A manufacturing process for high-strength rare-earth magnesium alloys

Abstract

This invention relates to the field of materials technology and discloses a manufacturing process for a high-strength rare-earth magnesium alloy. The rare-earth magnesium alloy is made by mixing magnesium powder as the main raw material with aluminum powder, gadolinium powder, bismuth powder, and modified ceramic additives, followed by smelting and solution treatment to form a magnesium alloy matrix. An anti-corrosion coating is then applied to its surface. The modified ceramic additives form a snap-fit ​​tenon-and-mortise structure with the magnesium matrix during the smelting process, greatly enhancing their bonding strength. This effectively utilizes the high strength and tensile strength of the ceramic additives to reinforce the magnesium alloy. Simultaneously, the addition of a very small amount of rare-earth metal gadolinium significantly enhances the mechanical strength of the magnesium alloy. The organic-inorganic composite anti-corrosion coating, after curing, forms a composite coating with high anti-corrosion properties, effectively improving the corrosion resistance of the magnesium alloy.

Description

Technical Field

[0001] This invention relates to the field of materials technology, specifically to a manufacturing process for a high-strength rare-earth magnesium alloy. Background Technology

[0002] Magnesium alloys are high-strength and high-stiffness alloys. Due to their excellent dimensional stability, damping and vibration reduction properties, die-casting performance, hot-formability, and machinability, they are considered "green structural metal materials of the 21st century." In recent years, the lightweight properties of magnesium alloys have made them important materials for industries such as automotive manufacturing and aerospace. At the same time, their high thermal conductivity makes them ideal for fields such as electronics and medical devices—all rapidly developing industries—thus creating tremendous opportunities for the development of magnesium alloys.

[0003] However, magnesium alloys have poor room-temperature mechanical properties, and their strength and other properties cannot meet the application requirements of some industries. Furthermore, magnesium alloys have poor corrosion resistance, which severely limits their application in the marine industry and hinders their further widespread use. Developing high-strength, corrosion-resistant magnesium alloys is of great significance for promoting their further industrialization and application, in order to better meet the requirements of various industries for high-performance magnesium alloys.

[0004] Invention patent application number CN202210887933.1 discloses a high-strength, high-thermal-conductivity rare-earth magnesium alloy, which selects trace amounts of rare-earth element Yb and a small amount of metallic element Zn as the main alloying elements to improve the mechanical properties of magnesium alloy. However, when the amount of rare-earth elements added is large, it will have a significant impact on the cost of magnesium alloy, and at the same time, it will also have a negative effect on the casting performance of magnesium alloy, which is not conducive to the actual production of magnesium alloy.

[0005] Based on this, the present invention provides a magnesium alloy with good mechanical strength and excellent corrosion resistance, which can solve the problems existing in the prior art. Summary of the Invention

[0006] The purpose of this invention is to provide a manufacturing process for high-strength rare earth magnesium alloys, which solves the problems of low strength and poor corrosion resistance of magnesium alloys.

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

[0008] A manufacturing process for a high-strength rare-earth magnesium alloy includes the following steps:

[0009] Step 1: Place magnesium powder, aluminum powder, gadolinium powder, bismuth powder and modified ceramic fiber in a medium-frequency electromagnetic induction furnace, set the melting temperature to 720-730℃, the melting time to 20-40 minutes, and after melting, pour it into a mold at 690-700℃ and let it cool naturally to form a magnesium alloy ingot.

[0010] The second step involves solution treatment of the magnesium alloy ingot at 480-495℃ for 15-20 hours, followed by water quenching after it is taken out of the furnace, and then aging treatment at 170-185℃ for 12-24 hours to form the magnesium alloy body.

[0011] The third step involves uniformly applying an organic-inorganic composite anti-corrosion coating to the surface of the magnesium alloy substrate, controlling the coating amount to be 5-15 g / cm³. 2 After coating, it is cured in a temperature environment of 80-100℃. After it is completely cured, it is removed to form a high-strength rare earth magnesium alloy.

[0012] The modified ceramic fiber is a mullite porous ceramic with magnesium hydroxide deposited on its surface.

[0013] The organic-inorganic composite anti-corrosion coating is a talc-epoxy resin composite coating.

[0014] Furthermore, in the first step, the weight parts of each raw material are as follows: 85-95 parts magnesium powder, 1-2 parts aluminum powder, 0.5-1 part gadolinium powder, 1.5-3.5 parts bismuth powder, and 2-5 parts modified ceramic fiber.

[0015] In the above technical solution, by using a very small amount of the rare earth element gadolinium to make magnesium alloys, on the one hand, the rare earth element gadolinium can form a second phase in the magnesium alloy. These second phases can effectively enhance the mechanical strength of the magnesium alloy. At the same time, the rare earth element gadolinium can also generate lattice distortion in the magnesium matrix and form a distorted stress field, which causes gadolinium atoms to agglomerate near the dislocation lines, generating bound dislocations, which can play a solid solution strengthening effect, thereby effectively enhancing the mechanical strength of the magnesium alloy.

[0016] Furthermore, the modified ceramic fiber is prepared by the following method:

[0017] Step S1: Mix aluminum hydroxide and phosphoric acid solution, heat to 50-60℃, stir and mix evenly to form a transparent solution, add mullite fibers to the transparent solution and mix well, then pour into a mold, place a 200-mesh sieve under the mold, apply pressure from above the mold to make the solution drain from the sieve, forming a ceramic fiber precursor, dry it at 100-120℃ for 12-16 hours, and then sinter it at 1250-1300℃ for 1-3 hours to form fibrous mullite porous ceramic;

[0018] Step S2: Mix mullite porous ceramic fibers with magnesium chloride solution, stir evenly, then add ammonia water. After the addition is complete, stir for 20-30 minutes, then add polyethylene glycol to the mixture. After the addition is complete, place it in a hydrothermal reactor and maintain it at a temperature of 190-210℃ for 4-6 hours. Discharge the material and separate the solid material to form modified ceramic fibers.

[0019] Specifically, aluminum hydroxide and phosphoric acid solution are first mixed to form a metaphosphate binder solution. Then, fibrous mullite porous ceramics are obtained by pressurized drainage. Magnesium chloride is used as the magnesium source, polyethylene glycol is used as the dispersant, and ammonia is used as the precipitant. During the hydrothermal process, magnesium hydroxide crystal nuclei will be released into the pores of the porous ceramic fibers and grow continuously in the pores, thereby forming ceramic fibers with magnesium hydroxide coating on the surface, i.e., modified ceramic fibers.

[0020] Furthermore, in step S1, the mass fraction of the phosphoric acid solution is 10-15%.

[0021] Furthermore, in step S1, the length of the mullite fiber is 1-2 mm.

[0022] Furthermore, in step S2, the concentration of the magnesium chloride solution is 1-2 mol / L.

[0023] By adopting the above technical solution, using ceramic fibers coated with magnesium hydroxide as an additive, magnesium hydroxide is oxidized into magnesium oxide under high temperature conditions during the magnesium alloy manufacturing process. The magnesium oxide adheres to the surface of the ceramic fibers. Since magnesium oxide has good compatibility with the magnesium matrix, it can flow into the pores of the ceramic additive in liquid form during the smelting process, thereby forming a snap-fit ​​tenon-and-mortise connection with the ceramic additive, which greatly strengthens the interfacial interaction between them. By utilizing the high strength and tensile strength of the ceramic fibers, it can be combined with rare earth elements to achieve the effect of effectively enhancing the mechanical strength of the magnesium alloy by adding a small amount of rare earth elements.

[0024] Furthermore, in the third step, the organic-inorganic composite anti-corrosion coating is prepared using the following method:

[0025] Step P1: Disperse talc powder in toluene at a solid-liquid ratio of 1:8-10. Under a nitrogen atmosphere, add 2,2-bis(4-phenyl isocyanate)hexafluoropropane and organotin catalyst to the mixture. After the addition is complete, maintain the temperature at 50-60℃ and stir for 1-3 hours. Then add 2,5-dimethyl-2,5-hexanediol to the mixture, raise the temperature to 60-70℃, and continue stirring for 6-9 hours. Separate the solid material to form modified talc powder.

[0026] Specifically, under the action of organotin catalyst, talc powder can first react with the isocyanate group in the structure of 2,2-bis(4-isocyanate phenyl)hexafluoropropane, thereby modifying the isocyanate group on the surface of talc powder. Then, by adding 2,5-dimethyl-2,5-hexanediol as a chain extender, chain extension is carried out, so that long-chain polymer molecules linked by amine ester bonds are formed on the surface of talc powder, thus obtaining modified talc powder.

[0027] Step P2: Add epoxy resin, modified talc powder, zinc powder, defoamer, leveling agent, dispersant, and curing agent to the mixing tank in sequence, stir at 500-1000 r / min for 30-60 min, discharge the material, let it stand to defoam, and an organic-inorganic composite anti-corrosion coating will be formed.

[0028] Furthermore, in step P1, the organotin catalyst is any one of stannous octoate, dibutyltin diacetate, or dibutyltin dilaurate.

[0029] Furthermore, in step P2, the defoamer is any one of BYK-085, BYK-070, BYK-141, or BYK-065; the leveling agent is any one of BYK-378, BYK-322, BYK-300, or BYK-388; the dispersant is any one of ethyl acetate, acetone, or xylene; and the curing agent is methyltetrahydrophthalic anhydride or hexahydrophthalic anhydride.

[0030] Furthermore, in step P2, the weight parts of each raw material are as follows: 40-55 parts epoxy resin, 3-4.5 parts modified talc powder, 15-20 parts zinc powder, 0.5-1.5 parts defoamer, 0.5-1.5 parts leveling agent, 30-40 parts dispersant, and 25-35 parts curing agent.

[0031] Because the modified talc powder contains a large number of amine ester bonds in its structure, it can interact with the epoxy resin matrix and participate in cross-linking during the coating curing process. It then exists in the epoxy resin coating as a cross-linking core. On the one hand, after the talc powder is dispersed, it forms a physical barrier layer with a lamellar structure, which hinders the penetration of corrosive media. At the same time, the long-chain polymer molecular chains modified on the surface of the talc powder contain a large number of hydrophobic fluorine segments and tertiary carbon segments, which can achieve the hydrophobic effect of the coating, thereby further improving the anti-corrosion effect of the coating and effectively improving the corrosion resistance of magnesium alloy.

[0032] The beneficial effects of this invention are:

[0033] 1) This invention produces modified ceramic fibers, which, after being mixed and smelted with a magnesium matrix, can form a tenon-and-mortise structure with the magnesium matrix, greatly enhancing the bonding between them. This effectively utilizes the high strength and tensile strength of the ceramic additives to strengthen the magnesium alloy. At the same time, the addition of a very small amount of rare earth metal gadolinium greatly enhances the mechanical strength of the magnesium alloy. According to tests, the magnesium alloy produced by this invention can achieve a yield strength of 221 MPa, a tensile strength of 296 MPa, and an elongation of 14.6%.

[0034] 2) This invention forms an anti-corrosion coating by coating the surface of magnesium alloys with an organic-inorganic composite anti-corrosion coating, providing efficient protection for the magnesium alloy substrate and effectively improving its corrosion resistance. Tests show that the magnesium alloy prepared according to this invention exhibits a corrosion rate as low as 0.35 mg·cm⁻¹ in a 3.5% sodium chloride solution corroding environment. -2 ·h -1 It exhibits excellent corrosion resistance.

[0035] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 Scanning electron microscope image of fibrous mullite porous ceramic;

[0038] Figure 2 Thermogravimetric analysis curves of talc powder and modified talc powder are shown. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0040] Example 1

[0041] Preparation of modified ceramic fibers

[0042] Step S1: Mix 2g of aluminum hydroxide with 15mL of 12% phosphoric acid solution, heat to 55℃, stir and mix evenly to form a transparent solution, add 1.5g of mullite fiber with a length of 1mm to the transparent solution and mix well, then pour into a mold, place a 200-mesh sieve under the mold, apply pressure from above the mold to make the solution drain from the sieve, forming a ceramic fiber precursor, dry it at 120℃ for 12h, and then sinter it at 1250℃ for 2h to form fibrous mullite porous ceramic;

[0043] Figure 1 The infrared spectrum of this fibrous mullite porous ceramic shows that its surface exhibits an irregular porous morphology, which can provide a large number of sites for the subsequent attachment of magnesium hydroxide crystal nuclei and enable the magnesium matrix to form a snap-fit ​​tenon structure with it, thereby improving the bonding force between them, thus efficiently utilizing the performance of ceramic fibers and enhancing the mechanical strength of magnesium alloys.

[0044] Step S2: Mix 1.2g of mullite porous ceramic fiber with 25mL of 1.5mol / L magnesium chloride solution, stir evenly, then add 2mL of ammonia water. After the addition is complete, stir for 30min, then add 3.5g of polyethylene glycol to the mixture. After the addition is complete, place it in a hydrothermal reactor and maintain it at 200℃ for 5h. Discharge the material and separate the solid material to form modified ceramic fiber.

[0045] Example 2

[0046] Preparation of organic-inorganic composite anti-corrosion coatings

[0047] Step P1: Disperse 2g of talc powder in 25mL of toluene. Under a nitrogen atmosphere, add 4.5g of 2,2-bis(4-phenyl isocyanate)hexafluoropropane and 0.2g of stannous octoate to the mixture. After the addition is complete, maintain the temperature at 60℃ and stir for 2h. Then add 1.8g of 2,5-dimethyl-2,5-hexanediol to the mixture, raise the temperature to 65℃, and continue stirring for 8h. Separate the solid material to form modified talc powder.

[0048] Figure 2 The thermogravimetric analysis curves of talc powder and modified talc powder are shown. As can be seen from the figure, the modified talc powder exhibits two significant weight loss phenomena at around 200℃ and around 300℃, while the talc powder itself does not exhibit any weight loss phenomenon under high temperature conditions. Therefore, it is speculated that the weight loss phenomenon is caused by the decomposition of organic matter grafted on the surface of talc powder.

[0049] Step P2: Add 45g of E44 epoxy resin, 4g of modified talc powder, 15g of zinc powder, 1.2g of defoamer BYK-085, 1g of leveling agent BYK-378, 35g of dispersant ethyl acetate, and 28g of curing agent hexahydrophthalic anhydride to a mixing tank in sequence. Stir at 1000r / min for 40min, discharge the material, and let it stand to defoam, thus forming an organic-inorganic composite anti-corrosion coating.

[0050] Example 3

[0051] A manufacturing process for a high-strength rare-earth magnesium alloy includes the following steps:

[0052] Step 1: Take 85g of magnesium powder, 1g of aluminum powder, 0.5g of gadolinium powder, 1.5g of bismuth powder and 2g of the modified ceramic fiber prepared in Example 1 of this invention and place them in a medium-frequency electromagnetic induction furnace. Set the melting temperature to 720℃ and the melting time to 20min. After melting, pour the mixture into a mold at 690℃ and let it cool naturally to form a magnesium alloy ingot.

[0053] The second step involves solution treatment of the magnesium alloy ingot at 480℃ for 15 hours, followed by water quenching after it is taken out of the furnace, and then aging treatment at 170℃ for 12 hours to form the magnesium alloy body.

[0054] The third step involves uniformly coating the organic-inorganic composite anti-corrosion coating prepared in Example 2 of this invention onto the surface of the magnesium alloy substrate, controlling the coating amount to be 10 g / cm³. 2 After coating, it is cured at 100℃. Once fully cured, it is removed to form a high-strength rare earth magnesium alloy.

[0055] Example 4

[0056] A manufacturing process for a high-strength rare-earth magnesium alloy includes the following steps:

[0057] Step 1: Take 90g of magnesium powder, 1.5g of aluminum powder, 0.6g of gadolinium powder, 2g of bismuth powder and 4g of the modified ceramic fiber prepared in Example 1 of this invention and place them in a medium frequency electromagnetic induction furnace. Set the melting temperature to 730℃ and the melting time to 30min. After melting, pour the mixture into a mold at 700℃ and let it cool naturally to form a magnesium alloy ingot.

[0058] The second step involves solution treatment of the magnesium alloy ingot at 490℃ for 18 hours, followed by water quenching after it is taken out of the furnace, and then aging treatment at 180℃ for 16 hours to form the magnesium alloy body.

[0059] The third step involves uniformly coating the organic-inorganic composite anti-corrosion coating prepared in Example 2 of this invention onto the surface of the magnesium alloy substrate, controlling the coating amount to be 10 g / cm³. 2After coating, it is cured at 100℃. Once fully cured, it is removed to form a high-strength rare earth magnesium alloy.

[0060] Example 5

[0061] A manufacturing process for a high-strength rare-earth magnesium alloy includes the following steps:

[0062] Step 1: Take 95g of magnesium powder, 2g of aluminum powder, 1g of gadolinium powder, 3.5g of bismuth powder and 5g of the modified ceramic fiber prepared in Example 1 of this invention and place them in a medium-frequency electromagnetic induction furnace. Set the melting temperature to 730℃ and the melting time to 40min. After melting, pour the mixture into a mold at 700℃ and let it cool naturally to form a magnesium alloy ingot.

[0063] The second step involves solution treatment of the magnesium alloy ingot at 495℃ for 20 hours, followed by water quenching after it is taken out of the furnace, and then aging treatment at 185℃ for 24 hours to form the magnesium alloy body.

[0064] The third step involves uniformly coating the organic-inorganic composite anti-corrosion coating prepared in Example 2 of this invention onto the surface of the magnesium alloy substrate, controlling the coating amount to be 10 g / cm³. 2 After coating, it is cured at 100℃. Once fully cured, it is removed to form a high-strength rare earth magnesium alloy.

[0065] Comparative Example 1

[0066] A manufacturing process for rare earth magnesium alloys includes the following steps:

[0067] Step 1: Place 90g magnesium powder, 1.5g aluminum powder, 0.6g gadolinium powder and 2g bismuth powder in a medium-frequency electromagnetic induction furnace, set the melting temperature to 730℃ and the melting time to 30min. After melting, pour the mixture into a mold at 700℃ and let it cool naturally to form a magnesium alloy ingot.

[0068] The second step involves solution treatment of the magnesium alloy ingot at 490℃ for 18 hours, followed by water quenching after it is taken out of the furnace, and then aging treatment at 180℃ for 16 hours to form the magnesium alloy body.

[0069] The third step involves uniformly coating the organic-inorganic composite anti-corrosion coating prepared in Example 2 of this invention onto the surface of the magnesium alloy substrate, controlling the coating amount to be 10 g / cm³. 2 After coating, it is cured at 100°C. Once fully cured, it is removed to form a rare earth magnesium alloy.

[0070] Comparative Example 2

[0071] A manufacturing process for rare earth magnesium alloys includes the following steps:

[0072] Step 1: Take 90g of magnesium powder, 1.5g of aluminum powder, 0.6g of gadolinium powder, 2g of bismuth powder and 4g of the modified ceramic fiber prepared in Example 1 of this invention and place them in a medium frequency electromagnetic induction furnace. Set the melting temperature to 730℃ and the melting time to 30min. After melting, pour the mixture into a mold at 700℃ and let it cool naturally to form a magnesium alloy ingot.

[0073] The second step involves solution treatment of the magnesium alloy ingot at 490℃ for 18 hours, followed by water quenching and aging treatment at 180℃ for 16 hours to form a rare earth magnesium alloy.

[0074] Performance testing

[0075] According to standard GB / T 6397-1986 "Metallic materials - Tensile testing specimens", the mechanical properties of the magnesium alloys prepared in Examples 3-5 and Comparative Examples 1-2 of this invention were tested; the corrosion performance was determined by the corrosion rate, which was tested by a weight loss experiment. The same mass of magnesium alloys prepared in Examples 3-5 and Comparative Examples 1-2 of this invention were placed in a 3.5% sodium chloride solution, and the solution temperature was controlled at 20°C. The test results are shown in the table below.

[0076]

[0077] Analysis shows that, compared with the magnesium alloy prepared without the modified ceramic fiber prepared in Example 1 of this invention, the magnesium alloy prepared with the modified ceramic fiber obviously has better mechanical properties. Similarly, compared with the magnesium alloy not coated with the organic-inorganic composite anti-corrosion coating prepared in Example 2 of this invention, the magnesium alloy coated with the anti-corrosion coating has a significantly lower corrosion rate and stronger corrosion resistance.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] 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 manufacturing process for a high-strength rare-earth magnesium alloy, characterized in that, Includes the following steps: Step 1: Place magnesium powder, aluminum powder, gadolinium powder, bismuth powder and modified ceramic fiber in a medium-frequency electromagnetic induction furnace, set the melting temperature to 720-730℃, the melting time to 20-40 minutes, and after melting, pour it into a mold at 690-700℃ and let it cool naturally to form a magnesium alloy ingot. The second step involves solution treatment of the magnesium alloy ingot at 480-495℃ for 15-20 hours, followed by water quenching after it is taken out of the furnace, and then aging treatment at 170-185℃ for 12-24 hours to form the magnesium alloy body. The third step involves uniformly applying an organic-inorganic composite anti-corrosion coating to the surface of the magnesium alloy substrate, controlling the coating amount to be 5-15 g / cm³. 2 After coating, it is cured in a temperature environment of 80-100℃. After it is completely cured, it is removed to form a high-strength rare earth magnesium alloy. In the first step, the weight parts of each raw material are as follows: 85-95 parts magnesium powder, 1-2 parts aluminum powder, 0.5-1 part gadolinium powder, 1.5-3.5 parts bismuth powder, and 2-5 parts modified ceramic fiber. The modified ceramic fiber is a mullite porous ceramic with magnesium hydroxide deposited on its surface. The modified ceramic fiber is prepared by the following method: Step S1: Mix aluminum hydroxide and phosphoric acid solution, heat to 50-60℃, stir and mix evenly to form a transparent solution, add mullite fibers to the transparent solution and mix well, then pour into a mold, place a 200-mesh sieve under the mold, apply pressure from above the mold to make the solution drain from the sieve, forming a ceramic fiber precursor, dry it at 100-120℃ for 12-16 hours, and then sinter it at 1250-1300℃ for 1-3 hours to form fibrous mullite porous ceramic; Step S2: Mix mullite porous ceramic fibers with magnesium chloride solution, stir evenly, then add ammonia water. After the addition is complete, stir for 20-30 minutes, then add polyethylene glycol to the mixture. After the addition is complete, place it in a hydrothermal reactor and maintain it at a temperature of 190-210℃ for 4-6 hours. Discharge the material and separate the solid material to form modified ceramic fibers. The organic-inorganic composite anti-corrosion coating is a talc-epoxy resin composite coating; The organic-inorganic composite anti-corrosion coating is prepared using the following method: Step P1: Disperse talc powder in toluene at a solid-liquid ratio of 1:8-10. Under a nitrogen atmosphere, add 2,2-bis(4-phenyl isocyanate)hexafluoropropane and organotin catalyst to the mixture. After the addition is complete, maintain the temperature at 50-60℃ and stir for 1-3 hours. Then add 2,5-dimethyl-2,5-hexanediol to the mixture, raise the temperature to 60-70℃, and continue stirring for 6-9 hours. Separate the solid material to form modified talc powder. Step P2: Add epoxy resin, modified talc powder, zinc powder, defoamer, leveling agent, dispersant, and curing agent to the mixing tank in sequence, stir at 500-1000 r / min for 30-60 min, discharge the material, let it stand to defoam, and an organic-inorganic composite anti-corrosion coating will be formed.

2. The manufacturing process of a high-strength rare-earth magnesium alloy according to claim 1, characterized in that, In step S1, the mass fraction of the phosphoric acid solution is 10-15%.

3. The manufacturing process of a high-strength rare-earth magnesium alloy according to claim 1, characterized in that, In step S1, the length of the mullite fiber is 1-2 mm.

4. The manufacturing process of a high-strength rare-earth magnesium alloy according to claim 1, characterized in that, In step S2, the concentration of the magnesium chloride solution is 1-2 mol / L.

5. The manufacturing process of a high-strength rare-earth magnesium alloy according to claim 1, characterized in that, In step P1, the organotin catalyst is any one of stannous octoate, dibutyltin diacetate, or dibutyltin dilaurate.

6. The manufacturing process of a high-strength rare-earth magnesium alloy according to claim 1, characterized in that, In step P2, the defoamer is any one of BYK-085, BYK-070, BYK-141, or BYK-065; the leveling agent is any one of BYK-378, BYK-322, BYK-300, or BYK-388; the dispersant is any one of ethyl acetate, acetone, or xylene; and the curing agent is methyltetrahydrophthalic anhydride or hexahydrophthalic anhydride.

7. The manufacturing process of a high-strength rare-earth magnesium alloy according to claim 1, characterized in that, In step P2, the weight parts of each raw material are as follows: 40-55 parts epoxy resin, 3-4.5 parts modified talc powder, 15-20 parts zinc powder, 0.5-1.5 parts defoamer, 0.5-1.5 parts leveling agent, 30-40 parts dispersant, and 25-35 parts curing agent.

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