Corrosion-resistant aluminum alloy profile and preparation method thereof

Abstract

The invention discloses a corrosion-resistant aluminum alloy profile and a preparation method thereof, and belongs to the technical field of aluminum alloy profiles. By optimizing the components of the corrosion-resistant aluminum alloy, the strength of the aluminum alloy profile can be guaranteed, and the corrosion resistance of the aluminum alloy profile is positively influenced. Besides, the corrosion-resistant coating is formed on the surface of the corrosion-resistant aluminum alloy base material in a laser cladding mode, the corrosion resistance of the aluminum alloy profile can be remarkably improved while the application performance of the aluminum alloy profile is guaranteed, and in the corrosion-resistant coating, nickel powder can enhance pitting corrosion resistance and intergranular corrosion resistance, so that the corrosion resistance of the aluminum alloy profile is improved. The adhesive force with an aluminum alloy base material is improved; the boron nitride can improve the acid resistance and wear resistance of the surface of the aluminum alloy profile and block a corrosion channel; the lanthanum oxide and the cerium dioxide have a synergistic effect, so that surface grains can be refined, air holes generated in the cladding process are reduced, the compactness of the coating is improved, the compatibility with an aluminum alloy base material is promoted, and the apparent quality of the aluminum alloy profile is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of aluminum alloy preparation, and in particular to a corrosion-resistant aluminum alloy profile and a preparation method thereof. Background Art

[0002] Aluminum alloy profiles offer advantages such as low specific gravity, high strength, superior machinability, high specific strength, and good corrosion resistance. They are widely used in aerospace and other defense industries and are currently one of the primary structural materials in the aerospace industry. As the demand for long life and low cost in aerospace continues to increase, the demand for structural materials is also increasing. Ultra-high-strength aluminum alloys with excellent comprehensive properties and high specific strength have gained widespread application. Traditional preparation processes include extrusion, rolling, and heat treatment to produce aluminum alloys with excellent corrosion resistance.

[0003] Existing technologies have also shown that increasing the content of Zn, Mg, and Cu alloying elements to enhance precipitation strengthening can significantly increase alloy strength. However, this increased strength can also lead to reduced plasticity, toughness, and corrosion resistance. This results in traditional corrosion-resistant aluminum alloy profiles exhibiting insufficient corrosion resistance in complex environments, making them susceptible to potential risks of corrosion and oxidation, which in turn affects the material's service life. Summary of the Invention

[0004] Based on this, in order to solve one of the above problems, the present invention provides a corrosion-resistant aluminum alloy profile and a preparation method thereof. The specific technical solution is as follows:

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

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

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

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

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

[0010] Nickel powder, boron nitride, lanthanum oxide, cerium dioxide, and carboxymethyl cellulose are uniformly mixed in parts by weight to obtain a mixture; an ethanol solution accounting for 30% to 35% by weight of the mixture is then added, and the mixture is ball-milled and dried to obtain a ball-milled powder; the ball-milled powder is then calcined and cooled to obtain a corrosion-resistant coating material;

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

[0012] Furthermore, the preparation method of the corrosion-resistant aluminum alloy substrate comprises the following steps:

[0013] The aluminum ingot is placed in a melting furnace, heated to 720-760°C, and kept warm for 30-45 minutes to obtain aluminum liquid; 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, stirred evenly, heated to 765-800°C, kept warm for 1-2 hours, cooled to 720-740°C, and zinc ingot and magnesium ingot are added, stirred for 10-20 minutes to obtain alloy liquid; then, a refining agent is added for refining, degassing and deslagging to obtain refined liquid; and then, an aluminum alloy ingot is cast.

[0014] Extruding the aluminum alloy ingot to obtain an aluminum alloy profile;

[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 third-stage extrusion, and the temperature of the primary extrusion is 450°C to 460°C, the extrusion speed is 10m / min to 15m / min, and the extrusion ratio is 30 to 40; the temperature of the secondary extrusion is 420°C to 430°C, the extrusion speed is 5m / min to 8m / min, and the extrusion ratio is 20 to 30; the temperature of the third-stage extrusion is 400°C to 420°C, the extrusion speed is 1m / min to 4m / min, and the extrusion ratio is 10 to 20.

[0017] Furthermore, the heat treatment temperature is 460° C. to 470° C., and the time is 8 h to 10 h.

[0018] Furthermore, the temperature of the aging treatment is 120° C. to 135° C., and the holding time is 15 h to 20 h.

[0019] Furthermore, the calcination treatment is performed at a temperature of 1000° C. to 1200° C. and 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. The present invention optimizes the composition of the corrosion-resistant aluminum alloy, helping to regulate the internal structure of the aluminum alloy profile, obtaining a layered heterogeneous structure. The Mn / Cr in the aluminum alloy substrate forms a corrosion-resistant dispersed phase, Mn forms a corrosion-resistant Al6(Mn,Fe) phase, Cr inhibits intergranular corrosion, and Ti refines the grains to reduce galvanic corrosion. Overall, this not only ensures the strength of the aluminum alloy profile but also synergistically improves its corrosion resistance. In addition, through a three-stage extrusion process, dynamic recrystallization can be effectively achieved, refining grain orientation, reducing internal stress, and gradually reducing banded structure to ensure the mechanical properties of the aluminum alloy substrate.

[0025] 2. The present invention forms a corrosion-resistant coating on the surface of a 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. 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 cooperate with boron nitride to increase the toughness of the coating and promote the adhesion between the coating and the substrate; boron nitride can improve the acid resistance and wear resistance of the surface of the aluminum alloy profile and block corrosion channels; lanthanum oxide and cerium dioxide work synergistically to refine the surface grains, reduce the pores generated during the cladding process, improve the density of the coating, and promote compatibility with the aluminum alloy substrate, reduce the tendency of cladding cracks, and ensure the apparent quality of the aluminum alloy profile. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with its embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] The embodiments of the present invention will be described in detail below with reference to specific examples.

[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 in mass percentage: Zn: 9%, Cu: 0.05%, Mg: 1.2%, Mn: 0.5%, Si: 0.15%, Ti: 0.06%, Cr: 0.03%, and the balance being Al;

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

[0032] The aluminum ingot is placed in a melting furnace, heated to 760°C, and kept warm for 30 minutes to obtain aluminum liquid; 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, stirred evenly, heated to 780°C, kept warm for 2 hours, cooled to 720°C, and zinc ingot and magnesium ingot are added, stirred for 15 minutes to obtain alloy liquid; then, a refining agent is added for refining, degassing and deslagging to obtain refined liquid; and then, an aluminum alloy ingot is cast.

[0033] The aluminum alloy ingot is subjected to an extrusion process, and the extrusion process includes a first-stage extrusion, a second-stage extrusion, and a third-stage extrusion, wherein the first-stage extrusion temperature is 450° C., the extrusion speed is 15 m / min, and the extrusion ratio is 30; the second-stage extrusion temperature is 420° C., the extrusion speed is 8 m / min, and the extrusion ratio is 20; and the third-stage extrusion temperature is 400° C., the extrusion speed is 3 m / min, and the extrusion ratio is 10, to obtain an aluminum alloy profile;

[0034] The aluminum alloy profile is heat-treated at 460° C. for 10 hours, followed by quenching, and then kept at 120° C. for 20 hours to obtain a corrosion-resistant aluminum alloy substrate;

[0035] 8 parts of nickel powder, 7 parts of boron nitride, 2 parts of lanthanum oxide, 1 part of cerium dioxide, and 4 parts of carboxymethyl cellulose are uniformly mixed by weight to obtain a mixture; an ethanol solution accounting for 35% by weight of the mixture is then added, and the mixture is ball-milled and dried to obtain a ball-milled powder; the ball-milled powder is then calcined at 1000° C. for 12 minutes, and cooled to obtain a corrosion-resistant coating material;

[0036] After the corrosion-resistant aluminum alloy substrate is surface-treated, a corrosion-resistant coating material with a thickness of 2.0 mm is processed by laser cladding under the protection of argon gas. During the laser cladding process, the output power is 2000 W, the scanning speed is 10 mm / s, and the spot diameter is 5 mm, so as to form 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 in mass percentage: Zn: 9%, Cu: 0.06%, Mg: 1.3%, Mn: 0.6%, Si: 0.13%, Ti: 0.06%, Cr: 0.04%, and the balance being Al;

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

[0040] The aluminum ingot is placed in a melting furnace, heated to 755°C, and kept warm for 40 minutes to obtain aluminum liquid; 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, stirred evenly, heated to 780°C, kept warm for 2 hours, cooled to 720°C, and zinc ingot and magnesium ingot are added, stirred for 15 minutes to obtain alloy liquid; then, a refining agent is added for refining, degassing and deslagging to obtain refined liquid; and then, an aluminum alloy ingot is cast.

[0041] The aluminum alloy ingot is subjected to an extrusion process, and the extrusion process includes a first-stage extrusion, a second-stage extrusion, and a third-stage extrusion, wherein the first-stage extrusion temperature is 460° C., the extrusion speed is 15 m / min, and the extrusion ratio is 35; the second-stage extrusion temperature is 420° C., the extrusion speed is 8 m / min, and the extrusion ratio is 20; and the third-stage extrusion temperature is 400° C., the extrusion speed is 4 m / min, and the extrusion ratio is 15, to obtain an aluminum alloy profile;

[0042] The aluminum alloy profile is heat-treated at 465° C. for 9 hours, then quenched, and then kept at 120° C. for 20 hours to obtain a corrosion-resistant aluminum alloy substrate;

[0043] 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 uniformly mixed by weight to obtain a mixture; an ethanol solution accounting for 35% by weight of the mixture is then added, and the mixture is ball-milled and dried to obtain a ball-milled powder; the ball-milled powder is then calcined at 1100° C. for 10 minutes, and cooled to obtain a corrosion-resistant coating material;

[0044] After the corrosion-resistant aluminum alloy substrate is surface-treated, a corrosion-resistant coating material with a thickness of 2.0 mm is processed by laser cladding under the protection of argon gas. During the laser cladding process, the output power is 2200 W, the scanning speed is 12 mm / s, and the spot diameter is 5 mm, so as to form 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 in mass percentage: Zn: 8.5%, Cu: 0.07%, Mg: 1.4%, Mn: 0.7%, Si: 0.18%, Ti: 0.05%, Cr: 0.03%, and the balance being Al;

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

[0048] The aluminum ingot is placed in a melting furnace, heated to 760°C, and kept warm for 45 minutes to obtain aluminum liquid; 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, stirred evenly, heated to 780°C, kept warm for 2 hours, cooled to 720°C, and zinc ingot and magnesium ingot are added, stirred for 15 minutes to obtain alloy liquid; then, a refining agent is added for refining, degassing and deslagging to obtain refined liquid; and then, an aluminum alloy ingot is cast.

[0049] The aluminum alloy ingot is subjected to an extrusion process, and the extrusion process includes a primary extrusion process, a secondary extrusion process, and a third extrusion process, wherein the primary extrusion process is performed at a temperature of 450° C., an extrusion speed of 12 m / min, and an extrusion ratio of 30; the secondary extrusion process is performed at a temperature of 420° C., an extrusion speed of 7 m / min, and an extrusion ratio of 20; and the third extrusion process is performed at a temperature of 400° C., an extrusion speed of 3 m / min, and an extrusion ratio of 10, to obtain an aluminum alloy profile;

[0050] The aluminum alloy profile is heat-treated at 460° C. for 10 hours, followed by quenching, and then kept at 125° C. for 18 hours to obtain a corrosion-resistant aluminum alloy substrate;

[0051] 7 parts of nickel powder, 5 parts of boron nitride, 3 parts of lanthanum oxide, 3 parts of cerium dioxide, and 5 parts of carboxymethyl cellulose are uniformly mixed by weight to obtain a mixture; an ethanol solution accounting for 35% by weight of the mixture is then added, and the mixture is ball-milled and dried to obtain a ball-milled powder; the ball-milled powder is then calcined at 1000° C. for 20 minutes and cooled to obtain a corrosion-resistant coating material;

[0052] After the corrosion-resistant aluminum alloy substrate is surface-treated, a corrosion-resistant coating material with a thickness of 2.0 mm is processed by laser cladding under the protection of argon gas. During the laser cladding process, the output power is 2200 W, the scanning speed is 10 mm / s, and the spot diameter is 5 mm, so as to form a corrosion-resistant coating.

[0053] Comparative Example 1:

[0054] Compared with Example 3, Comparative Example 1 does not add Mn element to the chemical composition of the aluminum alloy substrate in Comparative Example 1, and the other chemical components are the same as those in Example 3.

[0055] Comparative Example 2:

[0056] Compared with Example 3, Comparative Example 2 does not add Cr element to the chemical composition of the aluminum alloy substrate in Comparative Example 2, and the other chemical compositions are the same as those in Example 3.

[0057] Comparative Example 3:

[0058] Comparative Example 3 Compared with Example 3, the preparation material of the corrosion-resistant coating in Comparative Example 3 does not add nickel powder, and the rest is the same as Example 3.

[0059] Example 4:

[0060] Comparative Example 4 Compared with Example 3, the preparation material of the corrosion-resistant coating of Comparative Example 4 does not add boron nitride, and the rest is the same as Example 3.

[0061] Comparative Example 5:

[0062] Comparative Example 5 Compared with Example 3, the preparation material of the corrosion-resistant coating of Comparative Example 5 does not add lanthanum oxide, and the rest is the same as Example 3.

[0063] Comparative Example 6:

[0064] Comparative Example 6 Compared with Example 3, the preparation material of the corrosion-resistant coating of Comparative Example 6 does not add cerium dioxide, and the rest is the same as Example 3.

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

[0066] Among them, adhesion test: adopt the grid method, the specific test method refers to ISO24092020;

[0067] The mechanical properties of aluminum alloy extruded profiles were tested with reference to GB / T228-2010 "Tension Tests on Metallic Materials Part 1: Room Temperature Test Methods"; the exfoliation corrosion performance test was carried out with reference 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: local peeling; EC: large-area peeling; ED: coating failure + substrate corrosion.

[0072] From the data analysis in Table 1, it can be seen that the present invention optimizes the composition of the aluminum alloy substrate, further improving its corrosion resistance while ensuring the mechanical properties of the aluminum alloy substrate. In Comparative Example 1, the mechanical properties are significantly reduced due to the lack of Mn element. In Comparative Example 2, the grain boundary purification effect of Cr is weakened, resulting in a decrease in local deformation capacity. This shows that the dispersed phase formed by the addition of Mn element in the present invention hinders crack propagation, and the segregation of Cr at the grain boundaries inhibits crack propagation along the crystal. The synergistic effect further helps to improve the corrosion resistance of the aluminum alloy substrate. In addition, with respect to the corrosion-resistant coating, the present invention optimizes the composition ratio of the corrosion-resistant coating to synergistically optimize the surface corrosion resistance of the aluminum alloy profile. From the data analysis of Comparative Examples 3 to 6 in Table 1, it can be seen that nickel powder helps to improve the surface bonding of the corrosion-resistant coating and the corrosion-resistant aluminum alloy substrate. In the absence of nickel powder, the adhesion of the coating decreases, and at the same time, the corrosion resistance is poor. In Comparative Example 4, boron nitride is missing. The lack of boron nitride's layered structure makes it easy for corrosive media to penetrate into the interface, affecting the corrosion resistance. In Comparative Example 5, lanthanum oxide is missing, and the coating grains are coarsened, the corrosion protection is weakened, and edge peeling occurs. Comparative Example 6 lacks ceria, and the coating's protective power is weakened, easily inducing pitting corrosion. In summary, the present invention forms a corrosion-resistant coating on the surface of a corrosion-resistant aluminum alloy substrate by laser cladding, thereby significantly improving the corrosion resistance of the aluminum alloy profile while maintaining the application performance of the aluminum alloy profile.

[0073] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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 above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A corrosion-resistant aluminum alloy profile, characterized in that: The corrosion-resistant aluminum alloy profile comprises a corrosion-resistant aluminum alloy substrate and a corrosion-resistant coating applied on the surface of the corrosion-resistant aluminum alloy substrate; The corrosion-resistant aluminum alloy substrate comprises the following components in mass percentage: Zn: 8% to 9%, Cu: 0.03% to 0.1%, Mg: 0.5% to 1.7%, Mn: 0.3% to 0.8%, Si: 0.12% to 0.18%, Ti: 0.05% to 0.09%, Cr: 0.03% to 0.05%, and the balance is Al; The corrosion-resistant coating comprises the following materials in parts by weight: 7 to 9 parts of nickel powder, 5 to 7 parts of boron nitride, 1 to 3 parts of lanthanum oxide, 1 to 3 parts of cerium dioxide and 3 to 5 parts of carboxymethyl cellulose.

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 according to claim 1, and the preparation method comprises the following steps: A corrosion-resistant aluminum alloy substrate is prepared according to the preparation percentage composition of the corrosion-resistant aluminum alloy substrate; Nickel powder, boron nitride, lanthanum oxide, cerium dioxide, and carboxymethyl cellulose are uniformly mixed in parts by weight to obtain a mixture; an ethanol solution accounting for 30% to 35% by weight of the mixture is then added, and the mixture is ball-milled and dried to obtain a ball-milled powder; the ball-milled powder is then calcined and cooled to obtain a corrosion-resistant coating material; After the corrosion-resistant aluminum alloy substrate is surface treated, the corrosion-resistant coating material is subjected to laser cladding treatment under the protection of an inert gas to form a corrosion-resistant coating.

3. The preparation method according to claim 2, characterized in that The preparation method of the corrosion-resistant aluminum alloy substrate comprises the following steps: The aluminum ingot is placed in a melting furnace, heated to 720-760°C, and kept warm for 30-45 minutes to obtain aluminum liquid; 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, stirred evenly, heated to 765-800°C, kept warm for 1-2 hours, cooled to 720-740°C, and zinc ingot and magnesium ingot are added, stirred for 10-20 minutes to obtain alloy liquid; then, a refining agent is added for refining, degassing and deslagging to obtain refined liquid; and then, an aluminum alloy ingot is cast. Extruding the aluminum alloy ingot to obtain an aluminum alloy profile; 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 third-stage extrusion, and the temperature of the primary extrusion is 450°C to 460°C, the extrusion speed is 10m / min to 15m / min, and the extrusion ratio is 30 to 40; the temperature of the secondary extrusion is 420°C to 430°C, the extrusion speed is 5m / min to 8m / min, and the extrusion ratio is 20 to 30; the temperature of the third-stage extrusion is 400°C to 420°C, the extrusion speed is 1m / min to 4m / min, and the extrusion ratio is 10 to 20.

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

6. The preparation method according to claim 3, characterized in that The temperature of the aging treatment is 120° C. to 135° C., and the insulation time is 15 hours to 20 hours.

7. The preparation method according to claim 2, characterized in that The calcination treatment is performed at a temperature of 1000° C. to 1200° C. and for a time of 10 to 20 minutes.

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 1.5 mm to 2.0 mm.

10. The preparation method according to claim 2, characterized in that 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.

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