A crack-resistant aluminum alloy material for door sill beams in new energy vehicles

Abstract

This invention relates to the field of alloy materials technology and discloses a crack-resistant aluminum alloy material for door sill beams in new energy vehicles. The aluminum alloy material prepared by this invention comprises the following raw materials in total: Cu: 0.1wt%-0.3wt%, Ti: 0.05wt%-0.15wt%, Mg: 0.8wt%-1.5wt%, Mo: 0.02wt%-0.07wt%, V: 0.01wt%-0.04wt%, Co: 0.01wt%-0.03wt%, with the balance being Al and unavoidable impurities. It uses aluminum alloy as the base material and adds functional metal elements such as Ti, Mo, V, and Co, which work synergistically to improve the crack resistance of the matrix. Simultaneously, a refining agent is added to the molten aluminum alloy, utilizing its excellent adsorption properties to adsorb hydrogen and impurities within the molten aluminum alloy, improving the purity of the molten aluminum alloy and thus enhancing the overall performance of the aluminum alloy material.

Description

Technical Field

[0001] This invention relates to the field of alloy materials technology, specifically to a crack-resistant aluminum alloy material for door sill beams in new energy vehicles. Background Technology

[0002] The rapid development of new energy vehicles has improved vehicle performance, energy conservation, emission reduction, safety, and environmental friendliness. The materials used in manufacturing new energy vehicles have become increasingly diversified, with common automotive materials including aluminum alloys and carbon fiber. To improve energy efficiency and driving range, new energy vehicles have an urgent need for lightweighting, and aluminum alloys, due to their low density, high strength, and good corrosion resistance, have become an ideal material for achieving vehicle lightweighting. In new energy vehicles, the door sill beams primarily serve as an important support point on the side of the vehicle body, effectively dispersing impact forces during side collisions, reducing injury to passengers, helping to maintain the overall rigidity of the vehicle body, and improving vehicle handling stability.

[0003] Aluminum alloys possess excellent crack resistance, making them suitable for use as door sill beams, enabling lightweighting of automobiles and enhancing safety. However, during aluminum alloy production, impurities such as oxide films, oxide inclusions, and hydrogen gas are present in the molten aluminum. These impurities can lead to defects in subsequent castings, including deformation, voids, and discontinuous surface films. These defects make the aluminum alloy more susceptible to corrosion, compromising its performance and reducing its crack resistance and corrosion resistance. Therefore, it is essential to remove impurities from the molten aluminum during production to improve purity and ultimately enhance the overall performance of the aluminum alloy products. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a crack-resistant aluminum alloy material for door sill beams in new energy vehicles.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A crack-resistant aluminum alloy material for door sill beams in new energy vehicles, comprising the following raw materials in total quantity:

[0007] Cu: 0.1wt%-0.3wt%, Ti: 0.05wt%-0.15wt%, Mg: 0.8wt%-1.5wt%, Mo: 0.02wt%-0.07wt%, V: 0.01wt%-0.04wt%, Co: 0.01wt%-0.03wt%, with the balance being Al and unavoidable impurities;

[0008] Furthermore, the crack-resistant aluminum alloy material for the door sill beam of this new energy vehicle is prepared using the following steps:

[0009] Step S1: Prepare the amount of each component raw material according to the ratio, then place each raw material in deionized water and sonicate for 30 minutes. Then put the treated raw materials into the melting furnace and melt them at 700-750℃ until the raw materials are completely melted to obtain aluminum alloy liquid.

[0010] Step S2: Add refining agent to the above aluminum alloy liquid, stir electromagnetically for 5-10 minutes, and then heat-treat for 10-20 minutes to obtain refined aluminum alloy liquid.

[0011] Furthermore, in step S2, the amount of refining agent used is 1.5wt%-3.0wt% of the molten aluminum alloy;

[0012] Step S3: The refined aluminum alloy liquid is continuously cast through a hydraulic casting machine and a casting pan to obtain aluminum rods. The rods are then homogenized twice, cooled, and the resulting aluminum alloy rods are sawn into 1m short rods to obtain aluminum alloy materials.

[0013] Furthermore, in step S3, the conditions for the first homogenization treatment are: heating to 460-500℃ at a heating rate of 70℃ / h, and holding for 12h; the conditions for the second homogenization treatment are: temperature of 560-580℃, and holding for 10-16h.

[0014] Furthermore, the refining agent is prepared by the following steps:

[0015] Step A1: Mix and grind talc powder and ammonium sulfate. Place the ground product in a quartz crucible and heat-treat it at 1300-1400℃ under nitrogen for 2.5-3.5 hours. Allow it to cool naturally to room temperature to obtain porous talc powder.

[0016] Furthermore, in step A1, the mass ratio of talc to ammonium sulfate is 1-3:0.01-0.05;

[0017] Step A2: Disperse chromium nitrate nonahydrate and terephthalic acid in 0.05 mol / L sodium acetate aqueous solution and sonicate for 30 min. Then add porous talc powder and stir for 10-30 min. Transfer to an autoclave and hydrothermally react at 180-200℃ for 12 h. Centrifuge, wash and dry to obtain talc powder / MIL-101 composite material.

[0018] Furthermore, in step A2, the ratio of chromium nitrate nonahydrate, terephthalic acid, sodium acetate aqueous solution, and porous talc is 3-4 g: 1.4-1.7 g: 50 mL: 0.045-0.15 g;

[0019] Step A3: Add the talc / MIL-101 composite material to ethanol and mix for 10 min. Under nitrogen conditions, add nano tantalum powder and sonicate for 30 min. Then, distill under reduced pressure to obtain the refining agent.

[0020] Furthermore, in step A3, the mass ratio of talc / MIL-101 composite material, ethanol, and nano tantalum powder is 1-5:50:0.1-1.

[0021] The beneficial effects of this invention are:

[0022] The new energy vehicle door sill beam prepared by this invention uses aluminum alloy as the base material and adds functional metal elements, such as Ti, Mo, V and Co, which work synergistically to improve the crack resistance of the aluminum alloy material. At the same time, a refining agent is added to the aluminum alloy liquid, which uses its excellent adsorption properties to adsorb hydrogen and impurities inside the aluminum alloy liquid, improves the purity of the aluminum alloy liquid, and thus improves the comprehensive performance of the aluminum alloy material.

[0023] The refining agent is based on talc powder, which is blended with ammonium sulfate, then ground and treated at high temperature to obtain porous talc powder. MIL-101 is then synthesized on the surface of the talc powder using chromium nitrate nonahydrate and terephthalic acid as raw materials, forming a talc powder / MIL-101 composite material. Finally, nano-tantalum powder is loaded into the pores of the talc powder / MIL-101 composite material to obtain the refining agent. After being introduced into the aluminum alloy melt, the refining agent, through the synergistic effect between talc powder, MIL-101, and nano-tantalum powder, improves the adsorption performance of the impurity remover, enabling it to adsorb large amounts of hydrogen, oxygen, and oxide inclusions in the alloy melt, thereby significantly improving the purity of the aluminum alloy melt and enhancing the corrosion resistance and crack resistance of the aluminum alloy material. Talc powder, as the base, possesses excellent adsorption properties. When blended with ammonium sulfate, the corrosive gases generated by the thermal decomposition of ammonium sulfate at high temperatures corrode the surface and interior of the talc powder, forming a large number of irregular... The high-density pores enhance the adsorption performance of the composite material. The increased pore size, coupled with the addition of MIL-101, increases the specific surface area of ​​talc powder, thereby improving the adsorption force between hydrogen molecules in the molten aluminum alloy and the surface of the refining agent. This effectively reduces the hydrogen content in the aluminum alloy, decreases needle-like pores, and significantly improves the purity and density of the matrix. Finally, utilizing the excellent pore structure of the refining agent, nano-tantalum powder is loaded into the pores. Tantalum can combine with oxygen, adsorbing oxygen in the melt and improving the purity of the molten aluminum alloy, thus enhancing the corrosion resistance of the aluminum alloy material. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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. Example

[0025] The refining agent is prepared by the following steps:

[0026] Step A1: Mix 1g of talc powder and 0.01g of ammonium sulfate and grind them. Place the ground product in a quartz crucible and heat-treat it at 1300℃ under nitrogen for 2.5h. Then cool it naturally to room temperature to obtain porous talc powder.

[0027] Step A2: Disperse 3g of chromium nitrate nonahydrate and 1.4g of terephthalic acid in 50mL of 0.05mol / L sodium acetate aqueous solution, and sonicate for 30min. Then add 0.045g of porous talc powder and stir for 10min. Then transfer to an autoclave and hydrothermally react at 180℃ for 12h. Centrifuge, wash and dry to obtain talc powder / MIL-101 composite material.

[0028] Step A3: Add 1g of talc / MIL-101 composite material to 50g of ethanol and mix for 10min. Under nitrogen conditions, add 0.1g of nano tantalum powder and sonicate for 30min. Then, distill under reduced pressure to obtain the refining agent. Example

[0029] The refining agent is prepared by the following steps:

[0030] Step A1: Mix and grind 2g of talc powder and 0.03g of ammonium sulfate. Place the ground product in a quartz crucible and heat-treat it at 1350℃ under nitrogen for 3 hours. Then, let it cool naturally to room temperature to obtain porous talc powder.

[0031] Step A2: Disperse 3.5g of chromium nitrate nonahydrate and 1.55g of terephthalic acid in 50mL of 0.05mol / L sodium acetate aqueous solution, and sonicate for 30min. Then add 0.1g of porous talc powder and stir for 20min. Then transfer to an autoclave and hydrothermally react at 190℃ for 12h. Centrifuge, wash and dry to obtain talc powder / MIL-101 composite material.

[0032] Step A3: Add 3g of talc / MIL-101 composite material to 50g of ethanol and mix for 10min. Under nitrogen conditions, add 0.5g of nano tantalum powder and sonicate for 30min. Then, distill under reduced pressure to obtain the refining agent. Example

[0033] The refining agent is prepared by the following steps:

[0034] Step A1: Mix and grind 3g of talc powder and 0.05g of ammonium sulfate. Place the ground product in a quartz crucible and heat-treat it at 1400℃ under nitrogen for 3.5h. Then, allow it to cool naturally to room temperature to obtain porous talc powder.

[0035] Step A2: Disperse 4g of chromium nitrate nonahydrate and 1.7g of terephthalic acid in 50mL of 0.05mol / L sodium acetate aqueous solution, and sonicate for 30min. Then add 0.15g of porous talc powder and stir for 30min. Then transfer to an autoclave and hydrothermally react at 200℃ for 12h. Centrifuge, wash and dry to obtain talc powder / MIL-101 composite material.

[0036] Step A3: Add 5g of talc / MIL-101 composite material to 50g of ethanol and mix for 10min. Under nitrogen conditions, add 1g of nano tantalum powder and sonicate for 30min. Then, distill under reduced pressure to obtain the refining agent. Example

[0037] A crack-resistant aluminum alloy material for door sill beams in new energy vehicles, comprising the following raw materials in total quantity:

[0038] Cu: 0.1 wt%, Ti: 0.05 wt%, Mg: 0.8 wt%, Mo: 0.02 wt%, V: 0.01 wt%, Co: 0.01 wt%, balance being Al and unavoidable impurities;

[0039] The crack-resistant aluminum alloy material for the door sill beam of this new energy vehicle is prepared by the following steps:

[0040] Step S1: Prepare the amount of each component raw material according to the ratio, then place each raw material in deionized water and sonicate for 30 minutes, then put the treated raw materials into the melting furnace and melt them at 700℃ until the raw materials are completely melted to obtain aluminum alloy liquid.

[0041] Step S2: Add the refining agent prepared in Example 1 to the above-mentioned aluminum alloy liquid, stir electromagnetically for 5 minutes, and then heat-treat for 10 minutes to obtain the refined aluminum alloy liquid. The amount of the refining agent prepared in Example 1 is 1.5 wt% of the aluminum alloy liquid.

[0042] Step S3: The refined aluminum alloy liquid is continuously cast using a hydraulic casting machine and a casting pan to obtain aluminum rods. The rods are then subjected to two homogenization treatments and cooled. The resulting aluminum alloy rods are sawn into 1m short rods to obtain the aluminum alloy material. The conditions for the first homogenization treatment are: heating to 460℃ at a heating rate of 70℃ / h and holding for 12h; the conditions for the second homogenization treatment are: temperature of 560℃ and holding for 10h. Example

[0043] A crack-resistant aluminum alloy material for door sill beams in new energy vehicles, comprising the following raw materials in total quantity:

[0044] Cu: 0.2wt%, Ti: 0.1wt%, Mg: 1.2wt%, Mo: 0.04wt%, V: 0.025wt%, Co: 0.02wt%, balance being Al and unavoidable impurities;

[0045] The crack-resistant aluminum alloy material for the door sill beam of this new energy vehicle is prepared by the following steps:

[0046] Step S1: Prepare the amount of each component raw material according to the ratio, then place each raw material in deionized water and sonicate for 30 minutes. Then put the treated raw materials into the melting furnace and melt them at 720°C until they are completely melted to obtain aluminum alloy liquid.

[0047] Step S2: Add the refining agent prepared in Example 2 to the above-mentioned aluminum alloy liquid, stir electromagnetically for 7 minutes, and then heat-treat for 15 minutes to obtain the refined aluminum alloy liquid. The amount of the refining agent prepared in Example 2 is 2.5 wt% of the aluminum alloy liquid.

[0048] Step S3: The refined aluminum alloy liquid is continuously cast using a hydraulic casting machine and a casting pan to obtain aluminum rods. The rods are then subjected to two homogenization treatments and cooled. The resulting aluminum alloy rods are sawn into 1m short rods to obtain the aluminum alloy material. The conditions for the first homogenization treatment are: heating to 480℃ at a heating rate of 70℃ / h and holding for 12h; the conditions for the second homogenization treatment are: temperature of 570℃ and holding for 14h. Example

[0049] A crack-resistant aluminum alloy material for door sill beams in new energy vehicles, comprising the following raw materials in total quantity:

[0050] Cu: 0.3wt%, Ti: 0.15wt%, Mg: 1.5wt%, Mo: 0.07wt%, V: 0.04wt%, Co: 0.03wt%, balance being Al and unavoidable impurities;

[0051] The crack-resistant aluminum alloy material for the door sill beam of this new energy vehicle is prepared by the following steps:

[0052] Step S1: Prepare the amount of each component raw material according to the ratio, then place each raw material in deionized water and sonicate for 30 minutes. Then put the treated raw materials into the melting furnace and melt them at 750°C until they are completely melted to obtain aluminum alloy liquid.

[0053] Step S2: Add the refining agent prepared in Example 3 to the above-mentioned aluminum alloy liquid, stir electromagnetically for 10 min, and then heat-treat for 20 min to obtain the refined aluminum alloy liquid. The amount of the refining agent prepared in Example 3 is 3.0 wt% of the aluminum alloy liquid.

[0054] Step S3: The refined aluminum alloy liquid is continuously cast using a hydraulic casting machine and a casting pan to obtain aluminum rods. The rods are then subjected to two homogenization treatments and cooled. The resulting aluminum alloy rods are sawn into 1m short rods to obtain the aluminum alloy material. The conditions for the first homogenization treatment are: heating to 500℃ at a heating rate of 70℃ / h and holding for 12h; the conditions for the second homogenization treatment are: temperature of 580℃ and holding for 16h.

[0055] Comparative Example 1

[0056] This comparative example is an aluminum alloy material. The difference between this example and Example 6 is that the refining agent NK-2 is used instead of the refining agent prepared in Example 3. All other aspects are the same.

[0057] The aluminum alloy materials prepared in Examples 4-6 and Comparative Example 1 were subjected to performance tests:

[0058] Corrosion resistance test: Hydrogen sulfide corrosion resistance was tested according to NACE™ 0177-2016 standard, and the sample surface was observed.

[0059] Tensile strength and elongation tests: Tested in accordance with GB / T 1173-2013 standard;

[0060] The test results are shown in the table below:

[0061] Corrosion resistance Tensile strength / MPa Elongation / % Example 4 No obvious phenomenon 354 14.68 Example 5 No obvious phenomenon 361 15.36 Example 6 No obvious phenomenon 376 16.21 Comparative Example 1 Slight corrosion 286 11.32

[0062] As can be seen from the table above, the aluminum alloy material prepared by this invention showed no obvious corrosion after corrosion resistance, tensile strength and elongation tests. The tensile strength was in the range of 354MPa-376MPa and the elongation was in the range of 14.68%-16.21%, indicating that the aluminum alloy material has excellent crack resistance and has good application prospects in the door sill beam of new energy vehicles.

[0063] The above content 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 scope defined by the inventive concept, they should all fall within the protection scope of the present invention.

Claims

1. A crack-resistant aluminum alloy material for door sill beams in new energy vehicles, characterized in that, In total, the raw materials are as follows: Cu: 0.1wt%-0.3wt%, Ti: 0.05wt%-0.15wt%, Mg: 0.8wt%-1.5wt%, Mo: 0.02wt%-0.07wt%, V: 0.01wt%-0.04wt%, Co: 0.01wt%-0.03wt%, with the balance being Al and unavoidable impurities; The crack-resistant aluminum alloy material for the door sill beam of the new energy vehicle is prepared by the following steps: Step S1: Prepare the amount of each component raw material according to the ratio, then place each raw material in deionized water and sonicate for 30 minutes. Then put the treated raw materials into the melting furnace and melt them at 700-750℃ until the raw materials are completely melted to obtain aluminum alloy liquid. Step S2: Add refining agent to the above aluminum alloy liquid, stir electromagnetically for 5-10 minutes, and then heat-treat for 10-20 minutes to obtain refined aluminum alloy liquid. Step S3: The refined aluminum alloy liquid is continuously cast through a hydraulic casting machine and a casting pan to obtain aluminum rods. The rods are then homogenized twice, cooled, and the resulting aluminum alloy rods are sawn into 1m short rods to obtain aluminum alloy materials. The refining agent is prepared by the following steps: Step A1: Mix and grind talc powder and ammonium sulfate. Place the ground product in a quartz crucible and heat-treat it at 1300-1400℃ under nitrogen for 2.5-3.5 hours. Allow it to cool naturally to room temperature to obtain porous talc powder. Step A2: Disperse chromium nitrate nonahydrate and terephthalic acid in 0.05 mol / L sodium acetate aqueous solution and sonicate for 30 min. Then add porous talc powder and stir for 10-30 min. Transfer to an autoclave and hydrothermally react at 180-200℃ for 12 h. Centrifuge, wash and dry to obtain talc powder / MIL-101 composite material. Step A3: Add the talc / MIL-101 composite material to ethanol and mix for 10 min. Under nitrogen conditions, add nano tantalum powder and sonicate for 30 min. Then, distill under reduced pressure to obtain the refining agent.

2. The crack-resistant aluminum alloy material for door sill beams of new energy vehicles according to claim 1, characterized in that, In step S2, the amount of refining agent used is 1.5wt%-3.0wt% of the aluminum alloy liquid.

3. The crack-resistant aluminum alloy material for door sill beams of new energy vehicles according to claim 1, characterized in that, In step S3, the conditions for the first homogenization treatment are: heating to 460-500℃ at a heating rate of 70℃ / h, and holding for 12h; the conditions for the second homogenization treatment are: temperature of 560-580℃, and holding for 10-16h.

4. The crack-resistant aluminum alloy material for door sill beams of new energy vehicles according to claim 1, characterized in that, In step A1, the mass ratio of talc powder to ammonium sulfate is 1-3:0.01-0.

05.

5. The crack-resistant aluminum alloy material for door sill beams of new energy vehicles according to claim 1, characterized in that, In step A2, the ratio of chromium nitrate nonahydrate, terephthalic acid, sodium acetate aqueous solution, and porous talc is 3-4g: 1.4-1.7g: 50mL: 0.045-0.15g.

6. The crack-resistant aluminum alloy material for door sill beams of new energy vehicles according to claim 1, characterized in that, In step A3, the mass ratio of talc / MIL-101 composite material, ethanol, and nano tantalum powder is 1-5:50:0.1-1.