Corrosion-resistant aluminum alloy profile and method for producing the same

Abstract

The application discloses a kind of corrosion-resistant aluminum alloy profiles and preparation method thereof, belong to aluminum alloy profile technical field.The application can ensure the strength of aluminum alloy profile by optimizing the composition of corrosion-resistant aluminum alloy, and has a positive effect on the corrosion resistance of aluminum alloy profile.In addition, the application forms a corrosion-resistant coating on the surface of the corrosion-resistant aluminum alloy substrate by laser cladding, which can significantly improve the corrosion resistance of the aluminum alloy profile while ensuring the application performance of the aluminum alloy profile.In the corrosion-resistant coating, nickel powder can enhance the resistance to pitting and intergranular corrosion, and improve the adhesion to the aluminum alloy substrate.Boron nitride can improve the surface acid resistance and wear resistance of the aluminum alloy profile, and block the corrosion channel.Lanthanum oxide and cerium dioxide have a synergistic effect, which can refine the surface grains, reduce the pores generated during the cladding process, improve the compactness of the coating, promote the compatibility with the aluminum alloy substrate, and ensure the appearance quality of the aluminum alloy profile.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy preparation, and more specifically, to a corrosion-resistant aluminum alloy profile and its preparation method. Background Technology

[0002] Aluminum alloy profiles possess advantages such as low specific gravity, high strength, excellent machinability, high specific strength, and good corrosion resistance, making them widely used in aerospace and other defense industries. They are currently one of the main structural materials in the aerospace industry. With the increasing demands for long service life and low cost in aerospace applications, the requirements for structural materials are also constantly rising. Ultra-high strength aluminum alloys, with their superior comprehensive performance and high specific strength, have gained widespread application. Traditional manufacturing processes include extrusion, rolling, and heat treatment to obtain aluminum alloy materials with good corrosion resistance.

[0003] Existing technologies also include increasing the content of Zn, Mg, and Cu alloying elements to enhance precipitation strengthening and significantly improve alloy strength. However, this increased strength leads to a decrease in the alloy's ductility, toughness, and corrosion resistance. Consequently, in complex environments, traditional corrosion-resistant aluminum alloy profiles exhibit insufficient corrosion resistance, making them susceptible to corrosion and oxidation, thus affecting the material's service life. Summary of the Invention

[0004] In view of this, in order to solve one of the above problems, the present invention provides a corrosion-resistant aluminum alloy profile and its preparation method, the specific technical solution of which is as follows:

[0005] A corrosion-resistant aluminum alloy profile, the corrosion-resistant aluminum alloy profile comprising a corrosion-resistant aluminum alloy substrate and a corrosion-resistant coating applied to the surface of the corrosion-resistant aluminum alloy substrate;

[0006] The corrosion-resistant aluminum alloy substrate comprises the following components by mass percentage: Zn: 8%–9%, ​​Cu: 0.03%–0.1%, Mg: 0.5%–1.7%, Mn: 0.3%–0.8%, Si: 0.12%–0.18%, Ti: 0.05%–0.09%, Cr: 0.03%–0.05%, with the balance being Al;

[0007] The corrosion-resistant coating comprises the following materials in parts by weight: 7 to 9 parts nickel powder, 5 to 7 parts boron nitride, 1 to 3 parts lanthanum oxide, 1 to 3 parts cerium dioxide, and 3 to 5 parts carboxymethyl cellulose.

[0008] In addition, the present invention also provides a method for preparing a corrosion-resistant aluminum alloy profile, the method comprising the following steps:

[0009] The corrosion-resistant aluminum alloy substrate was prepared according to the percentage composition of the preparation of the corrosion-resistant aluminum alloy substrate;

[0010] Nickel powder, boron nitride, lanthanum oxide, cerium dioxide, and carboxymethyl cellulose are mixed evenly according to the weight ratio to obtain a mixture; then, an ethanol solution accounting for 30% to 35% of the mass of the mixture is added, and after ball milling and drying, ball milled powder is obtained; then, the ball milled powder is calcined and cooled to obtain a corrosion-resistant coating material.

[0011] After surface treatment of the corrosion-resistant aluminum alloy substrate, the corrosion-resistant coating material is laser cladding treated under the protection of inert gas to form a corrosion-resistant coating.

[0012] Furthermore, the method for preparing the corrosion-resistant aluminum alloy substrate includes the following steps:

[0013] Aluminum ingots are placed in a melting furnace and heated to 720℃~760℃, held for 30min~45min to obtain molten aluminum. Then, Al-Cu master alloy, Al-Mn master alloy, Al-Si master alloy, Al-Ti-B master alloy, and Al-Cr master alloy are added and stirred evenly. The temperature is raised to 765℃~800℃ and held for 1h~2h. The temperature is then lowered to 720℃~740℃, and zinc ingots and magnesium ingots are added. The mixture is stirred for 10min~20min to obtain alloy liquid. A refining agent is then added to refine the liquid, degassing and removing slag to obtain a refined liquid. The refined liquid is then cast to obtain aluminum alloy ingots.

[0014] The aluminum alloy ingot is extruded to obtain aluminum alloy profiles;

[0015] The aluminum alloy profile is subjected to heat treatment, quenching treatment and aging treatment to obtain a corrosion-resistant aluminum alloy substrate.

[0016] Furthermore, the extrusion process includes primary extrusion, secondary extrusion, and tertiary extrusion. The primary extrusion temperature is 450℃~460℃, the extrusion speed is 10m / min~15m / min, and the extrusion ratio is 30~40. The secondary extrusion temperature is 420℃~430℃, the extrusion speed is 5m / min~8m / min, and the extrusion ratio is 20~30. The tertiary extrusion temperature is 400℃~420℃, the extrusion speed is 1m / min~4m / min, and the extrusion ratio is 10~20.

[0017] Furthermore, the heat treatment temperature is 460℃~470℃, and the time is 8h~10h.

[0018] Furthermore, the aging treatment temperature is 120℃~135℃, and the holding time is 15h~20h.

[0019] Furthermore, the calcination treatment is carried out at a temperature of 1000℃ to 1200℃ for a time of 10 min to 20 min.

[0020] Furthermore, the inert gas is argon or nitrogen.

[0021] Furthermore, in the laser cladding process, the thickness of the corrosion-resistant coating material is 1.5 mm to 2.0 mm.

[0022] Furthermore, in the laser cladding process, the output power is 2000W to 2200W, the scanning speed is 8mm / s to 12mm / s, and the spot diameter is 4mm to 5mm.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. This invention optimizes the composition of corrosion-resistant aluminum alloys, which helps to control the internal structure of aluminum alloy profiles, obtaining a layered heterogeneous structure. In the aluminum alloy substrate, Mn / Cr forms a corrosion-resistant dispersed phase, Mn forms a corrosion-resistant Al6(Mn,Fe) phase, Cr inhibits grain boundary corrosion, and Ti refines grains to reduce galvanic corrosion. Overall, this not only ensures the strength of the aluminum alloy profile but also synergistically improves its corrosion resistance. Furthermore, the three-stage extrusion process effectively achieves dynamic recrystallization, refined grain orientation, reduces internal stress, and progressively lowers the stress level to avoid banded structures, thus ensuring the mechanical properties of the aluminum alloy substrate.

[0025] 2. This invention forms a corrosion-resistant coating on the surface of a corrosion-resistant aluminum alloy substrate through laser cladding. While ensuring the application performance of the aluminum alloy profile, it can also significantly improve the corrosion resistance of the aluminum alloy profile. After the raw materials for preparing the corrosion-resistant coating are compounded, nickel powder can enhance the resistance to pitting corrosion and intergranular corrosion, and synergistically increase the toughness of the coating with boron nitride, promoting the adhesion between the coating and the substrate; boron nitride can improve the acid resistance and wear resistance of the aluminum alloy profile surface and block corrosion channels; lanthanum oxide and cerium dioxide work synergistically to refine the surface grains, reduce the porosity generated during the cladding process, improve the density of the coating, and also promote compatibility with the aluminum alloy substrate, reduce the tendency of cladding cracks, and ensure the appearance quality of the aluminum alloy profile. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of the invention.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] The implementation schemes of the present invention will now be described in detail with reference to specific embodiments.

[0029] Example 1:

[0030] A corrosion-resistant aluminum alloy profile, comprising a corrosion-resistant aluminum alloy substrate and a corrosion-resistant coating applied to the surface of the corrosion-resistant aluminum alloy substrate; the corrosion-resistant aluminum alloy substrate comprises the following components by mass percentage: Zn: 9%, Cu: 0.05%, Mg: 1.2%, Mn: 0.5%, Si: 0.15%, Ti: 0.06%, Cr: 0.03%, with the balance being Al;

[0031] A method for preparing a corrosion-resistant aluminum alloy profile, the method comprising the following steps:

[0032] Aluminum ingots are placed in a melting furnace and heated to 760°C, held for 30 minutes to obtain molten aluminum. Then, Al-Cu master alloy, Al-Mn master alloy, Al-Si master alloy, Al-Ti-B master alloy, and Al-Cr master alloy are added and stirred evenly. The temperature is raised to 780°C and held for 2 hours. The temperature is then lowered to 720°C, and zinc and magnesium ingots are added. The mixture is stirred for 15 minutes to obtain alloy liquid. Refining agents are then added to refine the liquid, degassing and removing slag to obtain a refined liquid. Finally, aluminum alloy ingots are cast.

[0033] The aluminum alloy ingot is subjected to extrusion processing, which includes primary extrusion, secondary extrusion, and tertiary extrusion. The primary extrusion temperature is 450℃, the extrusion speed is 15m / min, and the extrusion ratio is 30. The secondary extrusion temperature is 420℃, the extrusion speed is 8m / min, and the extrusion ratio is 20. The tertiary extrusion temperature is 400℃, the extrusion speed is 3m / min, and the extrusion ratio is 10, to obtain an aluminum alloy profile.

[0034] The aluminum alloy profile was heat-treated at 460℃ for 10 hours, then quenched, and then held at 120℃ for 20 hours to obtain a corrosion-resistant aluminum alloy substrate.

[0035] By weight ratio, 8 parts nickel powder, 7 parts boron nitride, 2 parts lanthanum oxide, 1 part cerium dioxide and 4 parts carboxymethyl cellulose are mixed evenly to obtain a mixture; then, 35% of the mass of the mixture is added to an ethanol solution, and after ball milling and drying, ball milled powder is obtained; then, the ball milled powder is calcined at 1000℃ for 12 minutes, and after cooling, a corrosion-resistant coating material is obtained.

[0036] After surface treatment of the corrosion-resistant aluminum alloy substrate, a corrosion-resistant coating material with a thickness of 2.0 mm is applied under the protection of argon gas through laser cladding. The laser cladding process has an output power of 2000W, a scanning speed of 10mm / s, and a spot diameter of 5mm, thereby forming a corrosion-resistant coating.

[0037] Example 2:

[0038] A corrosion-resistant aluminum alloy profile, comprising a corrosion-resistant aluminum alloy substrate and a corrosion-resistant coating applied to the surface of the corrosion-resistant aluminum alloy substrate; the corrosion-resistant aluminum alloy substrate comprises the following components by mass percentage: Zn: 9%, Cu: 0.06%, Mg: 1.3%, Mn: 0.6%, Si: 0.13%, Ti: 0.06%, Cr: 0.04%, with the balance being Al;

[0039] A method for preparing a corrosion-resistant aluminum alloy profile, the method comprising the following steps:

[0040] Aluminum ingots are placed in a melting furnace and heated to 755°C, held for 40 minutes to obtain molten aluminum. Then, Al-Cu master alloy, Al-Mn master alloy, Al-Si master alloy, Al-Ti-B master alloy, and Al-Cr master alloy are added and stirred evenly. The temperature is raised to 780°C and held for 2 hours. The temperature is then lowered to 720°C, and zinc and magnesium ingots are added and stirred for 15 minutes to obtain alloy liquid. Refining agents are then added to refine the liquid, degassing and removing slag to obtain a refined liquid. Finally, aluminum alloy ingots are cast.

[0041] The aluminum alloy ingot is subjected to extrusion processing, which includes primary extrusion, secondary extrusion, and tertiary extrusion. The primary extrusion temperature is 460℃, the extrusion speed is 15m / min, and the extrusion ratio is 35. The secondary extrusion temperature is 420℃, the extrusion speed is 8m / min, and the extrusion ratio is 20. The tertiary extrusion temperature is 400℃, the extrusion speed is 4m / min, and the extrusion ratio is 15, to obtain aluminum alloy profiles.

[0042] The aluminum alloy profile was heat-treated at 465℃ for 9 hours, then quenched, and then held at 120℃ for 20 hours to obtain a corrosion-resistant aluminum alloy substrate.

[0043] According to the weight ratio, 8 parts of nickel powder, 5 parts of boron nitride, 3 parts of lanthanum oxide, 1 part of cerium dioxide and 5 parts of carboxymethyl cellulose are mixed evenly to obtain a mixture; then, 35% of the mass of the mixture is added to an ethanol solution, and after ball milling and drying, ball milled powder is obtained; then, the ball milled powder is calcined at 1100℃ for 10 minutes, and after cooling, a corrosion-resistant coating material is obtained.

[0044] After surface treatment of the corrosion-resistant aluminum alloy substrate, a corrosion-resistant coating material with a thickness of 2.0 mm is applied under the protection of argon gas through laser cladding. The laser cladding process has an output power of 2200W, a scanning speed of 12mm / s, and a spot diameter of 5mm, thereby forming a corrosion-resistant coating.

[0045] Example 3:

[0046] A corrosion-resistant aluminum alloy profile, comprising a corrosion-resistant aluminum alloy substrate and a corrosion-resistant coating applied to the surface of the corrosion-resistant aluminum alloy substrate; the corrosion-resistant aluminum alloy substrate comprises the following components by mass percentage: Zn: 8.5%, Cu: 0.07%, Mg: 1.4%, Mn: 0.7%, Si: 0.18%, Ti: 0.05%, Cr: 0.03%, with the balance being Al;

[0047] A method for preparing a corrosion-resistant aluminum alloy profile, the method comprising the following steps:

[0048] Aluminum ingots are placed in a melting furnace and heated to 760°C, held for 45 minutes to obtain molten aluminum. Then, Al-Cu master alloy, Al-Mn master alloy, Al-Si master alloy, Al-Ti-B master alloy, and Al-Cr master alloy are added and stirred evenly. The temperature is raised to 780°C and held for 2 hours. The temperature is then lowered to 720°C, and zinc and magnesium ingots are added and stirred for 15 minutes to obtain alloy liquid. Refining agents are then added to refine the liquid, degassing and removing slag to obtain a refined liquid. The refined liquid is then cast to obtain aluminum alloy ingots.

[0049] The aluminum alloy ingot is subjected to extrusion processing, which includes primary extrusion, secondary extrusion, and tertiary extrusion. The primary extrusion temperature is 450°C, the extrusion speed is 12 m / min, and the extrusion ratio is 30. The secondary extrusion temperature is 420°C, the extrusion speed is 7 m / min, and the extrusion ratio is 20. The tertiary extrusion temperature is 400°C, the extrusion speed is 3 m / min, and the extrusion ratio is 10, to obtain aluminum alloy profiles.

[0050] The aluminum alloy profile was heat-treated at 460℃ for 10 hours, then quenched, and then held at 125℃ for 18 hours to obtain a corrosion-resistant aluminum alloy substrate.

[0051] According to the weight ratio, 7 parts nickel powder, 5 parts boron nitride, 3 parts lanthanum oxide, 3 parts cerium dioxide and 5 parts carboxymethyl cellulose are mixed evenly to obtain a mixture; then an ethanol solution accounting for 35% of the mass of the mixture is added, and after ball milling and drying, ball milled powder is obtained; then the ball milled powder is calcined at 1000℃ for 20 minutes, and after cooling, a corrosion-resistant coating material is obtained.

[0052] After surface treatment of the corrosion-resistant aluminum alloy substrate, a corrosion-resistant coating material with a thickness of 2.0 mm is applied under the protection of argon gas through laser cladding. During the laser cladding process, the output power is 2200W, the scanning speed is 10mm / s, and the spot diameter is 5mm, thereby forming a corrosion-resistant coating.

[0053] Comparative Example 1:

[0054] Compared with Example 3, Comparative Example 1 did not have Mn added to the chemical composition of the aluminum alloy substrate, but was otherwise the same as Example 3.

[0055] Comparative Example 2:

[0056] Compared with Example 3, Comparative Example 2 did not have Cr added to the chemical composition of the aluminum alloy substrate, but was otherwise the same as Example 3.

[0057] Comparative Example 3:

[0058] Compared with Example 3, the materials used to prepare the corrosion-resistant coating in Comparative Example 3 did not contain nickel powder, but were otherwise the same as in Example 3.

[0059] Example 4:

[0060] Compared with Example 3, the materials used to prepare the corrosion-resistant coating in Comparative Example 4 did not contain boron nitride, but were otherwise the same as in Example 3.

[0061] Comparative Example 5:

[0062] Compared with Example 3, the corrosion-resistant coating of Comparative Example 5 was prepared without the addition of lanthanum oxide, but otherwise it was the same as that of Example 3.

[0063] Comparative Example 6:

[0064] Compared with Example 3, the corrosion-resistant coating of Comparative Example 6 was prepared without the addition of cerium dioxide, but otherwise it was the same as that of Example 3.

[0065] The corrosion-resistant aluminum alloy profiles prepared in Examples 1-3 and the comparative corrosion-resistant aluminum alloy profiles prepared in Comparative Examples 1-6 were subjected to performance tests, and the results are shown in Table 1 below.

[0066] Adhesion test: The grid method is used, and the specific test method is referenced in ISO24092020.

[0067] Mechanical properties of aluminum alloy extruded profiles were tested according to GB / T228-2010 "Metallic materials - Tensile testing - Part 1: Test method at room temperature"; exfoliation corrosion performance was tested according to GB / T22639-2022. The results are shown in Table 1 below.

[0068] Table 1: Performance Test Results

[0069]

[0070]

[0071] Among them, EA: no visible corrosion; EB: localized peeling; EC: large-area peeling; ED: coating failure + substrate corrosion.

[0072] Analysis of the data in Table 1 shows that this invention optimizes the composition of the aluminum alloy substrate, further improving its corrosion resistance while ensuring its mechanical properties. Comparative Example 1, lacking Mn, exhibits a significant decrease in mechanical properties. Comparative Example 2, lacking Cr, weakens the grain boundary purification effect of Cr, leading to a decrease in local deformation capacity. This indicates that the dispersed phase formed by adding Mn in this invention hinders crack propagation, and the Cr segregation at grain boundaries inhibits intergranular crack propagation. This synergistic effect further enhances the corrosion resistance of the aluminum alloy substrate. Furthermore, regarding the corrosion-resistant coating, this invention optimizes the composition ratio of the corrosion-resistant coating, synergistically improving the surface corrosion resistance of the aluminum alloy profile. Analysis of the data in Comparative Examples 3-6 in Table 1 shows that nickel powder helps improve the surface bonding between the corrosion-resistant coating and the corrosion-resistant aluminum alloy substrate. The lack of nickel powder reduces the coating adhesion and results in poor corrosion resistance. Comparative Example 4, lacking boron nitride, suffers from a lack of layered structure, allowing corrosive media to easily penetrate to the interface, affecting corrosion resistance. Comparative Example 5, lacking lanthanum oxide, results in coarsened coating grains, weakened corrosion protection, and edge peeling. Comparative Example 6 lacked cerium dioxide, resulting in weakened coating protection and increased susceptibility to pitting corrosion. In summary, this invention, by forming a corrosion-resistant coating on the surface of a corrosion-resistant aluminum alloy substrate through laser cladding, significantly improves the corrosion resistance of the aluminum alloy profile while ensuring its application performance.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A corrosion-resistant aluminum alloy profile, characterized in that, The corrosion-resistant aluminum alloy profile includes a corrosion-resistant aluminum alloy substrate and a corrosion-resistant coating applied to the surface of the corrosion-resistant aluminum alloy substrate; The corrosion-resistant aluminum alloy substrate comprises the following components by mass percentage: Zn: 8%~9%, Cu: 0.03%~0.1%, Mg: 0.5%~1.7%, Mn: 0.3%~0.8%, Si: 0.12%~0.18%, Ti: 0.05%~0.09%, Cr: 0.03%~0.05%, with the balance being Al; The corrosion-resistant coating comprises the following materials in parts by weight: 7 to 9 parts nickel powder, 5 to 7 parts boron nitride, 1 to 3 parts lanthanum oxide, 1 to 3 parts cerium dioxide, and 3 to 5 parts carboxymethyl cellulose; The method for preparing the corrosion-resistant aluminum alloy profile includes the following steps: The corrosion-resistant aluminum alloy substrate was prepared according to the percentage composition of the preparation of the corrosion-resistant aluminum alloy substrate; Nickel powder, boron nitride, lanthanum oxide, cerium dioxide, and carboxymethyl cellulose are mixed evenly according to the weight ratio to obtain a mixture; then, 30% to 35% of the mass of the mixture is added to an ethanol solution, and after ball milling and drying, ball milled powder is obtained; then, the ball milled powder is calcined and cooled to obtain a corrosion-resistant coating material. After surface treatment of the corrosion-resistant aluminum alloy substrate, the corrosion-resistant coating material with a thickness of 1.5mm to 2.0mm is laser cladding under the protection of inert gas. In the laser cladding process, the output power is 2000W to 2200W, the scanning speed is 8mm / s to 12mm / s, and the spot diameter is 4mm to 5mm, thereby forming a corrosion-resistant coating.

2. A method for preparing a corrosion-resistant aluminum alloy profile, characterized in that, The preparation method is used to prepare the corrosion-resistant aluminum alloy profile as described in claim 1, and the preparation method includes the following steps: The corrosion-resistant aluminum alloy substrate was prepared according to the percentage composition of the preparation of the corrosion-resistant aluminum alloy substrate; Nickel powder, boron nitride, lanthanum oxide, cerium dioxide, and carboxymethyl cellulose are mixed evenly according to the weight ratio to obtain a mixture; then, 30% to 35% of the mass of the mixture is added to an ethanol solution, and after ball milling and drying, ball milled powder is obtained; then, the ball milled powder is calcined and cooled to obtain a corrosion-resistant coating material. After surface treatment of the corrosion-resistant aluminum alloy substrate, the corrosion-resistant coating material is laser cladding treated under the protection of inert gas to form a corrosion-resistant coating.

3. The preparation method according to claim 2, characterized in that, The method for preparing the corrosion-resistant aluminum alloy substrate includes the following steps: Aluminum ingots are placed in a melting furnace and heated to 720℃~760℃, held for 30min~45min to obtain molten aluminum. Then, Al-Cu master alloy, Al-Mn master alloy, Al-Si master alloy, Al-Ti-B master alloy, and Al-Cr master alloy are added and stirred evenly. The temperature is raised to 765℃~800℃ and held for 1h~2h. The temperature is then lowered to 720℃~740℃, and zinc ingots and magnesium ingots are added. The mixture is stirred for 10min~20min to obtain alloy liquid. A refining agent is then added to refine the liquid, degassing and removing slag to obtain a refined liquid. The refined liquid is then cast to obtain aluminum alloy ingots. The aluminum alloy ingot is extruded to obtain aluminum alloy profiles; The aluminum alloy profile is subjected to heat treatment, quenching treatment and aging treatment to obtain a corrosion-resistant aluminum alloy substrate.

4. The preparation method according to claim 3, characterized in that, The extrusion process includes primary extrusion, secondary extrusion, and tertiary extrusion. The primary extrusion temperature is 450℃~460℃, the extrusion speed is 10m / min~15m / min, and the extrusion ratio is 30~40. The secondary extrusion temperature is 420℃~430℃, the extrusion speed is 5m / min~8m / min, and the extrusion ratio is 20~30. The tertiary extrusion temperature is 400℃~420℃, the extrusion speed is 1m / min~4m / min, and the extrusion ratio is 10~20.

5. The preparation method according to claim 3, characterized in that, The heat treatment temperature is 460℃~470℃, and the time is 8h~10h.

6. The preparation method according to claim 3, characterized in that, The aging treatment temperature is 120℃~135℃, and the holding time is 15h~20h.

7. The preparation method according to claim 2, characterized in that, The calcination treatment is carried out at a temperature of 1000℃~1200℃ for a time of 10min~20min.

8. The preparation method according to claim 2, characterized in that, The inert gas is argon or nitrogen.

9. The preparation method according to claim 2, characterized in that, In the laser cladding process, the thickness of the corrosion-resistant coating material is 1.5mm to 2.0mm.

10. The preparation method according to claim 2, characterized in that, In the laser cladding process, the output power is 2000W~2200W, the scanning speed is 8mm / s~12mm / s, and the spot diameter is 4mm~5mm.

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