Preparation process of new energy vehicle aluminum alloy anti-collision beam

Abstract

The application discloses a preparation process of an aluminum alloy anti-collision beam of a new energy vehicle and belongs to the technical field of aluminum alloys. The preparation process comprises the following steps: S1, raw materials are prepared according to mass percentages; S2, an aluminum ingot is heated and melted, then magnesium ingots, zinc ingots and intermediate alloys are added, and the mixture is stirred and melted to obtain an aluminum alloy liquid; S3, the temperature is raised to 800-810 DEG C, SiC is added into the aluminum alloy liquid, and the mixture is stirred; S4, after the raw materials are completely melted, a refining agent is added, argon is introduced to refine the aluminum alloy liquid, and slag is removed and the mixture is left to stand; and S5, casting, extrusion molding, artificial aging treatment, anticorrosive paint spraying on the surface and solidification are carried out. The raw material of the rare earth fluoride as the refining agent has a good purifying effect, the rare earth fluoride is prepared by doping metal lanthanum and cerium in the application, the rare earth fluoride has a good degassing and impurity removing effect, the gas content in the melt is reduced, the pinhole degree of the alloy surface is reduced, and then the tensile strength of the alloy is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aluminum alloy, and particularly relates to a preparation process of an aluminum alloy anti-collision beam for a new energy vehicle. BACKGROUND

[0002] The anti-collision beam is a device used for reducing damage of a vehicle in a collision, which is composed of a main beam, an energy absorption box and a mounting plate connected to the vehicle. In a collision process, the anti-collision beam will change a lot in shape, and the vehicle body, engine and even passengers will be seriously injured. Therefore, the main beam of the anti-collision beam should meet certain strength, rigidity and toughness, and should also have certain plasticity, so that the vehicle has buffering capacity when being impacted, and plays a good protection role on people and vehicles.

[0003] At present, the aluminum alloy extrusion material used for the anti-collision beam of the vehicle can adopt 7000 series aluminum alloy. The 7000 series (Al-Zn-Mg series) aluminum alloy is also called super-hard aluminum, and belongs to high-strength aluminum alloy. Although the 7000 series aluminum alloy has the advantage of high strength, when being used for safety structural parts such as the bumper and the door anti-collision beam of the vehicle, the problem of insufficient fracture toughness and high corrosion sensitivity generally exists, and the main reason is that high alloying leads to a large constraint relationship between strength and toughness, and high-density precipitated strengthening phases are easy to gather at the grain boundary to cause stress corrosion and grain boundary corrosion. SUMMARY

[0004] The application aims to provide a preparation process of an aluminum alloy anti-collision beam for a new energy vehicle, so as to solve the problem of insufficient strength of the aluminum alloy anti-collision beam.

[0005] The purpose of the application can be achieved by the following technical scheme.

[0006] A preparation process of an aluminum alloy anti-collision beam for a new energy vehicle, comprising the following steps:

[0007] S1, preparing raw materials according to the following mass percentages: Zn 6.2-6.6%, Mg 1.0-1.5%, Cu 0.2-0.6%, Li 0.2-0.3% and SiC 3-5%, and the balance being Al and unavoidable impurities; wherein, aluminum, zinc and magnesium are aluminum ingots, zinc ingots and magnesium ingots; the intermediate alloy is an Al-20Cu alloy and an Al-10Li alloy;

[0008] S2, heating the aluminum ingot to 760-780 DEG C to melt, then adding the magnesium ingot, the zinc ingot and the intermediate alloy, and stirring to melt, so as to obtain an aluminum alloy liquid;

[0009] S3, heating to 800-810 DEG C, and adding SiC into the aluminum alloy liquid and fully stirring;

[0010] S4, after the raw materials are completely melted, adding a refining agent, and then introducing argon to refine the aluminum alloy liquid, and then removing slag and standing.

[0011] S5, casting, extrusion molding, artificial aging treatment, after molding, spraying anticorrosive paint on the surface, curing in the oven at 85-90 DEG C for 30-60 min to obtain a new energy vehicle aluminum alloy crash beam. Artificial aging treatment: heating to 100-120 DEG C for 3-4 h, and then heating to 150-180 DEG C for 14-16 h.

[0012] Further, the refining agent comprises the following raw materials by weight: 10 parts of chloride, 1-1.5 parts of cryolite, 1.5-2 parts of hexachloroethane and 1-1.1 parts of rare earth fluoride.

[0013] Further, the chloride is sodium chloride and potassium chloride mixed in a mass ratio of 1:1.

[0014] Further, the rare earth fluoride is prepared by the following steps:

[0015] Under the condition of nitrogen protection, sodium fluoride and deionized water are mixed to obtain a sodium fluoride solution, then lanthanum chloride heptahydrate and cerium chloride heptahydrate are added to the deionized water and stirred and mixed, then the sodium fluoride solution is added dropwise, the temperature is set to 75 DEG C, the stirring reaction is carried out for 5 h, the temperature is cooled to room temperature, ethanol is added and stirred and dispersed, then it is left to stand for 16 h, centrifugal separation and drying are carried out to obtain the rare earth fluoride.

[0016] Further, the amount ratio of sodium fluoride to deionized water in the sodium fluoride solution is 1g:180mL; the amount ratio of lanthanum chloride heptahydrate, cerium chloride heptahydrate, deionized water and sodium fluoride solution is 1.2g:2.5g:20mL:100mL.

[0017] Further, the adding amount of the refining agent is 2-3 kg of refining agent per ton of aluminum alloy liquid.

[0018] Further, the refining time is 20-30 min, and the standing time is 30-60 min.

[0019] Further, the anticorrosive paint is prepared by the following steps:

[0020] The silica suspension and the organic fluorine-containing acrylic resin are mixed, and stirred and dispersed for 30 min to obtain the anticorrosive coating, and the mass ratio of the silica suspension and the organic fluorine-containing acrylic resin is 1:1. The organic fluorine-containing acrylic resin has good weather resistance and corrosion resistance, the C-F bond in the structure has the characteristics of low surface energy, etc., in the application, the silica suspension is added in the anticorrosive coating to improve the surface roughness after curing of the coating and improve the hydrophobic property of the surface. In order to further improve the hydrophobic property of the anticorrosive coating, the nano-silica is treated with fluorine-containing siloxane before being mixed with the organic fluorine-containing acrylic resin. After the nano-silica is treated with the fluorine-containing siloxane, the nano-silica is combined with the fluorine-containing siloxane through a chemical bond, on the one hand, the mixing effect of the nano-silica and the organic fluorine-containing acrylic resin is better, and on the other hand, the treated nano-silica is dispersed between the coating layers formed by the coating, so that it is more difficult for water or corrosive medium to penetrate into the inside, and the aluminum alloy material is better protected.

[0021] Further, the silica suspension is prepared by the following steps:

[0022] The nano-silica, the 80% ethanol aqueous solution by volume fraction and the fluorine-containing siloxane are mixed, then stirred and reacted at 70 DEG C for 3 h, after centrifugal separation, the nano-silica, the 80% ethanol aqueous solution by volume fraction and the fluorine-containing siloxane are mixed, stirred and dispersed with ethyl acetate to obtain the silica suspension. The mass ratio of the nano-silica, the 80% ethanol aqueous solution by volume fraction and the fluorine-containing siloxane is 4 g:100 mL:2 g.

[0023] Further, the fluorine-containing siloxane is one of tridecafluorooctyltriethoxysilane and tridecafluorooctyltrimethoxysilane.

[0024] Further, the organic fluorine-containing acrylic resin is prepared by the following steps:

[0025] The methyl methacrylate, the methyl methacrylate dodecafluoroheptyl ester, the isopropyl alcohol and the azobisisobutyronitrile are mixed to obtain a mixed solution A; the butyl acrylate, the methyl methacrylate dodecafluoroheptyl ester, the isopropyl alcohol and the azobisisobutyronitrile are mixed to obtain a mixed solution B; under the condition of nitrogen protection, the mixed solution B is added dropwise into the mixed solution A, the temperature is set to 90 DEG C, and stirred and reacted for 3 h, after the reaction is completed, rotary evaporation is carried out at 40 DEG C under reduced pressure until the volume is unchanged to obtain the organic fluorine-containing acrylic resin. The dosage ratio of the methyl methacrylate, the methyl methacrylate dodecafluoroheptyl ester, the isopropyl alcohol and the azobisisobutyronitrile in the mixed solution A is 3 mL:3 mL:20 mL:0.1 g; the dosage ratio of the butyl acrylate, the methyl methacrylate dodecafluoroheptyl ester, the isopropyl alcohol and the azobisisobutyronitrile in the mixed solution B is 7 mL:3 mL:20 mL:0.1 g.

[0026] The beneficial effects of the application are as follows:

[0027] The present application provides a new energy vehicle aluminum alloy crash beam preparation process, and a refining agent is prepared in the preparation process, rare earth fluoride is used as the raw material of the refining agent, and the refining agent has good purification effect, in the present application, a rare earth fluoride is prepared by doping metal lanthanum and cerium, the rare earth fluoride has good degassing and impurity removal effect, reduces the gas (hydrogen) content in the melt, reduces the pinhole degree of the alloy surface, and further improves the tensile strength of the alloy; and can promote grain refinement, so that the strength, hardness, welding performance, corrosion resistance and the like are greatly improved. Compared with the conventional rare earth fluoride, in the present application, metal lanthanum and cerium are introduced for doping, the dendrite spacing in the aluminum and aluminum alloy is reduced, and the best mechanical properties can be obtained.

[0028] The raw material of the aluminum alloy crash beam is aluminum alloy, the aluminum alloy surface has an Al2O3 film, which is easy to adsorb moisture, and the aluminum and aluminum alloy parts are easy to be pitted in the humid atmosphere, and are easy to be corroded in the use process, which affects the performance and appearance, in the present application, spraying a dense anti-corrosion coating on the aluminum alloy substrate can effectively increase the anti-corrosion ability of the aluminum alloy, in order to further improve the anti-corrosion effect of the anti-corrosion coating, in the present application, the treated nano silicon dioxide is added in the coating, which can not only improve the wear resistance of the coating after curing, but also improve the corrosion resistance. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0030] Embodiment 1

[0031] The present embodiment provides an anti-corrosion coating prepared by the following steps:

[0032] 4g of nano silicon dioxide, 100mL of 80% ethanol aqueous solution, 2g of fluorine-containing siloxane, 70℃ stirring reaction for 3h, centrifugal separation, mixing with 20mL of ethyl acetate, stirring and dispersing to obtain a silicon dioxide suspension; the fluorine-containing siloxane is tridecafluorooctyltriethoxysilane;

[0033] Mixture A was prepared by mixing 3 mL of methyl methacrylate, 3 mL of dodecafluoroheptyl methacrylate, 20 mL of isopropanol, and 0.1 g of azobisisobutyronitrile. Mixture B was prepared by mixing 7 mL of butyl acrylate, 3 mL of dodecafluoroheptyl methacrylate, 20 mL of isopropanol, and 0.1 g of azobisisobutyronitrile. Under nitrogen protection, mixture B was added dropwise to mixture A. The temperature was set at 90 °C, and the mixture was stirred for 3 h. After the reaction was completed, the mixture was rotary evaporated under reduced pressure at 40 °C until no change in volume was observed, thus obtaining the organofluoroacrylic resin.

[0034] A silica suspension and an organofluorine acrylic resin were mixed and stirred for 30 minutes to obtain an anti-corrosion coating. The mass ratio of the silica suspension to the organofluorine acrylic resin was 1:1.

[0035] Example 2

[0036] This embodiment provides an anti-corrosion coating prepared through the following steps:

[0037] 4g of nano-silica was mixed with 100mL of 80% ethanol aqueous solution, and then 2g of fluorinated siloxane was added. The mixture was stirred at 70℃ for 3h. After centrifugation, it was mixed with 20mL of ethyl acetate and stirred to disperse, thus obtaining a silica suspension. The fluorinated siloxane was tridecafluorooctyltrimethoxysilane.

[0038] Mixture A was prepared by mixing 3 mL of methyl methacrylate, 3 mL of dodecafluoroheptyl methacrylate, 20 mL of isopropanol, and 0.1 g of azobisisobutyronitrile. Mixture B was prepared by mixing 7 mL of butyl acrylate, 3 mL of dodecafluoroheptyl methacrylate, 20 mL of isopropanol, and 0.1 g of azobisisobutyronitrile. Under nitrogen protection, mixture B was added dropwise to mixture A. The temperature was set at 90 °C, and the mixture was stirred for 3 h. After the reaction was completed, the mixture was rotary evaporated under reduced pressure at 40 °C until no change in volume was observed, thus obtaining the organofluoroacrylic resin.

[0039] A silica suspension and an organofluorine acrylic resin were mixed and stirred for 30 minutes to obtain an anti-corrosion coating. The mass ratio of the silica suspension to the organofluorine acrylic resin was 1:1.

[0040] Comparative Example 1

[0041] Compared with Example 1, the anti-corrosion coating in this comparative example is an organic fluoroacrylic resin, while the other raw materials and preparation process remain the same as in Example 1.

[0042] Example 3

[0043] A manufacturing process for an aluminum alloy anti-collision beam for new energy vehicles includes the following steps:

[0044] S1. Prepare materials according to the following mass percentages: Zn 6.2%, Mg 1.0%, Cu 0.2%, Li 0.2% and SiC 3%, with the balance being Al and unavoidable impurities; wherein aluminum, zinc and magnesium are produced using aluminum ingots, zinc ingots and magnesium ingots; the intermediate alloys are Al-20Cu alloy and Al-10Li alloy.

[0045] S2. Heat the aluminum ingot to 760℃ to melt it, then add magnesium ingot, zinc ingot and intermediate alloy, stir and melt to obtain aluminum alloy liquid;

[0046] S3. Heat to 800℃, add SiC to the aluminum alloy liquid, and stir for 10 minutes;

[0047] S4. After all raw materials have melted, a refining agent is added, and then argon gas is introduced to refine the aluminum alloy liquid. Slag is removed, and the mixture is allowed to stand. The amount of refining agent added is 2 kg per ton of aluminum alloy liquid. The refining time is 30 minutes, and the standing time is 30 minutes. The refining agent comprises the following raw materials by weight: 10 parts chloride, 1 part cryolite, 1.5 parts hexachloroethane, and 1 part rare earth fluoride. The chloride is a mixture of sodium chloride and potassium chloride in a 1:1 mass ratio. The rare earth fluoride is prepared through the following steps:

[0048] Under nitrogen protection, sodium fluoride and deionized water were mixed to obtain a sodium fluoride solution. Lanthanum chloride heptahydrate and cerium chloride heptahydrate were then added to the deionized water and stirred until mixed. This mixture was then added dropwise to the sodium fluoride solution. The temperature was set at 75°C, and the reaction was stirred for 5 hours. After cooling to room temperature, ethanol was added and stirred to disperse the mixture. The mixture was then allowed to stand for 16 hours, centrifuged, and dried to obtain rare earth fluorides. The ratio of sodium fluoride to deionized water in the sodium fluoride solution was 1 g:180 mL; the ratio of lanthanum chloride heptahydrate, cerium chloride heptahydrate, deionized water, and sodium fluoride solution was 1.2 g:2.5 g:20 mL:100 mL.

[0049] S5, casting, extrusion molding, artificial aging treatment.

[0050] Example 4

[0051] A manufacturing process for an aluminum alloy anti-collision beam for new energy vehicles includes the following steps:

[0052] S1. Prepare materials according to the following mass percentages: Zn 6.5%, Mg 1.2%, Cu 0.4%, Li 0.2% and SiC 5%, with the balance being Al and unavoidable impurities; among which, aluminum, zinc and magnesium are made from aluminum ingots, zinc ingots and magnesium ingots; the intermediate alloys are Al-20Cu alloy and Al-10Li alloy.

[0053] S2. Heat the aluminum ingot to 780℃ to melt it, then add magnesium ingot, zinc ingot and intermediate alloy, stir and melt to obtain aluminum alloy liquid;

[0054] S3. Heat to 810℃, add SiC to the aluminum alloy liquid, and stir for 15 minutes;

[0055] S4. After all raw materials have melted, a refining agent is added, and then argon gas is introduced to refine the aluminum alloy liquid. Slag is removed, and the mixture is allowed to stand. The amount of refining agent added is 3 kg per ton of aluminum alloy liquid. The refining time is 30 minutes, and the standing time is 50 minutes. The refining agent comprises the following raw materials by weight: 10 parts chloride, 1.5 parts cryolite, 1.5 parts hexachloroethane, and 1.1 parts rare earth fluoride. The chloride is a mixture of sodium chloride and potassium chloride in a 1:1 mass ratio. The rare earth fluoride is prepared through the following steps:

[0056] Under nitrogen protection, sodium fluoride and deionized water were mixed to obtain a sodium fluoride solution. Lanthanum chloride heptahydrate and cerium chloride heptahydrate were then added to the deionized water and stirred until mixed. This mixture was then added dropwise to the sodium fluoride solution. The temperature was set at 75°C, and the reaction was stirred for 5 hours. After cooling to room temperature, ethanol was added and stirred to disperse the mixture. The mixture was then allowed to stand for 16 hours, centrifuged, and dried to obtain rare earth fluorides. The ratio of sodium fluoride to deionized water in the sodium fluoride solution was 1 g:180 mL; the ratio of lanthanum chloride heptahydrate, cerium chloride heptahydrate, deionized water, and sodium fluoride solution was 1.2 g:2.5 g:20 mL:100 mL.

[0057] S5. Casting, extrusion molding, artificial aging treatment, and after molding, the anti-corrosion coating prepared in Example 1 is sprayed on the surface and cured in a 90℃ oven for 50 minutes to obtain an aluminum alloy anti-collision beam for new energy vehicles. The coating thickness formed after curing is 80-90μm.

[0058] Example 5

[0059] A manufacturing process for an aluminum alloy anti-collision beam for new energy vehicles includes the following steps:

[0060] S1. Prepare materials according to the following mass percentages: Zn 6.6%, Mg 1.5%, Cu 0.6%, Li 0.3% and SiC 5%, with the balance being Al and unavoidable impurities; among which, aluminum, zinc and magnesium are made from aluminum ingots, zinc ingots and magnesium ingots; the intermediate alloys are Al-20Cu alloy and Al-10Li alloy.

[0061] S2. Heat the aluminum ingot to 780℃ to melt it, then add magnesium ingot, zinc ingot and intermediate alloy, stir and melt to obtain aluminum alloy liquid;

[0062] S3. Heat to 810℃, add SiC to the aluminum alloy liquid, and stir for 15 minutes;

[0063] S4. After all raw materials have melted, a refining agent is added, and then argon gas is introduced to refine the aluminum alloy liquid. Slag is removed, and the mixture is allowed to stand. The amount of refining agent added is 3 kg per ton of aluminum alloy liquid. The refining time is 20 minutes, and the standing time is 60 minutes. The refining agent comprises the following raw materials by weight: 10 parts chloride, 1.5 parts cryolite, 2 parts hexachloroethane, and 1.1 parts rare earth fluoride. The chloride is a mixture of sodium chloride and potassium chloride in a 1:1 mass ratio. The rare earth fluoride is prepared through the following steps:

[0064] Under nitrogen protection, sodium fluoride and deionized water were mixed to obtain a sodium fluoride solution. Lanthanum chloride heptahydrate and cerium chloride heptahydrate were then added to the deionized water and stirred until mixed. This mixture was then added dropwise to the sodium fluoride solution. The temperature was set at 75°C, and the reaction was stirred for 5 hours. After cooling to room temperature, ethanol was added and stirred to disperse the mixture. The mixture was then allowed to stand for 16 hours, centrifuged, and dried to obtain rare earth fluorides. The ratio of sodium fluoride to deionized water in the sodium fluoride solution was 1 g:180 mL; the ratio of lanthanum chloride heptahydrate, cerium chloride heptahydrate, deionized water, and sodium fluoride solution was 1.2 g:2.5 g:20 mL:100 mL.

[0065] S5. Casting, extrusion molding, artificial aging treatment, and after molding, the anti-corrosion coating prepared in Example 2 is sprayed on the surface and cured in a 90℃ oven for 30 minutes to obtain an aluminum alloy anti-collision beam for new energy vehicles. The coating thickness formed after curing is 80-90μm.

[0066] Comparative Example 2

[0067] Compared with Example 3, this comparative example does not contain rare earth fluorides, but the other raw materials and preparation process are the same as in Example 3.

[0068] Comparative Example 3

[0069] Compared with Example 3, in this comparative example, lanthanum chloride heptahydrate was replaced with cerium chloride heptahydrate in the preparation process of rare earth fluorides, while the other raw materials and preparation process remained the same as in Example 3.

[0070] Performance tests were conducted on Example 3 and Comparative Examples 2-3. Mechanical properties were tested according to GB / T228.1-2010 "Metallic materials, tensile testing—Part 1: Tests at room temperature." The pinhole grade of the specimens was evaluated according to national standard GB / T7946.31999. The results are shown in Table 1.

[0071] Table 1

[0072]

[0073] The test results show that the material prepared by this invention has good mechanical properties. In this invention, by adjusting the composition of the refining agent, the degassing efficiency is improved and the pinhole level is reduced, thereby improving the mechanical properties of the material.

[0074] Comparative Example 4

[0075] Compared with Example 5, the anti-corrosion coating in this comparative example was replaced with the sample prepared in Comparative Example 1, while the other raw materials and preparation process remained the same as in Example 5.

[0076] Examples 4-5 and Comparative Example 4 were tested using the linear abrasion test with sandpaper. A 100g weight was added to 2000-grit sandpaper, and the sandpaper was moved at a constant speed of 40mm across the coating for one cycle. After 12 cycles, the water contact angle of the coating was measured. Salt spray testing was performed according to GB / T1771-2007, and the percentage of rusted area was recorded at 60, 90, and 120 days. The results are shown in Table 2.

[0077] Table 2

[0078]

[0079] The test results show that the coating prepared by this invention contains treated nano-silica, which improves the anti-corrosion effect of the anti-corrosion coating and provides better protection for the anti-collision beam.

[0080] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0081] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A manufacturing process for an aluminum alloy anti-collision beam for new energy vehicles, characterized in that, Includes the following steps: S1, aluminum, zinc and magnesium are produced using aluminum ingots, zinc ingots and magnesium ingots; the master alloys are Al-20Cu alloy and Al-10Li alloy; the materials are prepared according to the following mass percentages: Zn 6.2-6.6%, Mg 1.0-1.5%, Cu 0.2-0.6%, Li 0.2-0.3% and SiC 3-5%, with the balance being Al and unavoidable impurities; S2. Heat the aluminum ingot to 760-780℃ to melt it, then add magnesium ingot, zinc ingot and intermediate alloy, stir and melt to obtain aluminum alloy liquid; S3. Heat to 800-810℃, add SiC to the aluminum alloy liquid, and stir thoroughly; S4. After all the raw materials have melted, add refining agent, then introduce argon gas to refine the aluminum alloy liquid, remove slag, and let it stand. The refining agent comprises the following raw materials in parts by weight: 10 parts chloride, 1-1.5 parts cryolite, 1.5-2 parts hexachloroethane, and 1-1.1 parts rare earth fluoride; the rare earth fluoride is prepared by the following steps: Under nitrogen protection, sodium fluoride and deionized water were mixed to obtain a sodium fluoride solution. Then, lanthanum chloride heptahydrate and cerium chloride heptahydrate were added to the deionized water and stirred. The mixture was then added dropwise to the sodium fluoride solution. The temperature was set at 75℃, and the reaction was stirred for 5 hours. After cooling to room temperature, ethanol was added and stirred to disperse the mixture. The mixture was then allowed to stand for 16 hours, centrifuged, and dried to obtain rare earth fluorides. The ratio of sodium fluoride to deionized water in the sodium fluoride solution was 1 g: 180 mL. The ratio of lanthanum chloride heptahydrate, cerium chloride heptahydrate, deionized water, and sodium fluoride solution was 1.2 g: 2.5 g: 20 mL: 100 mL. S5. Casting, extrusion molding, artificial aging treatment, surface coating with anti-corrosion paint, and curing yield an aluminum alloy anti-collision beam for new energy vehicles; the anti-corrosion paint is prepared through the following steps: A silica suspension and an organofluoroacrylic resin were mixed and stirred for 30 minutes to obtain an anti-corrosion coating. The mass ratio of the silica suspension to the organofluoroacrylic resin was 1:

1. The silica suspension is prepared by the following steps: Nano-silica and 80% (v / v) aqueous ethanol solution were mixed, and then fluorosiloxane was added. The mixture was stirred at 70°C for 3 hours. After centrifugation, it was mixed with ethyl acetate and stirred to disperse, thus obtaining a silica suspension.

2. The manufacturing process of an aluminum alloy anti-collision beam for new energy vehicles according to claim 1, characterized in that, The chloride is a mixture of sodium chloride and potassium chloride in a mass ratio of 1:

1.

3. The manufacturing process of an aluminum alloy anti-collision beam for new energy vehicles according to claim 1, characterized in that, The amount of refining agent added is 2-3 kg per ton of aluminum alloy liquid.

4. The manufacturing process of an aluminum alloy anti-collision beam for new energy vehicles according to claim 1, characterized in that, The refining time is 20-30 minutes, and the settling time is 30-60 minutes.

5. The manufacturing process of an aluminum alloy anti-collision beam for new energy vehicles according to claim 1, characterized in that, The fluorinated siloxane is one of tridecafluorooctyltriethoxysilane and tridecafluorooctyltrimethoxysilane.

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