Rust-proof high-magnesium aluminum alloy round cast ingot and manufacturing method thereof

Abstract

The invention discloses a rust-proof high-magnesium aluminum alloy round cast ingot and a manufacturing method thereof, and belongs to the technical field of magnesium aluminum alloys, and the rust-proof high-magnesium aluminum alloy round cast ingot comprises the following chemical components by mass percent: 8.0-12.0% of magnesium (Mg); aluminum (Al): the balance as a base metal; manganese (Mn): 0.3% to 0.8%; zinc (Zn): 0.5% to 1.5%; not more than 0.2% of copper (Cu); silicon (Si): not more than 0.5%; no more than 0.15% of iron (Fe); 0.1% to 0.3% of rare earth elements (mainly La and Ce, in total); the content of each of the other inevitable impurity elements does not exceed 0.05%, and the total content of the other inevitable impurity elements does not exceed 0.3%. By accurately controlling the mass percent of key chemical components such as magnesium, aluminum, manganese, zinc, copper, silicon, iron and rare earth elements and giving a preferable range, the antirust high-magnesium aluminum alloy round cast ingot provided by the invention has excellent corrosion resistance and mechanical strength, and meanwhile, the lightweight property and good machinability of the alloy are kept.

Description

Technical Field

[0001] The invention belongs to the technical field of magnesium-aluminum alloys, and in particular relates to a rust-proof high-magnesium-aluminum alloy round ingot and a manufacturing method thereof. Background Art

[0002] As an important lightweight metal material, magnesium-aluminum alloy has been widely used in aerospace, automobile manufacturing, electronics industry, communication equipment and other fields due to its advantages of low density, high strength, good corrosion resistance and easy processing and forming. However, traditional magnesium-aluminum alloy is prone to corrosion in certain specific environments, such as humid, high temperature or corrosive media, which affects its service life and performance.

[0003] Limitations of existing magnesium-aluminum alloy round ingots: 1. Insufficient anti-rust performance: Traditional magnesium-aluminum alloy round ingots have insufficient anti-rust performance. Especially in harsh environments, corrosion spots are easily formed on their surfaces, resulting in a decrease in material performance.

[0004] 2. Low yield: During the preparation process, due to improper process control or unstable raw material quality, defects such as cracks and inclusions may easily appear in the ingot, thereby reducing the yield.

[0005] 3. Unstable mechanical properties: Due to differences in alloy composition and preparation process, traditional magnesium-aluminum alloy round ingots may have fluctuations in mechanical properties, affecting their application effects. Summary of the invention

[0006] The purpose of the present invention is to provide a rust-proof high-magnesium aluminum alloy round ingot and a manufacturing method thereof in view of the existing problems.

[0007] The present invention is achieved through the following technical solutions: A rust-proof high-magnesium aluminum alloy round ingot, characterized by comprising the following chemical components and their mass percentages: Magnesium (Mg): 8.0% to 12.0%, preferably 9.5% to 11.5%, to provide excellent corrosion resistance and mechanical strength; Aluminum (Al): the balance, as a base metal, to ensure the lightness and good processability of the alloy; Manganese (Mn): 0.3% to 0.8%, preferably 0.4% to 0.7%, to improve the strength and hardness of the alloy; Zinc (Zn): 0.5% to 1.5%, preferably 0.8% to 1.2%, to further enhance the corrosion resistance of the alloy; Copper (Cu): not more than 0.2%, to avoid adverse effects on the properties of the alloy; Silicon (Si): not more than 0.5%, to maintain the purity and stability of the alloy; Iron (Fe): not more than 0.15%, to reduce the impact of impurities on the properties of the alloy; Rare earth elements (mainly La and Ce, in total): 0.1% to 0.3%, preferably 0.15% to 0.25%, to significantly improve the corrosion resistance and heat resistance of the alloy; Other unavoidable impurity elements: not more than 0.05% each, not more than 0.3% in total.

[0008] Furthermore, the method for casting rust-proof high-magnesium aluminum alloy round ingots comprises the following steps: a. Raw material preparation: accurately prepare raw materials according to the chemical composition and mass percentage thereof as described in claim 1; b. Melting: Put the prepared raw materials into the melting furnace, heat until the alloy is completely melted, and use electromagnetic stirring technology to ensure uniform distribution of alloy components; c. Refining and degassing: Refining the melt to remove impurities and gases to improve the purity and quality of the alloy. A rotary jet degassing device is used in this step; d. Composition detection and adjustment: Detect the composition of the melt and make necessary composition adjustments based on the test results to ensure that the alloy composition meets the design requirements in claim 1; e. Casting: Pour the refined melt into a circular mold preheated to an appropriate temperature and cast using continuous casting technology; f. Cooling and heat treatment: After casting, the ingot is allowed to cool naturally to room temperature and then undergoes solution treatment; g. Surface treatment: The surface of the ingot is cleaned and polished to remove surface defects and oxide layers. Ultrasonic cleaning machines and high-precision polishing machines are used in this step; h. Quality inspection: Conduct quality inspections such as chemical composition analysis, mechanical property testing, and metallographic structure inspection on the ingot to ensure that the ingot meets the design requirements; i. Packaging and storage: Qualified ingots shall be packaged and stored in a dry and well-ventilated environment.

[0009] Furthermore, in the smelting step b, it also includes online composition detection and real-time adjustment of the melt to ensure the accuracy and stability of the alloy composition.

[0010] Furthermore, in the casting step e, the following technical features superior to the prior art are also included: e1. Circular mold preheating and temperature control: Preheat the circular mold to a precise temperature range of 250°C to 300°C and maintain the temperature stable through an intelligent temperature control system to reduce thermal stress during casting and improve the structural uniformity of the ingot; e2. Optimization of casting speed and electromagnetic vibration: The casting speed is precisely controlled between 20 and 25 meters per minute, and a high-frequency electromagnetic vibration device is used to micro-vibrate the melt to reduce pores and inclusions in the ingot; e3. Improvement of mold material and coating: Use mold material with high thermal conductivity and high wear resistance, and apply a coating with excellent lubricity and corrosion resistance on the inner surface of the mold to extend the service life of the mold and improve the demoulding effect and surface finish of the ingot.

[0011] Furthermore, in the cooling and heat treatment step f, the following technical features superior to the prior art are also included: f1. Innovation in solution treatment and cooling methods: The solution treatment temperature is precisely controlled between 500°C and 530°C, the holding time is optimized to 4 to 5 hours, and a composite cooling method of rapid water quenching combined with subsequent air cooling is adopted to achieve rapid and uniform distribution of alloy elements and reduce the risk of deformation and cracking during heat treatment; f2. Optimization of aging treatment parameters: The aging treatment temperature is set between 180°C and 220°C, and the holding time is extended to 8 hours to 10 hours to promote the uniform precipitation and growth of the precipitated phase and improve the mechanical strength and corrosion resistance of the alloy; f3. Surface treatment technology after heat treatment: After the heat treatment is completed, shot peening is used to refine the surface of the ingot to further improve the hardness and wear resistance of the ingot surface, while enhancing its fatigue resistance and corrosion resistance.

[0012] Compared with the prior art, the present invention has the following advantages: 1. By precisely controlling the mass percentages of key chemical components such as magnesium, aluminum, manganese, zinc, copper, silicon, iron and rare earth elements, and providing preferred ranges, the rust-proof high-magnesium aluminum alloy round ingot provided by the present invention has excellent corrosion resistance and mechanical strength, while maintaining the lightness and good processability of the alloy. This optimized chemical composition ratio enables the alloy to perform well in a variety of environments, especially in terms of corrosion resistance.

[0013] 2. The present invention adopts a number of advanced technologies in the key steps of smelting, refining and degassing, component detection and adjustment, casting, cooling and heat treatment, and surface treatment. For example, electromagnetic stirring technology ensures the uniform distribution of alloy components; the rotary jet degassing device effectively removes impurities and gases in the melt; online component detection and real-time adjustment ensure the accuracy and stability of alloy components; the high-frequency electromagnetic vibration device reduces pores and inclusions in the ingot; the intelligent temperature control system maintains the stability of the mold temperature and improves the uniformity of the ingot structure.

[0014] 3. In the cooling and heat treatment steps of the present invention, by precisely controlling the solution treatment temperature and holding time, and adopting a composite cooling method of rapid water quenching combined with subsequent air cooling, the alloy elements are quickly and evenly distributed, reducing the risk of deformation and cracking during the heat treatment process. At the same time, the optimized aging treatment parameters further promote the uniform precipitation and growth of the precipitated phase, significantly improving the mechanical strength and corrosion resistance of the alloy.

[0015] 4. After the heat treatment is completed, the present invention uses shot peening to refine the surface of the ingot, which not only improves the hardness and wear resistance of the ingot surface, but also enhances its fatigue resistance and corrosion resistance. This surface treatment technology enables the ingot to maintain excellent performance even in harsh environments. DETAILED DESCRIPTION Example

[0016] A rust-proof high-magnesium aluminum alloy round ingot, characterized by comprising the following chemical components and their mass percentages: Magnesium (Mg): 9.5%, to provide excellent corrosion resistance and mechanical strength; Aluminum (Al): the balance, as the base metal, to ensure the lightness and good processability of the alloy; Manganese (Mn): 0.4%, to improve the strength and hardness of the alloy; Zinc (Zn): 0.8%, to further enhance the corrosion resistance of the alloy; Copper (Cu): 0.1%, to avoid adverse effects on the properties of the alloy; Silicon (Si): 0.4%, to maintain the purity and stability of the alloy; Iron (Fe): 0.1%, to reduce the impact of impurities on the properties of the alloy; Rare earth elements (mainly La and Ce, total): 0.15%, significantly improve the corrosion resistance and heat resistance of the alloy; Other unavoidable impurity elements: total 0.2%.

[0017] Furthermore, the method for casting rust-proof high-magnesium aluminum alloy round ingots comprises the following steps: a. Raw material preparation: accurately prepare raw materials according to the chemical composition and mass percentage thereof as described in claim 1; b. Melting: Put the prepared raw materials into the melting furnace, heat until the alloy is completely melted, and use electromagnetic stirring technology to ensure uniform distribution of alloy components; c. Refining and degassing: Refining the melt to remove impurities and gases to improve the purity and quality of the alloy. A rotary jet degassing device is used in this step; d. Composition detection and adjustment: Detect the composition of the melt and make necessary composition adjustments based on the test results to ensure that the alloy composition meets the design requirements in claim 1; e. Casting: Pour the refined melt into a circular mold preheated to an appropriate temperature and cast using continuous casting technology; f. Cooling and heat treatment: After casting, the ingot is allowed to cool naturally to room temperature and then undergoes solution treatment; g. Surface treatment: The surface of the ingot is cleaned and polished to remove surface defects and oxide layers. Ultrasonic cleaning machines and high-precision polishing machines are used in this step; h. Quality inspection: Conduct quality inspections such as chemical composition analysis, mechanical property testing, and metallographic structure inspection on the ingot to ensure that the ingot meets the design requirements; i. Packaging and storage: Qualified ingots shall be packaged and stored in a dry and well-ventilated environment.

[0018] Furthermore, in the smelting step b, it also includes online composition detection and real-time adjustment of the melt to ensure the accuracy and stability of the alloy composition.

[0019] In the casting step e, the following technical features superior to the prior art are also included: e1. Circular mold preheating and temperature control: Preheat the circular mold to 250°C and maintain the temperature stable through the intelligent temperature control system to reduce thermal stress during the casting process and improve the structural uniformity of the ingot; e2. Optimization of casting speed and electromagnetic vibration: The casting speed is precisely controlled at 20 meters per minute, and a high-frequency electromagnetic vibration device is used to micro-vibrate the melt to reduce pores and inclusions in the ingot; e3. Improvement of mold material and coating: Use mold material with high thermal conductivity and high wear resistance, and apply a coating with excellent lubricity and corrosion resistance on the inner surface of the mold to extend the service life of the mold and improve the demoulding effect and surface finish of the ingot.

[0020] In the cooling and heat treatment step f, the following technical features superior to the prior art are also included: f1. Innovation in solution treatment and cooling methods: The solution treatment temperature is precisely controlled at 500°C, the holding time is optimized to 4 hours, and a composite cooling method of rapid water quenching combined with subsequent air cooling is adopted to achieve rapid and uniform distribution of alloy elements and reduce the risk of deformation and cracking during heat treatment; f2. Optimization of aging treatment parameters: The aging treatment temperature was set to 180°C and the holding time was extended to 8 hours to promote the uniform precipitation and growth of the precipitated phase and improve the mechanical strength and corrosion resistance of the alloy; f3. Surface treatment technology after heat treatment: After the heat treatment is completed, shot peening is used to refine the surface of the ingot to further improve the hardness and wear resistance of the ingot surface, while enhancing its fatigue resistance and corrosion resistance.

[0021] The chemical composition of the rust-proof high-magnesium aluminum alloy round ingot obtained in Example 1 is qualified, the average grain size is about 50μm, the grains are evenly distributed, there is no obvious abnormal growth phenomenon, the second phase particles are evenly distributed, the morphology is regular, the number is moderate, there is no obvious agglomeration phenomenon, no obvious defects such as cracks, inclusions, pores, etc. are found, and the yield rate reaches 94.27%. Example

[0022] A rust-proof high-magnesium aluminum alloy round ingot, characterized by comprising the following chemical components and their mass percentages: Magnesium (Mg): 11.5%, to provide excellent corrosion resistance and mechanical strength; Aluminum (Al): the balance, as the base metal, to ensure the lightness and good processability of the alloy; Manganese (Mn): 0.7%, to improve the strength and hardness of the alloy; Zinc (Zn): 1.2%, to further enhance the corrosion resistance of the alloy; Copper (Cu): 0.2%, to avoid adverse effects on the properties of the alloy; Silicon (Si): 0.5%, to maintain the purity and stability of the alloy; Iron (Fe): 0.15%, to reduce the impact of impurities on the properties of the alloy; Rare earth elements (mainly La and Ce, total): 0.25%, significantly improve the corrosion resistance and heat resistance of the alloy; Other unavoidable impurity elements: total 0.1%.

[0023] Furthermore, the method for casting rust-proof high-magnesium aluminum alloy round ingots comprises the following steps: a. Raw material preparation: accurately prepare raw materials according to the chemical composition and mass percentage thereof as described in claim 1; b. Melting: Put the prepared raw materials into the melting furnace, heat until the alloy is completely melted, and use electromagnetic stirring technology to ensure uniform distribution of alloy components; c. Refining and degassing: Refining the melt to remove impurities and gases to improve the purity and quality of the alloy. A rotary jet degassing device is used in this step; d. Composition detection and adjustment: Detect the composition of the melt and make necessary composition adjustments based on the test results to ensure that the alloy composition meets the design requirements in claim 1; e. Casting: Pour the refined melt into a circular mold preheated to an appropriate temperature and cast using continuous casting technology; f. Cooling and heat treatment: After casting, the ingot is allowed to cool naturally to room temperature and then undergoes solution treatment; g. Surface treatment: The surface of the ingot is cleaned and polished to remove surface defects and oxide layers. Ultrasonic cleaning machines and high-precision polishing machines are used in this step; h. Quality inspection: Conduct quality inspections such as chemical composition analysis, mechanical property testing, and metallographic structure inspection on the ingot to ensure that the ingot meets the design requirements; i. Packaging and storage: Qualified ingots shall be packaged and stored in a dry and well-ventilated environment.

[0024] Furthermore, in the smelting step b, it also includes online composition detection and real-time adjustment of the melt to ensure the accuracy and stability of the alloy composition.

[0025] Furthermore, in the casting step e, the following technical features superior to the prior art are also included: e1. Circular mold preheating and temperature control: Preheat the circular mold to 300°C and maintain the temperature stable through the intelligent temperature control system to reduce thermal stress during the casting process and improve the uniformity of the ingot structure; e2. Optimization of casting speed and electromagnetic vibration: The casting speed is precisely controlled at 25 meters per minute, and a high-frequency electromagnetic vibration device is used to micro-vibrate the melt to reduce pores and inclusions in the ingot; e3. Improvement of mold material and coating: Use mold material with high thermal conductivity and high wear resistance, and apply a coating with excellent lubricity and corrosion resistance on the inner surface of the mold to extend the service life of the mold and improve the demoulding effect and surface finish of the ingot.

[0026] In the cooling and heat treatment step f, the following technical features superior to the prior art are also included: f1. Innovation in solution treatment and cooling methods: The solution treatment temperature is precisely controlled at 530°C, the holding time is optimized to 5 hours, and a composite cooling method of rapid water quenching combined with subsequent air cooling is adopted to achieve rapid and uniform distribution of alloy elements and reduce the risk of deformation and cracking during heat treatment; f2. Optimization of aging treatment parameters: The aging treatment temperature was set to 220°C and the holding time was extended to 10 hours to promote uniform precipitation and growth of the precipitated phase and improve the mechanical strength and corrosion resistance of the alloy; f3. Surface treatment technology after heat treatment: After the heat treatment is completed, shot peening is used to refine the surface of the ingot to further improve the hardness and wear resistance of the ingot surface, while enhancing its fatigue resistance and corrosion resistance.

[0027] The chemical composition of the rust-proof high-magnesium aluminum alloy round ingot obtained in Example 2 is qualified, the average grain size is about 50μm, the grains are evenly distributed, there is no obvious abnormal growth phenomenon, the second phase particles are evenly distributed, the morphology is regular, the number is moderate, there is no obvious agglomeration phenomenon, no obvious defects such as cracks, inclusions, pores, etc. are found, and the yield rate reaches 94.02%. Example

[0028] A rust-proof high-magnesium aluminum alloy round ingot, characterized by comprising the following chemical components and their mass percentages: Magnesium (Mg): 10.9%, to provide excellent corrosion resistance and mechanical strength; Aluminum (Al): the balance, as the base metal, to ensure the lightness and good processability of the alloy; Manganese (Mn): 0.6%, to improve the strength and hardness of the alloy; Zinc (Zn): 1.1%, to further enhance the corrosion resistance of the alloy; Copper (Cu): 0.17%, to avoid adverse effects on the properties of the alloy; Silicon (Si): 0.31%, to maintain the purity and stability of the alloy; Iron (Fe): 0.085%, to reduce the impact of impurities on the properties of the alloy; Rare earth elements (mainly La and Ce, total): 0.23%, significantly improve the corrosion resistance and heat resistance of the alloy; Other unavoidable impurity elements: not more than 0.21% in total.

[0029] Furthermore, the method for casting rust-proof high-magnesium aluminum alloy round ingots comprises the following steps: a. Raw material preparation: accurately prepare raw materials according to the chemical composition and mass percentage thereof as described in claim 1; b. Melting: Put the prepared raw materials into the melting furnace, heat until the alloy is completely melted, and use electromagnetic stirring technology to ensure uniform distribution of alloy components; c. Refining and degassing: Refining the melt to remove impurities and gases to improve the purity and quality of the alloy. A rotary jet degassing device is used in this step; d. Composition detection and adjustment: Detect the composition of the melt and make necessary composition adjustments based on the test results to ensure that the alloy composition meets the design requirements in claim 1; e. Casting: Pour the refined melt into a circular mold preheated to an appropriate temperature and cast using continuous casting technology; f. Cooling and heat treatment: After casting, the ingot is allowed to cool naturally to room temperature and then undergoes solution treatment; g. Surface treatment: The surface of the ingot is cleaned and polished to remove surface defects and oxide layers. Ultrasonic cleaning machines and high-precision polishing machines are used in this step; h. Quality inspection: Conduct quality inspections such as chemical composition analysis, mechanical property testing, and metallographic structure inspection on the ingot to ensure that the ingot meets the design requirements; i. Packaging and storage: Qualified ingots shall be packaged and stored in a dry and well-ventilated environment.

[0030] Furthermore, in the smelting step b, it also includes online composition detection and real-time adjustment of the melt to ensure the accuracy and stability of the alloy composition.

[0031] Furthermore, in the casting step e, the following technical features superior to the prior art are also included: e1. Circular mold preheating and temperature control: Preheat the circular mold to 289°C and maintain the temperature stable through the intelligent temperature control system to reduce thermal stress during the casting process and improve the structural uniformity of the ingot; e2. Optimization of casting speed and electromagnetic vibration: The casting speed is precisely controlled at 22 meters per minute, and a high-frequency electromagnetic vibration device is used to micro-vibrate the melt to reduce pores and inclusions in the ingot; e3. Improvement of mold material and coating: Use mold material with high thermal conductivity and high wear resistance, and apply a coating with excellent lubricity and corrosion resistance on the inner surface of the mold to extend the service life of the mold and improve the demoulding effect and surface finish of the ingot.

[0032] Furthermore, in the cooling and heat treatment step f, the following technical features superior to the prior art are also included: f1. Innovation in solution treatment and cooling methods: The solution treatment temperature is precisely controlled at 516°C, the holding time is optimized to 4.6 hours, and a composite cooling method of rapid water quenching combined with subsequent air cooling is adopted to achieve rapid and uniform distribution of alloy elements and reduce the risk of deformation and cracking during heat treatment; f2. Optimization of aging treatment parameters: The aging treatment temperature was set to 201°C and the holding time was extended to 9.2 hours to promote the uniform precipitation and growth of the precipitated phase and improve the mechanical strength and corrosion resistance of the alloy; f3. Surface treatment technology after heat treatment: After the heat treatment is completed, shot peening is used to refine the surface of the ingot to further improve the hardness and wear resistance of the ingot surface, while enhancing its fatigue resistance and corrosion resistance.

[0033] The chemical composition of the rust-proof high-magnesium aluminum alloy round ingot obtained in Example 3 is qualified, the average grain size is about 50μm, the grains are evenly distributed, there is no obvious abnormal growth phenomenon, the second phase particles are evenly distributed, the morphology is regular, the number is moderate, there is no obvious agglomeration phenomenon, no obvious defects such as cracks, inclusions, pores, etc. are found, and the yield rate reaches 93.57%.

[0034] The mechanical properties of the rust-proof high-magnesium aluminum alloy round ingot embodiments 1-3 are as follows:

[0035] The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification, should be within the protection scope of the present invention.

Claims

1. A rust-proof high-magnesium aluminum alloy round ingot, characterized in that: Includes the following chemical components and their mass percentages: Magnesium (Mg): 8.0% to 12.0%; Aluminum (Al): balance, as base metal; Manganese (Mn): 0.3% to 0.8%; Zinc (Zn): 0.5% to 1.5%; Copper (Cu): not more than 0.2%; Silicon (Si): not more than 0.5%; Iron (Fe): not more than 0.15%; Rare earth elements (mainly La and Ce, total): 0.1% to 0.3%; Other unavoidable impurity elements: not more than 0.05% each, not more than 0.3% in total.

2. A method for manufacturing the rust-proof high-magnesium aluminum alloy round ingot according to claim 1, characterized in that: The following steps are involved: a. Raw material preparation: preparing raw materials according to the chemical composition and mass percentage thereof as described in claim 1; b. Melting: Put the prepared raw materials into the melting furnace, heat until the alloy is completely melted, and stir them fully. In this step, electromagnetic stirring technology is used; c. Refining and degassing: The melt is refined to remove impurities and gases. In this step, a rotary jet degassing device is used; d. Composition detection and adjustment: Detect the composition of the melt and make necessary composition adjustments based on the test results to ensure that the alloy composition meets the design requirements in claim 1; e. Casting: Pour the refined melt into a circular mold preheated to an appropriate temperature for casting. In this step, continuous casting technology is used; f. Cooling and heat treatment: After casting, the ingot is allowed to cool naturally to room temperature and undergo solution treatment; g. Surface treatment: cleaning, polishing and other treatments are performed on the surface of the ingot to remove surface defects and oxide layers. In this step, ultrasonic cleaning machines and high-precision polishing machines are used; h. Quality inspection: Conduct quality inspections such as chemical composition analysis, mechanical property testing, and metallographic structure inspection on the ingot to ensure that the ingot meets the design requirements; i. Packaging and storage: Qualified ingots shall be packaged and stored in a dry and well-ventilated environment.

3. The method for manufacturing rust-proof high-magnesium aluminum alloy round ingot according to claim 2, characterized in that: In the smelting step b, it also includes online composition detection and real-time adjustment of the melt.

4. The method for manufacturing rust-proof high-magnesium aluminum alloy round ingot according to claim 2, characterized in that: In the casting step e, the following technical features superior to the prior art are also included: e1. Circular mold preheating and temperature control: Preheat the circular mold to a precise temperature range of 250°C to 300°C and maintain the temperature stable through an intelligent temperature control system; e2. Optimization of casting speed and electromagnetic vibration: The casting speed is precisely controlled between 20 and 25 meters per minute, and a high-frequency electromagnetic vibration device is used to perform micro-vibration treatment on the melt; e3. Improvement of mold material and coating: Use mold material with high thermal conductivity and high wear resistance, and apply a coating with excellent lubricity and corrosion resistance on the inner surface of the mold to extend the service life of the mold.

5. The method for manufacturing rust-proof high-magnesium aluminum alloy round ingot according to claim 2, characterized in that: In the cooling and heat treatment step f according to claim 2, the following technical features superior to the prior art are also included: f1. Innovation in solution treatment and cooling methods: The solution treatment temperature is precisely controlled between 500°C and 530°C, the holding time is optimized to 4 to 5 hours, and a composite cooling method of rapid water quenching combined with subsequent air cooling is adopted; f2. Optimization of aging treatment parameters: set the aging treatment temperature to between 180°C and 220°C, and extend the holding time to 8 to 10 hours; f3. Surface treatment technology after heat treatment: After the heat treatment is completed, the surface is treated by shot peening to refine the grain structure of the ingot surface.

Images