Corrosion-resistant aluminum alloy and method for producing the same

Abstract

This invention relates to the field of aluminum alloy technology and discloses a corrosion-resistant aluminum alloy and its production method. The aluminum alloy is composed of an aluminum alloy matrix, nano-silica sol, and a corrosion-resistant liquid. The aluminum alloy matrix includes the following raw materials: copper, iron, zinc, zirconium, magnesium, gallium, chromium, nickel, cerium, tin, and the balance aluminum. First, nano-silica sol is deposited on the surface of the aluminum alloy. Then, a corrosion-resistant coating liquid is applied to the outside of the sol layer. Under the action of a platinum catalyst, high molecular weight organosilicon long chains are formed through the end alkenyl groups of vinyl ester resin and the silane-hydrogen bonds of hydrogen-containing silicone oil, thereby forming a high-strength organosilicon film. This makes the composite coating have good corrosion resistance and hydrophobicity, which can effectively isolate the surface properties of the aluminum alloy from the influence of humid, alkaline, and salty aqueous solutions, ensuring the long-term corrosion resistance of the aluminum alloy.

Description

Technical Field

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

[0002] Aluminum alloys possess a range of advantages, including low density, high specific strength, good machinability, and strong plasticity, making them widely used in aerospace, shipbuilding, machinery manufacturing, automotive, and chemical industries. Aluminum alloys are relatively reactive; in air, a thin aluminum oxide film naturally forms on their surface, effectively protecting the alloy substrate under normal atmospheric conditions. However, this oxide film is relatively thin and easily damaged or contaminated in humid, alkaline, and saline aqueous solutions, hindering their corrosion resistance. For example, in seawater, pitting and corrosion can occur on the aluminum alloy surface, causing product damage, reducing performance and service life, and even posing safety hazards and incalculable losses. Therefore, to meet the requirements of industrial production, it is necessary to improve the corrosion resistance of aluminum alloys and extend their service life.

[0003] The invention patent with application number CN201810448173.8 discloses a corrosion-resistant aluminum alloy. By adjusting the content of copper, magnesium, zinc, cerium, titanium, chromium, neodymium, terbium, samarium, and boron in the aluminum alloy, the hardness of the aluminum alloy is increased and its corrosion resistance is enhanced. However, the aluminum alloy prepared in this way requires strict control of the raw material ratio, which is not easy to operate and is therefore not conducive to actual production. Coating the surface of the aluminum alloy is relatively easier to operate, but the bonding force between the traditional coating and the aluminum alloy substrate is weak, and the surface corrosion-resistant layer is prone to peeling and wear. The aluminum alloy at the peeling point will corrode in harsh working environments and cannot provide long-term protection. Therefore, how to improve the bonding force between the coating and the aluminum alloy substrate is one of the key issues in using coatings to enhance the corrosion resistance of aluminum alloys. Summary of the Invention

[0004] The purpose of this invention is to provide a corrosion-resistant aluminum alloy and its production method, thereby solving the following technical problems:

[0005] (1) It solves the problem that aluminum alloys are prone to corrosion.

[0006] (2) It solves the problem that the coating is weakly bonded to the aluminum alloy substrate, which makes the coating easy to fall off.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A corrosion-resistant aluminum alloy, the surface of which comprises a sol layer and a corrosion-resistant coating; the aluminum alloy comprises the following raw materials by weight percentage: 0.2-0.4% copper, 0.1-0.25% iron, 3-5% zinc, 0.05-0.1% zirconium, 0.7-0.9% magnesium, 0.08-0.12% gallium, 0.2-0.4% chromium, 1.2-2% nickel, 0.1-0.2% cerium, 2-5% tin, and the balance aluminum; the sol layer is formed by depositing nano-silica sol on the surface of the aluminum alloy; the corrosion-resistant coating is formed by coating a corrosion-resistant coating liquid onto the outside of the sol layer; the film-forming substance of the corrosion-resistant coating liquid is a grafted composite of vinyl ester resin and hydrogen-containing silicone oil.

[0009] A corrosion-resistant aluminum alloy and its production method, comprising the following steps:

[0010] (1) Place aluminum into a melting furnace, raise the temperature of the furnace to 750-780℃, hold for 20-40 minutes to completely melt it, then add copper, iron, zinc, zirconium, magnesium, gallium, chromium, nickel, cerium and tin, and melt at a high temperature of 750-780℃ for 4-6 hours. After complete melting, degas the aluminum alloy solution with argon gas to obtain the solution.

[0011] (2) The temperature of the obtained aluminum alloy solution is measured by hand thermocouple. When the temperature of the solution is 700-720℃, it is taken out of the furnace. The obtained aluminum alloy solution is quickly poured into a preheated mold and allowed to cool naturally to obtain the aluminum alloy matrix.

[0012] (3) At a temperature of 20-40℃, add anhydrous ethanol, deionized water and ammonia to the reactor, then mix and stir evenly for 10-30 minutes to obtain a mixed liquid ①, and put the aluminum alloy matrix obtained in step (2) into the mixed liquid ①.

[0013] (4) Then slowly add tetraethyl orthosilicate to the mixture ① to obtain the mixture ②. Stir the mixture at 70-90℃, let it stand, take it out, blow dry and solidify it to obtain an aluminum alloy containing a sol layer.

[0014] (5) Apply the corrosion-resistant coating liquid evenly to the aluminum alloy surface containing the sol layer, place it in an oven, and cure it at a temperature of 70-90℃ for 1-3 hours to obtain the corrosion-resistant coating attached to the aluminum alloy surface.

[0015] Further, in step (2), the preheated mold is heated to 190-210°C.

[0016] Furthermore, in step (4), the reaction time is 3 to 6 hours; the settling time is 1 to 3 hours.

[0017] Furthermore, in step (4), the curing temperature is 100-130°C and the time is 40-50 min.

[0018] Through the above technical solution, an aluminum alloy substrate is prepared by casting. The aluminum alloy substrate is placed in the hydrolysis solution of tetraethyl orthosilicate. During the hydrolysis of tetraethyl orthosilicate, nano-silica sol is formed and adheres to the surface of the aluminum alloy substrate to form an aluminum alloy containing a sol layer. Then, a corrosion-resistant coating liquid is applied to the surface of the aluminum alloy containing the sol layer to obtain a corrosion-resistant aluminum alloy.

[0019] Furthermore, the preparation process of the corrosion-resistant coating liquid includes the following steps:

[0020] Ⅰ: Mix vinyl ester resin and fatty alcohol glycidyl ether, stir at a stirring rate of 70-90 r / min for 20-40 min, and pour the stirred solution into a reactor equipped with a stirrer, thermometer and nitrogen inlet;

[0021] II: Add hydrogen-containing silicone oil to the reactor, immerse the reactor in a water bath, control the temperature at 80-90℃, purge the reactor with nitrogen for protection, and stir at a stirring rate of 50-70 r / min for 3-5 h;

[0022] III: After the solution is mixed evenly, slowly add platinum catalyst to the reactor and observe the reaction process. When a viscous polymer is obtained, adjust the stirring speed to 300-500 r / min, then add fatty alcohol glycidyl ether to the reactor and stir and vibrate for 4-6 min to obtain a corrosion-resistant coating liquid.

[0023] Furthermore, in step I, the fatty alcohol glycidyl ether is any one of C12-C14 alcohol glycidyl ethers.

[0024] Furthermore, in step II, the hydrogen content of the hydrogen-containing silicone oil is 0.01% to 0.5%.

[0025] Further, in step III, the mass of the added platinum catalyst is 0.002 to 0.05% of the total mass of the vinyl ester resin and the hydrogen-containing silicone oil.

[0026] By adopting the above technical solution, the terminal alkenyl groups of vinyl ester resin and the silane-hydrogen bonds of hydrogen-containing silicone oil undergo a hydrosilylation reaction under the action of a platinum catalyst to form a high molecular weight organosilicon long chain, which is finally formed into a corrosion-resistant coating liquid under the action of fatty alcohol glycidyl ether.

[0027] The beneficial effects of this invention are:

[0028] This invention prepares an aluminum alloy with high strength and good plasticity by using aluminum, copper, iron, zirconium, magnesium, gallium, chromium, nickel, cerium and tin as alloying raw materials; and forms nano-silica sol during the hydrolysis of tetraethyl orthosilicate, which has certain adhesion and hydrophobic properties, preventing corrosive media from penetrating and preventing corrosion of the aluminum alloy matrix.

[0029] By grafting and copolymerizing vinyl ester resin and hydrogen-containing silicone oil, a high-strength silicone film is formed and adhered to the surface of an aluminum alloy containing a sol layer. The vinyl ester resin exhibits strong corrosion resistance, while the hydrogen-containing silicone oil possesses strong hydrophobicity, preventing corrosive media from penetrating and thus providing both strong corrosion resistance and strong hydrophobicity. Furthermore, the formed silicone film exhibits strong adhesion, enhancing the bond between the coating and the aluminum alloy substrate. This prevents the composite coating from easily detaching from the aluminum alloy substrate, effectively isolating the surrounding environment from affecting the surface properties of the aluminum alloy. This results in excellent corrosion resistance, ensuring long-term corrosion resistance, and is easy to implement, facilitating practical production and demonstrating broad application prospects.

[0030] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Detailed Implementation

[0031] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1

[0033] I. Preparation of Corrosion-Resistant Aluminum Alloys

[0034] (1) 92.37% aluminum was placed in a melting furnace, the furnace temperature was raised to 750℃ and held for 20 minutes to completely melt it. Then 0.2% copper, 0.1% iron, 3% zinc, 0.05% zirconium, 0.7% magnesium, 0.08% gallium, 0.2% chromium, 1.2% nickel, 0.1% cerium and 2% tin were added and melted at 750℃ for 4 hours. After complete melting, the mixture was degassed with argon gas to obtain an aluminum alloy solution.

[0035] (2) The temperature of the obtained aluminum alloy solution is measured by hand thermocouple. When the temperature of the solution is 700°C, it is taken out of the furnace. The metal mold is preheated to 190°C. The obtained aluminum alloy solution is quickly poured into the preheated mold and allowed to cool naturally to obtain the aluminum alloy matrix.

[0036] (3) At a temperature of 20℃, add 450ml of anhydrous ethanol, 30ml of deionized water and 2ml of ammonia to the reactor, then mix and stir evenly for 10min to obtain a mixed liquid ①, and put the obtained aluminum alloy substrate into the mixed liquid ①.

[0037] (4) Then slowly add 200ml of tetraethyl orthosilicate to the mixture ① to obtain mixture ②. Stir the mixture ② at 70℃ for 3 hours, let it stand for 1 hour, take it out and blow it dry, then cure it in the oven at 100℃ for 40 minutes, take it out and cool it to room temperature in the air to obtain the aluminum alloy containing the sol layer.

[0038] (5) Apply the corrosion-resistant coating liquid evenly to the aluminum alloy surface containing the sol layer, place it in an oven, and cure it at 70°C for 1 hour to obtain the corrosion-resistant coating attached to the aluminum alloy surface.

[0039] II. Preparation of Corrosion-Resistant Coating Liquid

[0040] Ⅰ: Mix 48g of vinyl ester resin and 60g of C12 alcohol glycidyl ether, stir at a stirring rate of 70r / min for 20min, and pour the stirred solution into a reactor equipped with a stirrer, thermometer and nitrogen inlet;

[0041] II: Add 16g of hydrogen-containing silicone oil to the reactor, immerse the reactor in a water bath, control the temperature at 80℃, purge the reactor with nitrogen for protection, and stir at a stirring rate of 50r / min for 3h.

[0042] III: After the solution is mixed evenly, 0.03g of platinum catalyst is slowly added to the reactor. The reaction process is observed and a viscous polymer is obtained. The stirring speed is adjusted to 300r / min. Then, 50g of C12 alcohol glycidyl ether is added to the reactor and stirred and shaken for 4min to obtain the corrosion-resistant coating liquid.

[0043] The corrosion-resistant coating liquid was applied to the surface of tinplate, and the adhesion of the coating was tested according to GB / T9286-2021. The test result showed that it was Grade 1, indicating that the corrosion-resistant coating liquid can stably adhere to the metal surface and enhance the bonding force between it and the aluminum alloy substrate. This makes the composite coating less likely to fall off the aluminum alloy substrate, thus achieving excellent corrosion resistance of the aluminum alloy surface.

[0044] Example 2

[0045] Preparation of corrosion-resistant aluminum alloys

[0046] (1) 89.48% aluminum was placed in a melting furnace, the furnace temperature was raised to 760℃ and held for 30 minutes to completely melt it. Then, 0.3% copper, 0.2% iron, 4% zinc, 0.08% zirconium, 0.8% magnesium, 0.09% gallium, 0.3% chromium, 1.6% nickel, 0.15% cerium and 3% tin were added and melted at a high temperature of 760℃ for 5 hours. After complete melting, the mixture was degassed with argon gas to obtain an aluminum alloy solution.

[0047] (2) The temperature of the obtained aluminum alloy solution is measured by hand thermocouple. When the temperature of the solution is 710°C, it is taken out of the furnace. The metal mold is preheated to 200°C. The obtained aluminum alloy solution is quickly poured into the preheated mold and allowed to cool naturally to obtain the aluminum alloy matrix.

[0048] (3) At a temperature of 30℃, add 500ml of anhydrous ethanol, 40ml of deionized water and 2.5ml of ammonia water to the reactor, then mix and stir evenly for 20min to obtain a mixed liquid ①, and put the obtained aluminum alloy substrate into the mixed liquid ①.

[0049] (4) Then slowly add 230 ml of tetraethyl orthosilicate to the mixture ① to obtain mixture ②. Stir the mixture ② at 80°C for 4 hours, let it stand for 2 hours, take it out and blow it dry, then cure it in the oven at 120°C for 45 minutes. Take it out and cool it to room temperature in the air to obtain the aluminum alloy containing the sol layer.

[0050] (5) Apply the corrosion-resistant coating liquid evenly to the aluminum alloy surface containing the sol layer, place it in an oven, and cure it at 80°C for 2 hours to obtain the corrosion-resistant coating attached to the aluminum alloy surface.

[0051] The preparation method of the corrosion-resistant coating liquid is the same as in Example 1.

[0052] Example 3

[0053] Preparation of corrosion-resistant aluminum alloys

[0054] (1) 85.63% aluminum was placed in a melting furnace, the furnace temperature was raised to 780℃ and held for 40 minutes to completely melt it. Then 0.4% copper, 0.25% iron, 5% zinc, 0.1% zirconium, 0.9% magnesium, 0.12% gallium, 0.4% chromium, 2% nickel, 0.2% cerium and 5% tin were added and melted at a high temperature of 780℃ for 6 hours. After complete melting, the mixture was degassed with argon gas to obtain an aluminum alloy solution.

[0055] (2) The temperature of the obtained aluminum alloy solution is measured by hand thermocouple. When the temperature of the solution is 720°C, it is taken out of the furnace. The metal mold is preheated to 210°C. The obtained aluminum alloy solution is quickly poured into the preheated mold and allowed to cool naturally to obtain the aluminum alloy matrix.

[0056] (3) At a temperature of 40℃, add 550ml of anhydrous ethanol, 50ml of deionized water and 4ml of ammonia to the reactor, then mix and stir evenly for 30min to obtain a mixed liquid ①, and put the obtained aluminum alloy substrate into the mixed liquid ①.

[0057] (4) Then slowly add 260ml of tetraethyl orthosilicate to the mixture ① to obtain mixture ②. Stir the mixture ② at 90℃ for 6 hours, let it stand for 3 hours, take it out and blow it dry, then cure it in the oven at 130℃ for 50 minutes, take it out and cool it to room temperature in the air to obtain the aluminum alloy containing the sol layer.

[0058] (5) Apply the corrosion-resistant coating liquid evenly to the aluminum alloy surface containing the sol layer, place it in an oven, and cure it at 90°C for 3 hours to obtain the corrosion-resistant coating attached to the aluminum alloy surface.

[0059] The preparation method of the corrosion-resistant coating liquid is the same as in Example 1.

[0060] Comparative Example 1

[0061] Preparation of corrosion-resistant aluminum alloys

[0062] (1) 89.48% aluminum was placed in a melting furnace, the furnace temperature was raised to 760℃ and held for 30 minutes to completely melt it. Then, 0.3% copper, 0.2% iron, 4% zinc, 0.08% zirconium, 0.8% magnesium, 0.09% gallium, 0.3% chromium, 1.6% nickel, 0.15% cerium and 3% tin were added and melted at a high temperature of 760℃ for 5 hours. After complete melting, the mixture was degassed with argon gas to obtain an aluminum alloy solution.

[0063] (2) The temperature of the obtained aluminum alloy solution is measured by hand thermocouple. When the temperature of the solution is 710°C, it is taken out of the furnace. The metal mold is preheated to 200°C. The obtained aluminum alloy solution is quickly poured into the preheated mold and allowed to cool naturally to obtain the aluminum alloy matrix.

[0064] (3) At a temperature of 30℃, add 500ml of anhydrous ethanol, 40ml of deionized water and 2.5ml of ammonia water to the reactor, then mix and stir evenly for 20min to obtain a mixed liquid ①, and put the obtained aluminum alloy substrate into the mixed liquid ①.

[0065] (4) Then slowly add 230 ml of tetraethyl orthosilicate to the mixture ① to obtain mixture ②. Stir the mixture ② at 80°C for 4 hours, let it stand for 2 hours, take it out and blow it dry, then cure it in an oven at 120°C for 45 minutes. After taking it out, cool it to room temperature in the air to obtain the corrosion-resistant aluminum alloy.

[0066] Performance testing

[0067] ① Corrosion resistance testing of the aluminum alloys prepared in Examples 1-3 and Comparative Example 1 of this invention:

[0068] A CHI660E electrochemical workstation was used, with an aluminum alloy sample as the working electrode, platinum as the counter electrode, and a saturated calomel electrode as the reference electrode. The corrosion resistance of the aluminum alloy was evaluated by testing the corrosion rate and corrosion current density. A 3.5% sodium chloride solution was used as the corrosion medium. The working frequency of the electrochemical workstation was 10 Hz. -2 -10 5 The frequency was Hz, the amplitude was 5mV, and the contact area of ​​the sample during the experiment was 2cm². 2 The test results are as follows:

[0069] Example 1 <![CDATA[2.598×10 -4 ]]> <![CDATA[6.348×10 -9 ]]> Example 2 <![CDATA[1.048×10 -4 ]]> <![CDATA[1.921×10 -9 ]]> Example 3 <![CDATA[2.314×10 -4 ]]> <![CDATA[4.028×10 -9 ]]> Comparative Example 1 <![CDATA[3.643×10 -3 ]]> <![CDATA[4.869×10 -6 ]]> Commercially available aluminum alloys <![CDATA[8.542×10 -2 ]]> <![CDATA[5.147×10 -4 ]]>

[0070] Note: The commercially available aluminum alloy was purchased from Guangdong Xingfa Aluminium Co., Ltd.

[0071] The data in the table show that the aluminum alloys prepared in Examples 1-3 of this invention have low corrosion rates and low corrosion current densities, indicating high charge transfer resistance and good corrosion resistance. In contrast, Comparative Example 1, which uses nano-silica sol as a coating alone, produces aluminum alloys with poor corrosion resistance. In contrast, commercially available aluminum alloys, which do not have a coating protection, have high corrosion rates, high corrosion current densities, and poor corrosion resistance.

[0072] ② Hydrophobicity test:

[0073] The water contact angle of the aluminum alloy was tested using an SDC-100S contact angle tester. The test results are as follows:

[0074] Example 1 121.1±1.2 Example 2 124.1±2.0 Example 3 122.1±1.5 Comparative Example 1 92.2±2.3 Commercially available aluminum alloys 39.3±2.0

[0075] Note: The commercially available aluminum alloy was purchased from Guangdong Xingfa Aluminium Co., Ltd.

[0076] The data in the table shows that the contact angle of the coating on the surface of the aluminum alloy prepared in Examples 1-3 of this invention is greater than 120°, thus exhibiting strong hydrophobic properties. This prevents corrosive media from penetrating and has a positive effect on the corrosion resistance of the aluminum alloy. In Comparative Example 1, the aluminum alloy prepared by using nano-silica sol as a coating alone has a certain degree of hydrophobicity, while commercially available aluminum alloys do not have a coating protection and have poor hydrophobic properties.

[0077] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A corrosion-resistant aluminum alloy, characterized in that, The corrosion-resistant aluminum alloy surface contains a sol layer and a corrosion-resistant coating; the aluminum alloy substrate comprises the following raw materials by weight percentage: 0.2-0.4% copper, 0.1-0.25% iron, 3-5% zinc, 0.05-0.1% zirconium, 0.7-0.9% magnesium, 0.08-0.12% gallium, 0.2-0.4% chromium, 1.2-2% nickel, 0.1-0.2% cerium, 2-5% tin, and the balance aluminum; the sol layer is formed by depositing nano-silica sol on the aluminum alloy surface; the corrosion-resistant coating is formed by coating a corrosion-resistant coating liquid onto the outside of the sol layer; the film-forming substance of the corrosion-resistant coating liquid is a grafted composite of vinyl ester resin and hydrogen-containing silicone oil; The preparation method of the corrosion-resistant coating liquid includes the following steps: Ⅰ: Mix vinyl ester resin and fatty alcohol glycidyl ether, stir at a stirring rate of 70-90 r / min for 20-40 min, and pour the stirred solution into a reactor equipped with a stirrer, thermometer and nitrogen inlet; II: Add hydrogen-containing silicone oil to the reactor, immerse the reactor in a water bath, control the temperature at 80-90℃, purge the reactor with nitrogen for protection, and stir at a stirring rate of 50-70 r / min for 3-5 h; III: After the solution is mixed evenly, slowly add platinum catalyst to the reactor and observe the reaction process. When a viscous polymer is obtained, adjust the stirring speed to 300-500 r / min, then add fatty alcohol glycidyl ether to the reactor and stir and vibrate for 4-6 min to obtain a corrosion-resistant coating liquid.

2. The corrosion-resistant aluminum alloy according to claim 1, characterized in that, In step I, the fatty alcohol glycidyl ether is any one of C12-C14 alcohol glycidyl ethers.

3. The corrosion-resistant aluminum alloy according to claim 1, characterized in that, In step II, the hydrogen content of the hydrogen-containing silicone oil is 0.01% to 0.5%.

4. The corrosion-resistant aluminum alloy according to claim 1, characterized in that, In step III, the mass of the added platinum catalyst is 0.002 to 0.05% of the total mass of the vinyl ester resin and the hydrogen-containing silicone oil.

5. A method for producing the corrosion-resistant aluminum alloy as described in claim 1, characterized in that, The production method includes the following steps: (1) Place aluminum into a melting furnace, raise the temperature of the furnace to 750-780℃, hold for 20-40 minutes to completely melt it, then add copper, iron, zinc, zirconium, magnesium, gallium, chromium, nickel, cerium and tin, and melt at a high temperature of 750-780℃ for 4-6 hours. After complete melting, degas the aluminum alloy to obtain the molten aluminum alloy. (2) The temperature of the obtained aluminum alloy melt is measured by hand thermocouple. When the temperature of the melt is 700-720°C, it is taken out of the furnace and quickly poured into a preheated mold. After it cools naturally, the aluminum alloy matrix is ​​obtained. (3) At a temperature of 20-40℃, add anhydrous ethanol, deionized water and ammonia to the reactor, then mix and stir evenly for 10-30 minutes to obtain a mixture ①, and put the aluminum alloy matrix obtained in step (2) into the mixture ①; (4) Then, slowly add tetraethyl orthosilicate to mixture ① to obtain mixture ②. Stir the mixture at 70-90℃, let it stand, remove it, blow dry and solidify it to obtain a mixture containing... Aluminum alloy for the sol layer; (5) Apply the corrosion-resistant coating liquid evenly to the aluminum alloy surface containing the sol layer, place it in an oven, and cure it at a temperature of 70-90℃ for 1-3 hours to obtain the corrosion-resistant coating attached to the aluminum alloy surface.

6. The method for producing a corrosion-resistant aluminum alloy according to claim 5, characterized in that, In step (2), the preheated mold is heated to 190-210°C.

7. The method for producing a corrosion-resistant aluminum alloy according to claim 5, characterized in that, In step (4), the reaction time is 3 to 6 hours; the settling time is 1 to 3 hours.

8. The method for producing a corrosion-resistant aluminum alloy according to claim 5, characterized in that, In step (4), the curing temperature is 100-130℃ and the time is 40-50min.