Multi-layer aluminum alloy composite material for high-strength and high-corrosion-resistance liquid cooling plate and preparation method thereof

Abstract

The invention relates to a multi-layer aluminum alloy composite material for a high-strength and high-corrosion-resistance liquid cooling plate and a preparation method thereof, in particular to the multi-layer aluminum alloy composite material for the high-strength and high-corrosion-resistance liquid cooling plate and the preparation method thereof. The invention aims to solve the technical problems that the current mainstream liquid cooling plate is insufficient in corrosion resistance under complex working conditions, and pitting corrosion and intergranular corrosion are easy to occur in long-term cycle use. The multi-layer aluminum alloy comprises a brazing layer, a barrier layer, a core material and an anti-corrosion layer, or comprises a barrier layer, a core material and an anti-corrosion layer; the brazing layer is made of 4343 aluminum alloy or 4045 aluminum alloy, the blocking layer is made of 3003 aluminum alloy or 3003 MOD aluminum alloy, the core material is made of 6xxx alloy, and the anti-corrosion layer is made of 1xxx series aluminum alloy. The method comprises the steps of smelting and casting; composite hot rolling; and cold rolling. The 1xxx series aluminum alloy is rolled and compounded on one side of the upper panel and one side of the lower panel of the liquid cooling plate, so that the corrosion resistance is remarkably improved, pitting corrosion is effectively inhibited from expanding to the core material, and the service life of the liquid cooling plate is prolonged. The multi-layer aluminum alloy composite material is suitable for being used for the high-strength and high-corrosion-resistance liquid cooling plate.

Description

Technical Field

[0001] This invention belongs to the field of materials science and technology, specifically relating to multilayer aluminum alloy composite materials for high-strength and high-corrosion-resistant liquid-cooled plates and their preparation methods. Background Technology

[0002] As market demands for liquid cooling plates increase, the materials and processes for these plates are facing multiple challenges. While current mainstream liquid cooling plates offer lightweight advantages, they cannot meet the structural support requirements of high-load applications (such as automotive chassis and aerospace structural components). Furthermore, their corrosion resistance is insufficient under complex operating conditions, making them prone to pitting corrosion and intergranular corrosion during long-term cyclic use. This increases the risk of coolant leakage and significantly raises safety hazards. Currently, in the new energy vehicle sector, many leading automakers have incorporated high-strength, corrosion-resistant aluminum alloys into their procurement standards, requiring liquid cooling plates to have a salt spray resistance of ≥1000 hours, a coolant corrosion resistance of ≥5000 hours, and a strength of ≥200 MPa. Summary of the Invention

[0003] The purpose of this invention is to solve the technical problems of insufficient corrosion resistance of current mainstream liquid cooling plates under complex working conditions and easy pitting corrosion and intergranular corrosion during long-term cyclic use, and to provide a multilayer aluminum alloy composite material for high-strength and high-corrosion-resistant liquid cooling plates and its preparation method.

[0004] A multilayer aluminum alloy composite material for high-strength and high-corrosion-resistant liquid cooling plates, comprising an A composite plate and a B composite plate. The layer structure of the A composite plate is, in sequence, a brazing layer (1), a barrier layer (2), a core material (3), and an anti-corrosion layer (4); the layer structure of the B composite plate is, in sequence, a barrier layer (2), a core material (3), and an anti-corrosion layer (4); the brazing layer (1) is made of 4343 aluminum alloy or 4045 aluminum alloy, the barrier layer (2) is made of 3003 aluminum alloy or 3003MOD aluminum alloy, the core material (3) is made of 6xxx series aluminum alloy, and the anti-corrosion layer (4) is made of 1xxx series aluminum alloy.

[0005] Furthermore, the mass percentage of each element in the 4343 aluminum alloy is: Si: 6.8~8.2%, Fe≤0.8%, Cu≤0.25%, Mn≤0.1%, Zn≤0.2% and the balance Al;

[0006] The mass percentage of each element in the 4045 aluminum alloy is as follows: Si: 9~11%, Fe≤0.8%, Cu≤0.30%, Mn≤0.05%, Mg≤0.05%, Zn≤0.1%, Ti≤0.2%, and the balance Al.

[0007] Furthermore, the mass percentage content of each element in the 3003 aluminum alloy is Si≤0.6%, Fe≤0.7%, Cu:0.05~0.20%, Mn:1.0~1.5%, Zn≤0.1% and the balance Al;

[0008] The mass percentage of each element in the 3003MOD aluminum alloy is as follows: Si: 0.2~0.8%, Fe: 0.2~0.8%, Cu: 0.3~1.1%, Mn: 1.2~1.9%, Ti: 0.05~0.25%, and the balance Al.

[0009] Furthermore, the mass percentage of each element in the 6xxx series aluminum alloy is as follows: Si: 0.5~1.2%, Fe≤0.6%, Cu: 0.15~0.6%, Mn: 0.15~0.6%, Mg: 0.6~1.3%, Zr: 0.03~0.12%, Zn≤0.4%, Ti≤0.1%, Cr≤0.2%, and the balance Al.

[0010] Furthermore, the mass percentage of each element in the 1xxx series aluminum alloy is Si≤0.35%, Fe≤0.5%, Cu≤0.3%, Mn≤0.3%, Mg≤0.3%, Zn≤0.1%, Ti≤0.2%, and the balance is Al.

[0011] The preparation method of the high-strength, high-corrosion-resistant liquid-cooled plate multilayer aluminum alloy composite material is carried out according to the following steps:

[0012] I. Smelting:

[0013] According to the alloy composition ratio of the brazing layer (1), barrier layer (2), core material (3) and anti-corrosion layer (4), the materials are prepared and smelted respectively to obtain the aluminum liquid of the brazing layer, the aluminum liquid of the barrier layer, the aluminum liquid of the core material and the aluminum liquid of the anti-corrosion layer respectively.

[0014] II. Casting:

[0015] The aluminum liquid obtained in step one is successively passed through a converter, refining, settling, degassing and filtering before casting. Then the qualified ingot is sawed and milled to obtain the brazed layer (1).

[0016] The aluminum liquid of the barrier layer obtained in step one is successively passed through a converter, refining, settling, degassing and filtering before casting. Then the qualified ingot is sawed and milled to obtain the barrier layer (2).

[0017] The aluminum liquid obtained in step one is successively passed through a converter, refining, settling, degassing and filtering before casting. Then, the qualified ingots are subjected to homogenization annealing and then sawing and milling to obtain the core material (3).

[0018] The aluminum liquid with anti-corrosion layer obtained in step one is successively passed through converter-refining-standing-degassing-filtration and then cast. Then the qualified ingot is sawed and milled to obtain the anti-corrosion layer (4).

[0019] III. Composite Hot Rolling:

[0020] The brazing layer (1), barrier layer (2), core material (3) and anti-corrosion layer (4) obtained in step 2 are placed and welded together to obtain a composite billet. Then, composite hot rolling is carried out and finally rolled to 4~8mm to obtain a hot-rolled plate.

[0021] IV. Cold rolling:

[0022] The hot-rolled plate obtained in step three is subjected to multiple cold rolling passes, and then the finished product is annealed to obtain a multi-layer aluminum alloy composite material for high-strength and high-corrosion-resistant liquid-cooled plates with a finished thickness of 1.0 mm to 3 mm, thus completing the preparation method described above.

[0023] Furthermore, the brazing layer (1), barrier layer (2), and anti-corrosion layer (4) obtained in step two have the same dimensions: 2500~6000mm in length, 1000~2000mm in width, and 20~200mm in thickness; the core material (3) has a length of 2500~6000mm, a width of 1000~2000mm, and a thickness of 300~650mm.

[0024] The dimensions of the brazing layer (1), barrier layer (2), core material (3), and anti-corrosion layer (4) are controlled according to the finished product dimensions and coverage rate; the coverage rate of the brazing layer (1) is 3.5%~24%, and the coverage rate of the brazing layer (1) = brazing layer thickness / total thickness of composite blank × 100%; the coverage rate of the barrier layer (2) is 3.5%~24%, and the coverage rate of the barrier layer (2) = barrier layer thickness / total thickness of composite blank × 100%; the coverage rate of the anti-corrosion layer (4) is 3%~12%, and the coverage rate of the anti-corrosion layer (4) = anti-corrosion layer thickness / total thickness of composite blank × 100%.

[0025] Furthermore, the homogenization annealing process described in step two is as follows: holding at 500℃~610℃ for 10h~48h.

[0026] Furthermore, the welding and fixing described in step three involves rivet welding, and both the upper and lower layers of the multilayer composite board are welded together using rivets.

[0027] Furthermore, the composite hot rolling process described in step three is: holding at 420℃~500℃ for 4h~12h;

[0028] The finished product annealing process described in step four is as follows: heat treatment at 300℃~450℃ for 1~5 hours.

[0029] Beneficial effects of this invention:

[0030] This invention involves rolling a 3%–12% cladding layer of 1xxx series aluminum alloy onto one side of a liquid cooling plate and the other side. This significantly improves the mechanical properties of the liquid cooling plate, enhances its corrosion resistance, effectively inhibits pitting corrosion from spreading to the core material, and substantially extends the service life of the liquid cooling plate. Furthermore, the rolling composite process employed in this invention is suitable for large-scale industrial production, enabling stable industrial-scale production of the material.

[0031] This invention is applicable to the use of multilayer aluminum alloy composite materials for high-strength and high-corrosion-resistant liquid cooling plates in various fields such as communications, energy storage, and passenger vehicles. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the battery liquid cooling plate obtained in Example 1;

[0033] Figure 2 The diagram shows the structure of composite plate A and composite plate B of multilayer aluminum alloy composite material for high-strength and high-corrosion-resistant liquid cooling plate obtained in Example 1, where: 1 represents the brazing layer, 2 represents the barrier layer, 3 represents the core material, and 4 represents the anti-corrosion layer.

[0034] Figure 3 Corrosion depth maps at different scales for the multilayer aluminum alloy composite material for high-strength, high-corrosion-resistant liquid cooling plates prepared in Example 1;

[0035] Figure 4 Corrosion depth maps at different scales for the multilayer aluminum alloy composite material for high-strength, high-corrosion-resistant liquid-cooled plates prepared in Example 2;

[0036] Figure 5 The image shows the corrosion depth of the multilayer aluminum alloy composite material for high-strength, high-corrosion-resistant liquid cooling plates prepared in Comparative Example 1. Detailed Implementation

[0037] Specific implementation method one: This implementation method uses a multilayer aluminum alloy composite material for high-strength and high-corrosion-resistant liquid cooling plates. The multilayer aluminum alloy composite material includes an A composite plate and a B composite plate. The layer structure of the A composite plate is, in sequence, a brazing layer (1), a barrier layer (2), a core material (3), and an anti-corrosion layer (4); the layer structure of the B composite plate is, in sequence, a barrier layer (2), a core material (3), and an anti-corrosion layer (4); the brazing layer (1) is made of 4343 aluminum alloy or 4045 aluminum alloy, the barrier layer (2) is made of 3003 aluminum alloy or 3003MOD aluminum alloy, the core material (3) is made of 6xxx series aluminum alloy, and the anti-corrosion layer (4) is made of 1xxx series aluminum alloy.

[0038] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that the mass percentage content of each element in the 4343 aluminum alloy is: Si: 6.8~8.2%, Fe≤0.8%, Cu≤0.25%, Mn≤0.1%, Zn≤0.2%, and the balance Al;

[0039] The mass percentage of each element in the 4045 aluminum alloy is as follows: Si: 9~11%, Fe≤0.8%, Cu≤0.30%, Mn≤0.05%, Mg≤0.05%, Zn≤0.1%, Ti≤0.2%, and the balance is Al. Other aspects are the same as in Specific Embodiment 1.

[0040] Specific Implementation Method Three: This implementation method differs from Specific Implementation Method One or Two in that the mass percentage content of each element in the 3003 aluminum alloy is Si≤0.6%, Fe≤0.7%, Cu:0.05~0.20%, Mn:1.0~1.5%, Zn≤0.1%, and the balance Al;

[0041] The 3003MOD aluminum alloy contains the following elemental mass percentages: Si: 0.2-0.8%, Fe: 0.2-0.8%, Cu: 0.3-1.1%, Mn: 1.2-1.9%, Ti: 0.05-0.25%, and the balance Al. Other aspects are the same as in specific embodiments one or two.

[0042] Specific Implementation Method Four: This implementation method differs from Specific Implementation Methods One to Three in that the mass percentage content of each element in the 6xxx series aluminum alloy is: Si: 0.5~1.2%, Fe≤0.6%, Cu: 0.15~0.6%, Mn: 0.15~0.6%, Mg: 0.6~1.3%, Zr: 0.03~0.12%, Zn≤0.4%, Ti≤0.1%, Cr≤0.2%, and the balance Al. Everything else is the same as in Specific Implementation Methods One to Three.

[0043] Specific Implementation Method Five: This implementation method differs from Specific Implementation Methods One to Four in that the mass percentage content of each element in the 1xxx series aluminum alloy is Si≤0.35%, Fe≤0.5%, Cu≤0.3%, Mn≤0.3%, Mg≤0.3%, Zn≤0.1%, Ti≤0.2%, and the balance is Al. Everything else is the same as in Specific Implementation Methods One to Four.

[0044] Specific Implementation Method Six: The preparation method of the multilayer aluminum alloy composite material for high-strength and high-corrosion-resistant liquid-cooled plates in this implementation method is carried out according to the following steps:

[0045] I. Smelting:

[0046] According to the alloy composition ratio of the brazing layer (1), barrier layer (2), core material (3) and anti-corrosion layer (4), the materials are prepared and smelted respectively to obtain the aluminum liquid of the brazing layer, the aluminum liquid of the barrier layer, the aluminum liquid of the core material and the aluminum liquid of the anti-corrosion layer respectively.

[0047] II. Casting:

[0048] The aluminum liquid obtained in step one is successively passed through a converter, refining, settling, degassing and filtering before casting. Then the qualified ingot is sawed and milled to obtain the brazed layer (1).

[0049] The aluminum liquid of the barrier layer obtained in step one is successively passed through a converter, refining, settling, degassing and filtering before casting. Then the qualified ingot is sawed and milled to obtain the barrier layer (2).

[0050] The aluminum liquid obtained in step one is successively passed through a converter, refining, settling, degassing and filtering before casting. Then, the qualified ingots are subjected to homogenization annealing and then sawing and milling to obtain the core material (3).

[0051] The aluminum liquid with anti-corrosion layer obtained in step one is successively passed through converter-refining-standing-degassing-filtration and then cast. Then the qualified ingot is sawed and milled to obtain the anti-corrosion layer (4).

[0052] III. Composite Hot Rolling:

[0053] The brazing layer (1), barrier layer (2), core material (3) and anti-corrosion layer (4) obtained in step 2 are placed and welded together to obtain a composite billet. Then, composite hot rolling is carried out and finally rolled to 4~8mm to obtain a hot-rolled plate.

[0054] IV. Cold rolling:

[0055] The hot-rolled plate obtained in step three is subjected to multiple cold rolling passes, and then the finished product is annealed to obtain a multi-layer aluminum alloy composite material for high-strength and high-corrosion-resistant liquid-cooled plates with a finished thickness of 1.0 mm to 3 mm, thus completing the preparation method described above.

[0056] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Method Six in that the brazing layer (1), barrier layer (2), and anti-corrosion layer (4) obtained in step two have the same dimensions: 2500~6000mm in length, 1000~2000mm in width, and 20~200mm in thickness; the core material (3) has a length of 2500~6000mm, a width of 1000~2000mm, and a thickness of 300~650mm.

[0057] The dimensions of the brazing layer (1), barrier layer (2), core material (3), and anti-corrosion layer (4) are controlled according to the finished product dimensions and coverage rate; the coverage rate of the brazing layer (1) is 3.5%~24%, and the coverage rate of the brazing layer (1) = brazing layer thickness / total thickness of composite blank × 100%; the coverage rate of the barrier layer (2) is 3.5%~24%, and the coverage rate of the barrier layer (2) = barrier layer thickness / total thickness of composite blank × 100%; the coverage rate of the anti-corrosion layer (4) is 3%~12%, and the coverage rate of the anti-corrosion layer (4) = anti-corrosion layer thickness / total thickness of composite blank × 100%. Other aspects are the same as in specific embodiment six.

[0058] Specific Implementation Method Eight: This implementation method differs from Specific Implementation Methods Six or Seven in that the homogenization annealing process in step two is performed at 500℃~610℃ for 10h~48h. Everything else is the same as in Specific Implementation Methods Six or Seven.

[0059] Specific Implementation Method Nine: This implementation method differs from Specific Implementation Methods Six to Eight in that the welding and fixing in step three is done using rivets, and both the upper and lower layers of the multilayer composite board are welded together using rivets. Everything else is the same as in Specific Implementation Methods Six to Eight.

[0060] Specific Implementation Method 10: This implementation method differs from Specific Implementation Methods 6 to 9 in that the composite hot rolling process described in step 3 is: heat preservation at 420℃~500℃ for 4h~12h;

[0061] The annealing process for the finished product described in step four is as follows: holding at 300℃~450℃ for 1~5 hours. Other aspects are the same as in specific embodiments six to nine.

[0062] The scope of this invention is not limited to the above-described embodiments; a combination of one or more specific embodiments can also achieve the purpose of the invention.

[0063] Example 1

[0064] This embodiment describes a method for preparing multilayer aluminum alloy composite materials for high-strength, high-corrosion-resistant liquid-cooled plates, which is carried out according to the following steps:

[0065] I. Smelting:

[0066] According to the respective alloy composition ratios of the brazing layer (1), barrier layer (2), core material (3) and anti-corrosion layer (4), or the barrier layer (2), core material (3) and anti-corrosion layer (4), the aluminum liquid of the brazing layer, the aluminum liquid of the barrier layer, the aluminum liquid of the core material and the aluminum liquid of the anti-corrosion layer are prepared and smelted respectively to obtain the aluminum liquid of the brazing layer, the aluminum liquid of the barrier layer, the aluminum liquid of the core material and the aluminum liquid of the anti-corrosion layer respectively.

[0067] II. Casting:

[0068] The aluminum liquid of the above-mentioned brazing layer is successively passed through a converter, refining, settling, degassing and filtering before casting. Then, the qualified ingot is sawed and milled to obtain the brazing layer (1).

[0069] The aluminum liquid of the above barrier layer is successively passed through a converter, refining, settling, degassing and filtering before casting. Then, the qualified ingot is sawed and milled to obtain the barrier layer (2).

[0070] The aluminum liquid of the above core material is successively passed through a converter, refining, settling, degassing and filtering before casting. Then, the qualified ingots are subjected to homogenization annealing treatment and then sawing and milling treatment to obtain the core material (3).

[0071] The aluminum liquid of the above-mentioned anti-corrosion layer is successively passed through a converter, refining, settling, degassing and filtering before casting. Then, the qualified ingot is sawed and milled to obtain the anti-corrosion layer (4).

[0072] III. Composite Hot Rolling:

[0073] The above-mentioned brazing layer (1), barrier layer (2), core material (3) and anti-corrosion layer (4), or barrier layer (2), core material (3) and anti-corrosion layer (4) are placed and welded together to obtain a composite billet, and then composite hot rolling is carried out to finally roll to 6mm to obtain a hot-rolled plate.

[0074] IV. Cold rolling:

[0075] The hot-rolled plate is subjected to multiple cold rolling passes, followed by finished product annealing, to finally obtain a high-strength, high-corrosion-resistant liquid-cooled multilayer aluminum alloy composite material with a finished product thickness of 1.2 mm, thus completing the preparation method described above.

[0076] The alloy composition ratios of the brazing layer (1), barrier layer (2), core material (3), and anti-corrosion layer (4) mentioned in step one of this embodiment, or the barrier layer (2), core material (3), and anti-corrosion layer (4), are shown in Table 1.

[0077] The brazing layer (1), barrier layer (2) and anti-corrosion layer (4) obtained in step two of this embodiment have the same size specifications: 2500~6000mm in length, 1000~2000mm in width, and 20~200mm in thickness; the core material (3) has a length of 2500~6000mm, a width of 1000~2000mm, and a thickness of 300~650mm.

[0078] The specific dimensions of the brazing layer (1), barrier layer (2), core material (3) and anti-corrosion layer (4) are adjusted according to the finished product dimensions and the coverage rate. The coverage rate of the brazing layer (1) is controlled at 10%, and the coverage rate = brazing layer thickness / total thickness of composite blank × 100%. The coverage rate of the barrier layer (2) is controlled at 15%, and the coverage rate = barrier layer thickness / total thickness of composite blank × 100%. The coverage rate of the anti-corrosion layer (4) is controlled at 5%, and the coverage rate = anti-corrosion layer thickness / total thickness of composite blank × 100%.

[0079] The homogenization annealing treatment described in step two of this embodiment involves holding the temperature at 575°C for 24 hours.

[0080] The welding and fixing described in step three of this embodiment is done by riveting, and both the upper and lower layers of the multilayer composite board are welded together by riveting.

[0081] The composite hot rolling described in step three of this embodiment involves holding at 500℃ for 5 hours.

[0082] The finished product annealing described in step four of this embodiment involves holding at 300°C for 3 hours.

[0083] The high-strength, high-corrosion-resistant liquid cooling plate multilayer aluminum alloy composite material prepared in this embodiment includes composite plate A and composite plate B. The layer structure of composite plate A is, in sequence, a brazing layer (1), a barrier layer (2), a core material (3), and an anti-corrosion layer (4); the layer structure of composite plate B is, in sequence, a barrier layer (2), a core material (3), and an anti-corrosion layer (4). In application, composite plate A and composite plate B are brazed together to form a battery liquid cooling plate.

[0084] The structural diagrams of composite plates A and B of the multilayer aluminum alloy composite material for high-strength and high-corrosion-resistant liquid-cooled plates prepared in this embodiment are shown below. Figure 2 As shown.

[0085] Example 2:

[0086] A method for preparing multilayer aluminum alloy composite materials for high-strength, high-corrosion-resistant liquid-cooled plates, comprising the following steps:

[0087] I. Smelting:

[0088] According to the respective alloy composition ratios of the brazing layer (1), barrier layer (2), core material (3) and barrier layer (2), or barrier layer (2), core material (3) and barrier layer (2), the aluminum liquid of the brazing layer, the aluminum liquid of the barrier layer and the aluminum liquid of the core material are respectively prepared and smelted to obtain the aluminum liquid of the brazing layer, the aluminum liquid of the barrier layer and the aluminum liquid of the core material.

[0089] II. Casting:

[0090] The aluminum liquid of the above-mentioned brazing layer is successively passed through a converter, refining, settling, degassing and filtering before casting. Then, the qualified ingot is sawed and milled to obtain the brazing layer (1).

[0091] The aluminum liquid of the above barrier layer is successively passed through a converter, refining, settling, degassing and filtering before casting. Then, the qualified ingot is sawed and milled to obtain the barrier layer (2).

[0092] The aluminum liquid of the above core material is successively passed through a converter, refining, settling, degassing and filtering before casting. Then, the qualified ingots are subjected to homogenization annealing treatment and then sawing and milling treatment to obtain the core material (3).

[0093] III. Composite Hot Rolling:

[0094] The above-mentioned brazing layer (1), barrier layer (2), core material (3) and barrier layer (2) or barrier layer (2), core material (3) and barrier layer (2) are placed and welded together to obtain a composite billet, and then composite hot rolling is performed to finally roll to 6mm to obtain a hot-rolled plate.

[0095] IV. Cold rolling:

[0096] The hot-rolled plate is subjected to multiple cold rolling passes, followed by finished product annealing, to finally obtain a high-strength, high-corrosion-resistant liquid-cooled multilayer aluminum alloy composite material with a finished product thickness of 1.2 mm, thus completing the preparation method described above.

[0097] The alloy composition ratios of the brazing layer (1), barrier layer (2), core material (3), and barrier layer (2) in step one of this embodiment, or the barrier layer (2), core material (3), and barrier layer (2), are shown in Table 1.

[0098] The brazing layer (1), barrier layer (2) and anti-corrosion layer (4) obtained in step two of this embodiment have the same size specifications: 2500~6000mm in length, 1000~2000mm in width, and 20~200mm in thickness; the core material (3) has a length of 2500~6000mm, a width of 1000~2000mm, and a thickness of 300~650mm.

[0099] The specific dimensions of the brazing layer (1), barrier layer (2), and core material (3) are adjusted according to the finished product dimensions and the coverage rate. The coverage rate of the brazing layer (1) is controlled at 10%, and the coverage rate = brazing layer thickness / total thickness of composite blank × 100%. The coverage rate of the barrier layer (2) is controlled at 15%, and the coverage rate = barrier layer thickness / total thickness of composite blank × 100%. The homogenization annealing treatment in step two of this embodiment is: heat preservation at 575℃ for 24 hours.

[0100] The welding and fixing described in step three of this embodiment is done by riveting, and both the upper and lower layers of the multilayer composite board are welded together by riveting.

[0101] The composite hot rolling described in step three of this embodiment involves holding at 500℃ for 5 hours.

[0102] The finished product annealing described in step four of this embodiment involves holding at 300°C for 3 hours.

[0103] This embodiment presents a schematic diagram of the structure of the novel high-strength, high-corrosion-resistant multilayer aluminum alloy composite material for liquid-cooled plates, as shown below. Figure 2 As shown.

[0104] Comparative Example 1:

[0105] The difference between this embodiment and Embodiment 1 is that: Comparative Embodiment 1 has a double-layer structure, which consists of a brazing layer (1) and a core material (2). The core material alloy is the same as the barrier layer alloy of Embodiment 1. Everything else is the same as Embodiment 1.

[0106] Table 1. Alloy composition ratios (wt.%) of the brazing layer, core material, barrier layer, and anti-corrosion layer in the examples and comparative examples.

[0107]

[0108] result:

[0109] The mechanical properties and copper-accelerated salt spray corrosion resistance of the multilayer aluminum alloy composite materials for high-strength, high-corrosion-resistant liquid cooling plates prepared in the test examples are shown in Tables 2 and 3. Table 2 shows that the mechanical properties of the multilayer composite materials of Examples 1 and 2 before and after brazing are higher than those of the double-layer composite material of Comparative Example 1. Furthermore, the differences in mechanical properties before and after brazing, as well as after artificial aging treatment, between Examples 1 and 2 are not significant. This indicates that although the outer anti-corrosion layer and barrier layer are made of different alloys, they have little impact on the overall performance of the composite material. Since Comparative Example 1 has no heat-treatable alloy, while Examples 1 and 2 both contain heat-treatable core material 6xxx alloy, the mechanical properties of the composite material are significantly improved after artificial aging treatment, meeting the high-strength requirements of liquid cooling plates and enabling product upgrades. Tables 3 and 4 show the mechanical properties of the multilayer aluminum alloy composite materials for high-strength, high-corrosion-resistant liquid cooling plates prepared in the test examples. Figure 3-5 It can be seen that the corrosion depth of Example 1 after copper-accelerated salt spray corrosion is significantly reduced compared to Example 2 and Comparative Example 1. This indicates that the corrosion resistance of the liquid cooling plate material is greatly improved after adopting the present invention, which can meet the high corrosion resistance requirements of liquid cooling plates. Moreover, the corrosion resistance of the outermost layer made of 1xxx alloy is significantly stronger than that of 3xxx alloy. Therefore, the high corrosion-resistant brazed multilayer aluminum alloy material for liquid cooling plates prepared by the present invention not only significantly improves mechanical properties but also has excellent corrosion resistance, which is beneficial to improving the service life of liquid cooling plates in the field of power batteries.

[0110] Table 2 Mechanical property results of the composite materials in Example 1 and Example 2

[0111]

[0112] Table 2 (Continued) Mechanical property results of composite materials from Examples 1 and 2

[0113]

[0114] Table 3. Results of copper accelerated salt spray corrosion performance of the composite materials in Examples 1, 2, and the comparative example.

[0115]

Claims

1. A multilayer aluminum alloy composite material for high-strength, high-corrosion-resistant liquid-cooled plates, comprising an A composite plate and a B composite plate, wherein the layer structure of the A composite plate is sequentially a brazing layer (1), a barrier layer (2), a core material (3), and an anti-corrosion layer (4); and the layer structure of the B composite plate is sequentially a barrier layer (2), a core material (3), and an anti-corrosion layer (4); characterized in that... The brazing layer (1) is made of 4343 aluminum alloy or 4045 aluminum alloy, the barrier layer (2) is made of 3003 aluminum alloy or 3003MOD aluminum alloy, the core material (3) is made of 6xxx series aluminum alloy, and the anti-corrosion layer (4) is made of 1xxx series aluminum alloy.

2. The multilayer aluminum alloy composite material for high-strength, high-corrosion-resistant liquid-cooled plates according to claim 1, characterized in that... The mass percentage of each element in the 4343 aluminum alloy is: Si: 6.8~8.2%, Fe≤0.8%, Cu≤0.25%, Mn≤0.1%, Zn≤0.2% and the balance Al; The mass percentage of each element in the 4045 aluminum alloy is as follows: Si: 9~11%, Fe≤0.8%, Cu≤0.30%, Mn≤0.05%, Mg≤0.05%, Zn≤0.1%, Ti≤0.2%, and the balance Al.

3. The multilayer aluminum alloy composite material for high-strength, high-corrosion-resistant liquid-cooled plates according to claim 1, characterized in that... The 3003 aluminum alloy contains the following element mass percentages: Si≤0.6%, Fe≤0.7%, Cu:0.05~0.20%, Mn:1.0~1.5%, Zn≤0.1%, and the balance Al. The mass percentage of each element in the 3003MOD aluminum alloy is as follows: Si: 0.2~0.8%, Fe: 0.2~0.8%, Cu: 0.3~1.1%, Mn: 1.2~1.9%, Ti: 0.05~0.25%, and the balance Al.

4. The multilayer aluminum alloy composite material for high-strength, high-corrosion-resistant liquid-cooled plates according to claim 1, characterized in that... The mass percentage of each element in the 6xxx series aluminum alloy is as follows: Si: 0.5~1.2%, Fe≤0.6%, Cu: 0.15~0.6%, Mn: 0.15~0.6%, Mg: 0.6~1.3%, Zr: 0.03~0.12%, Zn≤0.4%, Ti≤0.1%, Cr≤0.2%, and the balance Al.

5. The multilayer aluminum alloy composite material for high-strength, high-corrosion-resistant liquid-cooled plates according to claim 1, characterized in that... The mass percentage of each element in the 1xxx series aluminum alloy is Si≤0.35%, Fe≤0.5%, Cu≤0.3%, Mn≤0.3%, Mg≤0.3%, Zn≤0.1%, Ti≤0.2%, and the balance Al.

6. The method for preparing multilayer aluminum alloy composite material for high-strength, high-corrosion-resistant liquid-cooled plates as described in claim 1, characterized in that... This method is performed in the following steps: I. Smelting: According to the alloy composition ratio of the brazing layer (1), barrier layer (2), core material (3) and anti-corrosion layer (4), the materials are prepared and smelted respectively to obtain the aluminum liquid of the brazing layer, the aluminum liquid of the barrier layer, the aluminum liquid of the core material and the aluminum liquid of the anti-corrosion layer respectively. II. Casting: The aluminum liquid obtained in step one is successively passed through a converter, refining, settling, degassing and filtering before casting. Then the qualified ingot is sawed and milled to obtain the brazed layer (1). The aluminum liquid of the barrier layer obtained in step one is successively passed through a converter, refining, settling, degassing and filtering before casting. Then the qualified ingot is sawed and milled to obtain the barrier layer (2). The aluminum liquid obtained in step one is successively passed through a converter, refining, settling, degassing and filtering before casting. Then, the qualified ingots are subjected to homogenization annealing and then sawing and milling to obtain the core material (3). The aluminum liquid with anti-corrosion layer obtained in step one is successively passed through converter-refining-standing-degassing-filtration and then cast. Then the qualified ingot is sawed and milled to obtain the anti-corrosion layer (4). III. Composite Hot Rolling: The brazing layer (1), barrier layer (2), core material (3) and anti-corrosion layer (4) obtained in step 2 are placed and welded together to obtain a composite billet. Then, composite hot rolling is carried out and finally rolled to 4~8mm to obtain a hot-rolled plate. IV. Cold rolling: The hot-rolled plate obtained in step three is subjected to multiple cold rolling passes, and then the finished product is annealed to obtain a multi-layer aluminum alloy composite material for high-strength and high-corrosion-resistant liquid-cooled plates with a finished thickness of 1.0 mm to 3 mm, thus completing the preparation method described above.

7. The method for preparing multilayer aluminum alloy composite material for high-strength and high-corrosion-resistant liquid-cooled plates according to claim 6, characterized in that... The brazing layer (1), barrier layer (2) and anti-corrosion layer (4) obtained in step two have the same size specifications, with a length of 2500~6000mm, a width of 1000~2000mm, and a thickness of 20~200mm; the core material (3) has a length of 2500~6000mm, a width of 1000~2000mm, and a thickness of 300~650mm; The dimensions of the brazing layer (1), barrier layer (2), core material (3), and anti-corrosion layer (4) are controlled according to the finished product dimensions and coverage rate; the coverage rate of the brazing layer (1) is 3.5%~24%, and the coverage rate of the brazing layer (1) = brazing layer thickness / total thickness of composite blank × 100%; the coverage rate of the barrier layer (2) is 3.5%~24%, and the coverage rate of the barrier layer (2) = barrier layer thickness / total thickness of composite blank × 100%; the coverage rate of the anti-corrosion layer (4) is 3%~12%, and the coverage rate of the anti-corrosion layer (4) = anti-corrosion layer thickness / total thickness of composite blank × 100%.

8. The method for preparing multilayer aluminum alloy composite material for high-strength and high-corrosion-resistant liquid-cooled plates according to claim 6, characterized in that... The homogenization annealing process described in step two is as follows: heat treatment at 500℃~610℃ for 10h~48h.

9. The method for preparing multilayer aluminum alloy composite material for high-strength and high-corrosion-resistant liquid-cooled plates according to claim 6, characterized in that... The welding and fixing described in step three: rivet welding is used, and both the upper and lower layers of the multilayer composite board are welded together with rivets.

10. The method for preparing multilayer aluminum alloy composite material for high-strength, high-corrosion-resistant liquid-cooled plates according to claim 6, characterized in that... The composite hot rolling process described in step three involves holding the temperature at 420℃~500℃ for 4h~12h. The finished product annealing process described in step four is as follows: heat treatment at 300℃~450℃ for 1~5 hours.

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