrosion resistance of the material and the more difficult it is for the electrolyte to penetrate; it can be seen from Figures 4 - 5 that after adding vanadium carbide, the corrosion resistance of the laser cladding layer is significantly improved; Figure 6 shows the equivalent circuit diagram;

[0078] Figure 6 (d1) shows that the CoCrFeNiTi laser cladding layer has a porous structure and exhibits non-ideal capacitive behavior, Figure 6 (d2) is used to describe the electrochemical reaction at the passive film / electrolyte interface and is generally considered to be a complete passive film.

[0079] It can be seen from Figure 7Among them, CoCrFeNiTi is the Tafel polarization curve of the laser cladding layer prepared in Comparative Example 2; CoCrFeNiTi + 15% VC is the Tafel polarization curve of the corrosion-resistant laser cladding layer prepared in Example 4.

[0080] Table 1 Tafel performance test results and coating macroscopic morphologies of the laser cladding layers prepared in Example 4 and Comparative Example 2

[0081]

[0082]

[0083] Table 2 Sample parameter values obtained from the electrochemical equivalent circuit EIS of the laser cladding layers prepared in Example 4 and Comparative Example 2

[0084]

[0085] As can be seen from Table 1, Table 2, Figures 2 - 7 it can be known that the corrosion-resistant laser cladding layer obtained by the method of the present invention has more excellent corrosion resistance, and the cracks are significantly reduced. This is because when the titanium-containing high-entropy cladding alloy powder provided by the present invention is laser-cladded, Ti in the titanium-containing high-entropy alloy powder can react with carbon in vanadium carbide to form TiC, which can play a dispersion strengthening effect, so that the laser cladding layer formed after the titanium-containing high-entropy cladding alloy is cladded has excellent corrosion resistance. Vanadium atoms in vanadium carbide are dissolved in the laser cladding layer, causing lattice distortion and grain refinement, and improving the strength, hardness and corrosion resistance of the laser cladding layer.

[0086] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A titanium-containing high-entropy cladding alloy powder, by mass percentage, includes: 75 - 95% of titanium-containing high-entropy alloy powder and 5 - 25% of vanadium carbide powder.

2. The titanium-containing high-entropy cladding alloy powder according to claim 1, wherein The titanium-containing high-entropy alloy powder includes FeCoCrNiTi high-entropy alloy powder, FeCoNiAlTi high-entropy alloy powder or CoCrNiAlTi high-entropy alloy powder.

3. The titanium-containing high-entropy cladding alloy powder according to claim 2, characterized in that, By mass percentage, the components of the FeCoCrNiTi high-entropy alloy powder include: Fe 18 - 22%, Cr 18 - 21%, Ni 18 - 21%, Co 19 - 22% and Ti 17 - 18%.

4. The titanium-containing high-entropy cladding alloy powder according to any one of claims 1 to 3, characterized in that The particle size of the titanium-containing high-entropy alloy powder is 45 - 150 μm.

5. The titanium-containing high-entropy cladding alloy powder according to claim 1, wherein, The particle size of the vanadium carbide is 600 - 1000 nm.

6. A method for preparing a corrosion-resistant laser cladding layer, comprising the following steps: (1) Laying the titanium-containing high-entropy cladding alloy powder on the surface of a metal substrate to obtain a prefabricated powder layer; the titanium-containing high-entropy cladding alloy powder is the titanium-containing high-entropy cladding alloy powder according to any one of claims 1 - 5; (2) Performing laser cladding on the prefabricated powder layer obtained in step (1) to obtain a corrosion-resistant laser cladding layer.

7. The preparation method according to claim 6, characterized in that, In step (1), the material of the metal substrate is steel.

8. The preparation method according to claim 6, characterized in that, In step (1), the thickness of the prefabricated powder layer is 1.8 - 2.8 mm.

9. The preparation method according to claim 6, wherein In step (2), the parameters of the laser cladding include: laser power is 1800 - 2200 W; scanning speed is 300 - 800 mm / min; defocusing rate is +(4 - 6) mm; overlapping rate is 40 - 60%; spot diameter is 2.2 - 2.8 mm; track pitch is 1 - 1.4 mm; the shielding gas is argon, and the flow rate of the shielding gas is 3 - 8 L / min.

10. The corrosion-resistant laser cladding layer prepared by the preparation method according to any one of claims 6 - 9.

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