A method for manufacturing a hot-dip aluminum-zinc-silicon-magnesium rare earth alloy and the alloy thereof.

Abstract

A method for manufacturing a hot-dip aluminum-zinc-silicon-magnesium-rare earth alloy and the alloy thereof, comprising: 1) making a material container using pure aluminum and pure zinc materials; 2) using passivated magnesium particles to make silicon particles and rare earth particles, wherein the particle size of the silicon particles and rare earth particles is ≤10mm; 3) loading the granular materials into a zinc container or an aluminum container, wherein the zinc container is filled with silicon particles or magnesium particles, and the aluminum container is filled with rare earth particles; 4) sealing the container opening with pure zinc or pure aluminum materials; 5) adding pure aluminum ingots and pure zinc ingots into a smelting furnace for melting, and after complete melting, adding the material container into the furnace in the order of silicon, magnesium, and rare earth in order of melting, and after the furnace temperature reaches the tapping temperature, stopping the power and waiting for 1-3 minutes, then skimming off the slag and casting. The alloy of this invention has high purity, good fluidity and adhesion of the alloy liquid, and the resulting coating has a thin and uniform thickness, fine grain size, high strength, good gloss, and excellent corrosion resistance, wear resistance, paintability, good processing and forming performance, and self-healing properties.

Description

Technical Field

[0001] This invention relates to the field of hot-dip alloy metallurgy technology, and in particular to a method for manufacturing a hot-dip aluminum-zinc-silicon-magnesium-rare earth alloy and the alloy thereof. Background Technology

[0002] Currently, the main method for corrosion protection of steel materials is still surface coating. However, with the development of science and technology, some special operating environments and scenarios have placed higher demands on the corrosion resistance, wear resistance, processability, and service life of steel materials. To meet these requirements, in recent years, researchers in corrosion protection technology have developed many new coating alloys to meet different needs, such as zinc-aluminum-magnesium, aluminum-zinc-silicon-magnesium, and aluminum-zinc-silicon rare earth alloys. The application of these coating materials has given steel materials superior corrosion resistance in different environments, 2 to 6 times higher than traditional hot-dip galvanized sheets. Some of these alloys are resistant to high-temperature corrosion, showing no discoloration or deformation at 300℃; some are resistant to seawater corrosion, and some are resistant to soil corrosion. They all have good paintability and processability and are gradually replacing traditional galvanized sheets in widespread and long-term use worldwide. These alloys are basically produced using pure metals or alloys as raw materials, including remelted aluminum ingots, magnesium ingots, industrial silicon, and lanthanum-cerium alloys.

[0003] While these new alloy coating materials have shown varying degrees of performance improvement, there is still room for further development. Furthermore, the increasing variety of elements in the alloy makes production more challenging. This is primarily due to the complex alloy composition and the significant differences in density and melting point among each alloying element. For example, the density of Al is 2.7 g / cm³. 3 Zn 7.2g / cm 3 Si 2.3 g / cm 3 Mg 1.7 g / cm³ 3 Lanthanum-cerium alloy has a content of 6.3–6.6 g / cm³. 3The largest of these elements is 4.23 times the smallest. The melting points of Al, Zn, Si, Mg, and La are 650℃, while those of lanthanum-cerium alloys, which are rare earth sources, range from 816 to 890℃, with the highest being 3.36 times the lowest. Therefore, during the smelting process, the melting temperatures of elements such as Al, Zn, Si, Mg, La, and Ce differ significantly, resulting in varying melting times. The large differences in specific gravity during production cause some elemental metal blocks to float on the liquid surface while others sink to the bottom of the furnace. Si and Mg elements floating on the liquid metal surface not only constitute a small proportion of the alloy but are also highly susceptible to oxidation, leading to losses and substandard alloy composition. This poses difficulties for quality control and production. To address this issue, some existing technologies employ the intermediate alloy method. This method requires the production of multiple intermediate alloys, resulting in complex processes and significant losses from repeated smelting. Some methods use a bell jar method to force floating elemental metal blocks into the liquid. While this can control the floating of the metal blocks to some extent, the blocks quickly break into smaller pieces and continue to float, making it impossible to completely solve the oxidation and burn-off problem. Furthermore, the bell jar is easily corroded by the molten alloy, increasing impurities in the alloy. Since the impurity content of the alloy is required to be extremely low, this can easily lead to excessive impurities in the product. Meanwhile, denser rare earth elements tend to sink to the bottom of the furnace. During the smelting process, it is difficult to judge their degree of melting, making it difficult to control the smelting time. Too long a time increases the oxidation of other elements, while too short a time results in insufficient melting of the rare earth elements, causing segregation or substandard composition.

[0004] Chinese patent CN112725670A discloses a hot-dip galvanized aluminum alloy and its manufacturing method. Its chemical composition (wt%) is: Al 52-56wt%, Si 1.5-1.8%, rare earth 0.05-0.1%, Fe≤0.15%, Cu≤0.03%, Pb≤0.02%, Cd≤0.01%, with the balance being Zn. This alloy adds silicon and rare earth elements to hot-dip galvanized, hot-dip aluminized, and hot-dip aluminized zinc alloys, improving alloy performance and addressing issues such as poor corrosion resistance or unrealistic machinability inherent in single or simple alloys. However, it has shortcomings. First, the variety of elements in the alloy affects the overall performance; the elemental complementarity is not yet complete, and there is still room for improvement in alloy performance. Second, the alloy production method involves many complex steps. The production process first prepares intermediate alloys such as aluminum-silicon and zinc-aluminum, requiring multiple smelting stages. The problems of high metal element loss and low yield are not improved. Melting aluminum first and then adding zinc prolongs the smelting time, increasing energy consumption. Using intermediate alloys also increases the difficulty of composition adjustment. The process has not solved problems such as the slow melting of alloy blocks at the bottom of the furnace during rare earth smelting due to their high specific gravity, and the difficulty in judging the melting rate. Therefore, its production process is not suitable for large-scale industrial production, and the high cost also affects the competitiveness of the products. Summary of the Invention

[0005] The purpose of this invention is to provide a method for manufacturing a hot-dip aluminum-zinc-silicon-magnesium rare earth alloy and the alloy itself. The alloy has high purity, good fluidity and adhesion in the alloy liquid, and forms a thin, uniform coating with fine grains, high strength, and good gloss. It also possesses excellent corrosion resistance, wear resistance, paintability, good processability, and self-healing properties. Therefore, when applied to the field of steel corrosion protection, it can effectively improve the comprehensive performance of steel, including corrosion resistance, heat resistance, and weldability. This alloy is made by adding magnesium to existing hot-dip galvanized aluminum-zinc-silicon-magnesium rare earth alloys. Therefore, the density of this alloy is lower than that of existing zinc-aluminum-silicon-rare earth alloys. With the same coating thickness, the same weight of aluminum-zinc-silicon-magnesium rare earth alloy liquid can coat a larger area of ​​steel sheet than existing zinc-aluminum alloy liquids, saving resources and offering better economic benefits than coating other zinc-aluminum alloy materials.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] A method for manufacturing a hot-dip aluminum-zinc-silicon-magnesium rare earth alloy includes the following steps:

[0008] 1) Preparation of material tanks: Material tanks are made of pure aluminum and pure zinc materials, namely zinc tanks and aluminum tanks; the material tanks are made by turning, stamping or casting, and the tank body is machined with 2 to 3 through holes ≤5mm.

[0009] The required material canisters are made of pure aluminum and pure zinc, with raw material grades no lower than the national standard for remelted aluminum ingots (Al99.7) and zinc ingots (Zn99.995). The canisters can be manufactured using three methods: turning, stamping, or casting, with the choice made based on needs and production costs. The canisters can also be made in various shapes and sizes as required. After machining, 2-3 through holes ≤5mm are machined on the canister body for safety purposes.

[0010] 2) Granulation: Passivated magnesium particles are used to make silicon particles and rare earth particles. The particle size of silicon particles and rare earth particles is ≤10mm; the rare earth is lanthanum-cerium alloy SLMLaCe-4.

[0011] The raw material magnesium is purified into granules using magnesium ingots Mg9990. Industrial silicon Si1101 and rare earth lanthanum-cerium alloy SLMLaCe-4 are also granulated into particles with a size no larger than 10 mm. All granular materials should be kept dry and protected from moisture.

[0012] 3) Packing: The granular material obtained in step 2) above is packed into zinc cans or aluminum cans. The zinc cans are filled with silicon or magnesium particles with lower density, and the aluminum cans are filled with rare earth alloy particles with higher density.

[0013] 4) Sealing the can: Seal the can opening with pure zinc or pure aluminum materials; use pure zinc plates and seal the can opening by stamping; or use liquid zinc or aluminum-zinc alloy liquid and cast the can opening by casting.

[0014] The sealing material is a zinc plate of a certain thickness, liquid zinc, or aluminum-zinc alloy liquid. When using zinc plate, the tank opening is sealed by stamping; when using metal or alloy liquid, it is sealed by casting.

[0015] 5) Ingredients: Mix pure aluminum ingots, pure zinc ingots, magnesium particles, industrial silicon particles, and rare earth alloy particles according to the required amount for each batch.

[0016] 6) Smelting: Add pure aluminum ingots and pure zinc ingots into the smelting furnace, turn on the power to melt them. After they are basically completely melted, add the granular materials containing these materials into the furnace in the order of silicon, magnesium and rare earth in sequence and melt them evenly. After the furnace temperature rises to the tapping temperature, turn off the power and wait for 1 to 3 minutes, and then remove the slag.

[0017] 7) Casting: The liquid alloy in the furnace is poured into an ingot mold and cooled. The cooled alloy block is then lifted out.

[0018] The smelting furnace is a medium-frequency furnace or an industrial-frequency furnace, and the crucible used is a silicon carbide prefabricated crucible.

[0019] The furnace exit temperature is 700–750℃.

[0020] A method for preparing a hot-dip aluminum-zinc-silicon-magnesium rare earth alloy. The hot-dip aluminum-zinc-silicon-magnesium rare earth alloy has the following chemical composition by weight percentage: Al 53%–57%, Mg 1.3%–5.5%, Si 1.4%–1.8%, RE 0.06%–0.1%, Fe≤0.12%, Pb≤0.08%, Cd≤0.004%, Cu≤0.003%, Sn≤0.003%, with the balance being Zn and other unavoidable impurities.

[0021] This invention employs a density control method. First, aluminum and zinc ingots are mixed and charged into a smelting furnace for melting. Containers of specific dimensions are formed from the aluminum and zinc metals. Then, particles smaller than 10mm, made from Si, Mg, and RE metals, are added to these containers, which are then sealed with zinc plates or by casting liquid zinc. The average density of the containers after being filled with the powder must be no less than the density of the aluminum-zinc mother liquor. During production, these containers containing Si, Mg, RE, and other metal powders are added to the molten pool. Because the density of these containers is no less than that of the mother liquor, they easily sink to any position in the lower part of the molten metal in the furnace. Furthermore, the zinc at the seal of these containers easily melts and detaches, allowing the metal powder to gradually enter the alloy liquid from the containers into the furnace. These small metal particles quickly form a low-melting-point eutectic with the aluminum and zinc, melting into the alloy and achieving uniform distribution under electromagnetic stirring. Because the alloy requires extremely high purity, all raw materials are pure metals and alloys. The main materials include aluminum ingots (Al99.7), zinc ingots (Zn99.995), magnesium ingots (Mg9990), and industrial silicon (Si1101); the rare earth element is lanthanum-cerium alloy (SLMLaCe-4), all of which meet national standards.

[0022] Compared with existing technologies, the beneficial effects of this invention are:

[0023] 1) The hot-dip aluminum-zinc-silicon-magnesium rare earth alloy provided by this invention adds an appropriate amount of metallic magnesium to existing alloys, bringing the total number of main constituent elements to five, further enhancing the complementarity between these elements. The addition of metallic magnesium increases the hardness of the coating, improves surface gloss, enhances surface quality, and refines and homogenizes the microstructure. A suitable Mg content also makes the coating microstructure denser, reduces coating weight, and helps lower costs. Furthermore, magnesium and silicon can form compounds that mitigate the adverse effects of silicon, inhibiting intergranular corrosion and improving corrosion resistance.

[0024] 2) This method effectively controls the flotation of silicon and magnesium and the sinking of rare earth alloys by mechanically regulating parameters such as particle size and density of the materials. Simultaneously, reducing the particle size increases the specific surface area, accelerating the chemical reaction and melting rates. These measures ensure that most of the silicon, magnesium, and rare earths are quickly absorbed by the alloy mother liquor during flotation and sinking. This not only minimizes the oxidation of silicon and magnesium but also avoids the problems caused by lumpy rare earth alloys settling at the bottom of the furnace, resulting in poor thermodynamic and kinetic conditions and prolonged smelting time, thus reducing production difficulty.

[0025] 3) This method uses a one-step production process to prepare the alloy, simplifying the process. It has significant advantages over the direct addition of bulk metals or alloys, the bell jar method, and the intermediate alloy method. Direct addition of bulk metals or alloys results in high losses of metals such as Si, Mg, and RE, and a long smelting time. Using a bell jar can reduce the oxidation of Si and Mg, but the effect is limited, and the melting of the bell jar can contaminate the alloy, causing excessive impurities. The intermediate alloy method not only increases the number of steps, making the process more complex, but also does not reduce the total metal loss or smelting time. This technology can increase magnesium recovery by 3-8% and save more than 10% of smelting time, resulting in high production efficiency and reduced waste of energy, manpower, materials, and resources, thus significantly lowering the overall production cost.

[0026] 4) When the raw material tank containing granular material is initially added to the furnace, its density is greater than that of the aluminum-zinc alloy liquid in the furnace. Therefore, it will sink to the bottom of the furnace or be suspended in the alloy mother liquid. As the tank and the metal inside the tank continue to melt into the alloy, the density will gradually decrease. Under the strong stirring force of the induction furnace, the tank will gradually float to the surface, which will facilitate element absorption.

[0027] 5) This method is easy to operate, and the preparation of raw materials and the production process are greatly simplified. The process does not pollute the alloy and is conducive to the production of high-purity alloys. Detailed Implementation

[0028] The present invention will be described in detail below with reference to the embodiments, but the scope of the present invention is not limited to the following embodiments.

[0029] Example 1:

[0030] A method for producing a hot-dip aluminum-zinc-silicon-magnesium rare earth alloy includes the following specific steps:

[0031] 1) Raw material preparation: Elemental silicon uses national standard industrial silicon, grade: Si1101; rare earth uses national standard lanthanum-cerium alloy, grade: SLMLaCe-4; both are crushed into particles no larger than 10mm. Metallic magnesium uses national standard passivated granular magnesium produced from national standard magnesium ingots, grade: Mg9990; aluminum uses national standard remelted aluminum ingots, grade: Al99.7; zinc uses national standard zinc ingots, grade: Zn99.995.

[0032] 2) Can Making: Using the aluminum ingots from step 1), melt and cast them into can-shaped containers with an outer diameter of Φ100mm × 100mm and an inner cavity of Φ70mm × 85mm. Using zinc ingots, melt and cast them into can-shaped containers with an outer diameter of Φ150mm × 150mm and an inner cavity of Φ120mm × 135mm. Alternatively, aluminum and zinc plates can be used to make cans by stamping or machining from block blanks. This scheme, depending on specific conditions, uses casting to produce several cans.

[0033] 3) Batching: Weigh out 549 kg of aluminum ingots, 258 kg of zinc ingots, 16 kg of industrial silicon granules, 15 kg of magnesium granules, and 1.0 kg of rare earth granules from step 1). Evenly distribute the industrial silicon granules into 9 zinc containers, the magnesium granules into 11 zinc containers, and the rare earth granules into 1 aluminum container. The density of the material at this point is approximately 3.37 g / cm³, forming the initial alloy from the 549 kg aluminum ingots and 258 kg zinc ingots. 3 After sealing, all types of granular containers are prepared according to requirements, with a minimum average density of approximately: Industrial silicon granular containers: 4.0 g / cm³ 3 Magnesium granules container: 3.8g / cm³ 3 Rare earth granular material container: 3.37g / cm³ 3 All requirements are met. The average density of a tank containing granular materials can be adjusted within a certain range by controlling the amount of sealing material and changing the structural dimensions of the tank.

[0034] 4) Smelting: 549 kg of aluminum ingots and 258 kg of zinc ingots were added to an induction furnace with a silicon carbide crucible and melted by electricity. The temperature gradually increased over time, reaching approximately 600–650°C after complete melting. During smelting, the initial molten metal was primarily composed of zinc. A suitable amount of the liquid alloy was scooped from the furnace and poured into various powder containers until completely filled. This ensured a seal at the container openings and increased the total weight and average density of the powder containers. After the aluminum and zinc ingots were fully melted, industrial silicon granules were added. Once completely melted, magnesium and rare earth granules were added. After uniform melting, the temperature was maintained at 700°C, and the power was stopped for 2 minutes to allow for good separation of the alloy from the slag.

[0035] 5) Casting: After removing the slag from the furnace, the molten alloy is poured into a cast iron ingot mold of a certain size. After cooling and solidification, it can be demolded.

[0036] The alloy chemical composition by weight percentage in Example 1 is: Al: 55.1%, Si: 1.49%, Mg: 1.41%, RE: 0.09%, with the balance being Zn and impurities. The weight percentage content of other impurity elements is: Fe: 0.010%, Pb: 0.006%, Cu: 0.001%, Sn: 0.001%.

[0037] Example 2:

[0038] A method for producing a hot-dip aluminum-zinc-silicon-magnesium rare earth alloy includes the following specific steps:

[0039] 1) Raw material preparation: Elemental silicon uses national standard industrial silicon, grade: Si1101; rare earth uses national standard lanthanum-cerium alloy, grade: SLMLaCe-4, both are crushed into particles no larger than 10mm. Metallic magnesium uses national standard passivated granular magnesium produced from national standard magnesium ingots, grade: Mg9990; aluminum uses national standard remelted aluminum ingots, grade: Al99.7; zinc uses national standard zinc ingots, grade: Zn99.95.

[0040] 2) Can Making: Using the aluminum ingots from step 1), melt and cast them into cylindrical containers with an outer diameter of Φ100mm × 100mm and an inner cavity of Φ70mm × 85mm. Using zinc ingots, melt and cast them into cylindrical containers with an outer diameter of Φ150mm × 150mm and an inner cavity of Φ120mm × 135mm. Alternatively, aluminum and zinc plates can be used to make the containers through stamping or cutting. This scheme, depending on specific conditions, uses casting to produce several containers.

[0041] 3) Batching: Weigh out 549 kg of aluminum ingots, 226 kg of zinc ingots, 16 kg of industrial silicon granules, 20 kg of magnesium granules, and 1.0 kg of rare earth granules from step 1). Evenly distribute the industrial silicon granules into 9 zinc containers, the magnesium granules into 15 zinc containers, and the rare earth granules into 1 aluminum container. The density of the material at this point is approximately 3.30 g / cm³, forming the initial alloy density from the 549 kg aluminum ingot and 226 kg zinc ingot. 3 After sealing, the various granular containers are prepared according to requirements, with their minimum average densities being approximately: Industrial silicon granular container: 4.0 g / cm³ 3 Magnesium granules container: 3.8g / cm³ 3 Rare earth granular material container: 3.37g / cm³ 3 The requirements are met. The average density of a tank containing granular materials can be adjusted within a certain range by controlling the amount of sealing material and changing the structural dimensions of the tank.

[0042] 4) Smelting: 549 kg of aluminum ingots and 226 kg of zinc ingots were added to an induction furnace with a silicon carbide crucible and melted by electricity. The temperature gradually increased over time, reaching 630–680°C after near-complete melting. During smelting, the primary molten metal component was zinc. A suitable amount of the liquid alloy was scooped from the furnace and poured into various powder containers until completely filled. This ensured a seal at the container openings and increased the total weight and average density of the powder containers. After the aluminum and zinc ingots were completely melted, industrial silicon powder was added. After complete melting, magnesium granules and rare earth powder were added. The mixture was melted until uniformly melted, and the temperature was maintained at 720°C. The power was then cut off for 3 minutes to allow for good separation of the alloy from the slag.

[0043] 5) Casting: After removing the slag from the furnace, the molten alloy is poured into a cast iron ingot mold of a certain size. After cooling and solidification, it can be demolded.

[0044] The alloy chemical composition by weight percentage in Example 2 is: Al: 54.3%, Si: 1.45%, Mg: 1.91%, RE: 0.081%, with the balance being Zn and impurities. The weight percentage content of other impurity elements is: Fe: 0.009%, Pb: 0.007%, Cu: 0.001%, Sn: 0.002%.

[0045] Example 3:

[0046] A method for producing a hot-dip aluminum-zinc-silicon-magnesium rare earth alloy includes the following specific steps:

[0047] 1) Raw material preparation: Elemental silicon uses national standard industrial silicon, grade: Si1101; rare earth uses national standard lanthanum-cerium alloy, grade: SLMLaCe-4, both are crushed into particles no larger than 10mm. Metallic magnesium uses national standard passivated granular magnesium produced from national standard magnesium ingots, grade: Mg9990; aluminum uses national standard remelted aluminum ingots, grade: Al99.7; zinc uses national standard zinc ingots, grade: Zn99.95.

[0048] 2) Can Making: Using the aluminum ingots from step 1), melt and cast them into cylindrical containers with an outer dimension of Φ100mm×100mm and an inner cavity dimension of Φ70mm×85mm. Using zinc ingots, melt and cast them into cylindrical containers with an outer dimension of Φ150mm×150mm and an inner cavity dimension of Φ120mm×135mm. Alternatively, aluminum and zinc plates can be used to make the containers through stamping or cutting. This scheme, depending on specific conditions, uses casting to produce several containers.

[0049] 3) Batching: Weigh out 549 kg of aluminum ingots, 58 kg of zinc ingots, 16 kg of industrial silicon granules, 50 kg of magnesium granules, and 1.0 kg of rare earth granules from step 1). Evenly distribute the industrial silicon granules into 9 zinc containers, the magnesium granules into 36 zinc containers, and the rare earth granules into 1 aluminum container. The density of the material at this point is approximately 2.87 g / cm³, forming the initial alloy density from the 549 kg aluminum ingot and 58 kg zinc ingot. 3 After sealing, the various granular containers are prepared according to requirements, with their minimum average densities being approximately: Industrial silicon granular container: 4.0 g / cm³ 3 Magnesium granules container: 3.8g / cm³ 3 Rare earth granular material container: 3.37g / cm³ 3 The requirements are met. The average density of a tank containing granular materials can be adjusted within a certain range by controlling the amount of sealing material and changing the structural dimensions of the tank.

[0050] 4) Smelting: 549 kg of aluminum ingots and 58 kg of zinc ingots were added to a medium-frequency furnace using silicon carbide crucibles and melted by electricity. The temperature gradually increased over time, reaching 660–680°C after near-complete melting. During smelting, the initial melted liquid was primarily composed of aluminum-zinc alloy. A suitable amount of the liquid alloy was scooped from the furnace and poured into various powder containers until completely filled. This ensured a seal at the container openings and increased the total weight and average density of the powder containers. After most of the aluminum and zinc ingots had melted, industrial silicon powder was added. Once completely melted, magnesium granules and rare earth powder were added. After uniform melting, the temperature was maintained at 750°C, and the power was stopped for 3 minutes to allow for good separation of the alloy from the slag.

[0051] 5) Casting: After removing the slag from the furnace, the molten alloy is poured into a cast iron ingot mold of a certain size. After cooling and solidification, it can be demolded.

[0052] The alloy chemical composition by weight percentage in Example 3 is: Al: 54.6%, Si: 1.73%, Mg: 4.92%, RE: 0.072%, with the balance being Zn and impurities. The weight percentage content of other impurity elements is: Fe: 0.011%, Pb: 0.005%, Cd: 0.002%, Cu: 0.002%, Sn: 0.001%.

[0053] Sample testing and product usage have demonstrated that adding a certain amount of magnesium to zinc-aluminum alloys or zinc-aluminum-silicon rare earth alloys significantly improves some of the alloy's properties. For example, compared with Chinese patent CN112725670A, alloys with different magnesium contents show a 16%–31% reduction in grain size, a 2.2%–7.5% reduction in density, a 12%–18% increase in hardness, and a 7%–19% reduction in average corrosion rate.

[0054] Therefore, the addition of magnesium to the alloy refines the grain size of the coating, increases its hardness and strength, and improves its wear resistance. The alloy density decreases, resulting in less alloy consumption per unit area for the same coating thickness. The corrosion rate of magnesium-containing alloy coatings decreases, thus enhancing their corrosion resistance. Furthermore, other properties are better than or equivalent to existing magnesium-free alloys.

[0055] The hot-dip aluminum zinc silicon magnesium rare earth alloy manufacturing method and alloy provided by this invention have advantages over existing methods, such as simple process, good product quality, superior performance, and low production cost.

Claims

1. A method for manufacturing a hot-dip aluminum-zinc-silicon-magnesium rare earth alloy, characterized in that, The methods and steps include the following: 1) Preparation of material tanks: Material tanks are made of pure aluminum and pure zinc, namely aluminum tanks and zinc tanks; 2) Granulation: Passivated magnesium particles are used to make silicon particles and rare earth particles. The particle size of silicon particles and rare earth particles is ≤10mm. 3) Packing: Pack the granular material obtained in step 2) above into zinc cans or aluminum cans, wherein the zinc cans are filled with silicon or magnesium granules, and the aluminum cans are filled with rare earth granules. 4) Sealing: Seal the can opening with pure zinc or pure aluminum material; 5) Smelting: Pure aluminum ingots and pure zinc ingots are added to the smelting furnace for melting. After they are completely melted, the tin cans containing these particulate materials are added to the furnace in the order of silicon, magnesium and rare earth to melt evenly. After the furnace temperature rises to the tapping temperature, the power is turned off and waits for 1 to 3 minutes. Then the slag is removed and the casting is carried out.

2. The method for manufacturing a hot-dip aluminum-zinc-silicon-magnesium rare earth alloy according to claim 1, characterized in that, The material tank is manufactured by turning, stamping or casting, and the tank body has 2 to 3 through holes ≤5mm.

3. The method for manufacturing a hot-dip aluminum-zinc-silicon-magnesium rare earth alloy according to claim 1, characterized in that, The rare earth element mentioned is a lanthanum-cerium alloy SLMLaCe-4.

4. The method for manufacturing a hot-dip aluminum-zinc-silicon-magnesium rare earth alloy according to claim 1, characterized in that, In step 4), pure zinc plate is used to seal the can opening by stamping; or liquid zinc liquid or aluminum-zinc alloy liquid is used to seal the can opening by casting.

5. The method for manufacturing a hot-dip aluminum-zinc-silicon-magnesium rare earth alloy according to claim 1, characterized in that, The pure aluminum is not lower than Al99.7 standard, the pure zinc is not lower than Zn99.995 standard, and the silicon is industrial silicon Si1101.

6. The method for manufacturing a hot-dip aluminum-zinc-silicon-magnesium rare earth alloy according to claim 1, characterized in that, The smelting furnace is a medium-frequency furnace or an industrial-frequency furnace.

7. The method for manufacturing a hot-dip aluminum-zinc-silicon-magnesium rare earth alloy according to claim 1, characterized in that, The furnace exit temperature is 700–750℃.

8. A hot-dip aluminized zinc-silicon-magnesium rare earth alloy produced by the method for producing a hot-dip aluminized zinc-silicon-magnesium rare earth alloy as described in any one of claims 1-7, characterized in that, The chemical composition of the alloy, by weight percentage, is as follows: Al 53%–57%, Mg 1.3%–5.5%, Si 1.4%–1.8%, RE 0.06%–0.1%, Fe≤0.12%, Pb≤0.08%, Cd≤0.004%, Cu≤0.003%, Sn≤0.003%, with the balance being Zn and other unavoidable impurities.