CN-121992318-A - Preparation method of mirror aluminum material, mirror aluminum material and application

Abstract

The application provides a preparation method of a mirror aluminum material, the mirror aluminum material and application. The preparation method comprises the steps of smelting and semi-continuous casting, homogenizing heat treatment, hot rolling, pre-annealing, cold rolling, mirror rolling and finished product annealing of an aluminum ingot in sequence to obtain the mirror aluminum material, wherein the annealing temperature in the pre-annealing is 270-290 ℃, and the heat preservation time is 3-8 hours. According to the application, through tightly connecting the three links of pre-annealing, cold rolling and mirror rolling, the effective accumulation of cold deformation energy is realized, and the distribution uniformity of the cube texture in the mirror aluminum material is effectively improved. The mirror aluminum material prepared by the preparation method has high glossiness, high strength and good oxidation resistance, is not easy to have material lines after anodic oxidation, and can effectively inhibit an oxide film obtained by anodic oxidation from generating film cracks after electrophoresis.

Inventors

• GUI XINGHUI
• HUANG RUIYIN
• GONG PING
• GAO CHONG
• GUO HAO
• DENG ZHENZHEN
• ZHANG WENJING
• MA KE
• SONG XIAOYU

Assignees

• 中铝材料应用研究院有限公司
• 中铝西南铝板带有限公司
• 中铝(浙江)汽车轻量化科技有限公司

Dates

Publication Date

20260508

Application Date

20260228

Claims (10)

1. 1. The preparation method of the mirror aluminum material is characterized by comprising the steps of sequentially smelting and semi-continuously casting an aluminum ingot, homogenizing heat treatment, hot rolling, pre-annealing, cold rolling, mirror rolling and finished product annealing to obtain the mirror aluminum material; the annealing temperature in the pre-annealing step is 270-290 ℃, and the heat preservation time is 3-8 hours.
2. 2. The method for producing a mirror-surface aluminum material according to claim 1, wherein in the hot rolling step, a hot start rolling temperature is 440 to 480 ℃ and a hot finish rolling temperature is 250 to 270 ℃; preferably, in the hot rolling step, the hot start rolling temperature is 460-480 ℃, and the hot finish rolling temperature is 250-260 ℃; Preferably, in the hot rolling step, the maximum deformation of a single pass is more than or equal to 50%, and the thickness of a hot rolled plate obtained in the hot rolling step is 4-6 mm; more preferably, in the hot rolling step, the single pass maximum deformation is 55 to 65%.
3. 3. The method for preparing a mirror aluminum material according to claim 1 or 2, wherein the homogenization heat treatment is performed at a temperature of 500-530 ℃ for a heat preservation time of 4-8 hours; preferably, the annealing temperature in the finished product annealing step is 270-300 ℃, and the heat preservation time is 6-8 hours.
4. 4. The method for producing a mirror-surface aluminum material according to any one of claims 1 to 3, wherein the total deformation amount in the cold rolling step is 60 to 80%; Preferably, the total deformation in the cold rolling step is 60-70%.
5. 5. The method for producing a mirror-surface aluminum material according to any one of claims 1 to 4, wherein the number of rolling passes in the mirror-surface rolling step is 3 to 5, and the deformation amount per pass is 10% or less.
6. 6. The method for preparing the mirror aluminum material according to claim 1, wherein the aluminum ingot comprises, by weight, not less than 99.5% of Al, not more than 0.01% of Mg, not more than 0.08% and not more than 0.13% of Fe, not more than 0.01% of Cu, not more than 0.06% and not more than 0.12% of Si, and not more than 0.04% of other impurity elements.
7. 7. A mirror-surface aluminum material, characterized in that the mirror-surface aluminum material is produced by the production method of the mirror-surface aluminum material as claimed in any one of claims 1 to 6.
8. 8. The mirror aluminum material according to claim 7, wherein the average grain size of the mirror aluminum material is 100-140 μm, and the area ratio of the cubic texture in the cross section of the mirror aluminum material is 0.2-5%; Preferably, the glossiness of the mirror aluminum material is more than or equal to 700GU; preferably, the tensile strength of the mirror aluminum material is more than or equal to 120MPa, the yield strength is more than or equal to 80MPa, and the elongation is more than or equal to 16%.
9. 9. Use of the specular aluminum material according to claim 7 or 8, characterized in that the specular aluminum material is used in the field of automotive specular aluminum.
10. 10. A mirror-surface aluminum for a vehicle, characterized in that the mirror-surface aluminum for a vehicle is obtained by polishing, stamping, anodic oxidation and electrophoresis of the mirror-surface aluminum material according to claim 7 or 8 in this order; preferably, the thickness of the mirror aluminum for the vehicle is 13-16 μm.

Description

Preparation method of mirror aluminum material, mirror aluminum material and application Technical Field The application relates to the technical field of aluminum alloy processing, in particular to a preparation method of a mirror surface aluminum material, the mirror surface aluminum material and application. Background In the modern automobile manufacturing industry, the mirror aluminum material is one of the indispensable materials for the inner and outer decorative parts of high-grade automobiles due to the unique high glossiness and excellent corrosion resistance. Wherein, the 1-series mirror aluminum material is prepared by taking 1-series aluminum alloy (namely industrial pure aluminum, the aluminum content is more than or equal to 99%) as a base material, and has better formability, weldability and corrosion resistance. With the rapid development of the automobile industry, the demand for mirror aluminum materials is rapidly increased, and particularly in the field of high-grade automobiles, the quality requirements for the mirror aluminum materials are more severe. However, the existing preparation process of the 1-series mirror-surface aluminum material has more problems, so that the existing preparation process is difficult to meet the experimental standard of the mirror-surface aluminum material for the vehicle. First, anodic oxidation is a commonly used metal surface treatment process that can improve the corrosion and wear resistance of materials while imparting an aesthetically pleasing appearance to the product. After the existing mirror aluminum product is anodized, the surface of the mirror aluminum product is often provided with material grain defects, and the aesthetic degree and the yield of the product are seriously affected. Secondly, the imported mirror aluminum material can successfully prepare an oxide film with the thickness of more than 13 mu m after anodic oxidation treatment, and the integrity of the film layer is maintained after electrophoresis hole sealing, and when the thickness of the oxide film of the mirror aluminum material exceeds 13 mu m, the oxide film is easy to crack after electrophoresis, so that the attractiveness of the material is influenced, and the protection performance and the service life of the material are reduced. Intensive studies have found that the generation of striae is closely related to the aggregation distribution of cubic texture (Cube texture) in a specular aluminum material on its surface. Cube texture is a specific crystal orientation, and its uneven distribution on the alloy surface accelerates the corrosion rate of the area during the anodic oxidation process, and generates roughness difference with the surrounding normal area, so as to form macroscopic color difference, namely so-called grain defect. In addition, the Cube texture with uneven distribution can also lead to uneven thickness of the mirror aluminum material oxide film, so that uneven stress distribution is caused, and the uneven stress distribution can generate stress concentration, so that cracks of the oxide film are induced during electrophoresis. Therefore, the control of the uniform distribution of Cube textures becomes a key for improving the quality of finished products after anodic oxidation and electrophoresis treatment of mirror aluminum materials. Based on the above, how to further optimize the treatment process in the preparation process of the 1-series mirror aluminum material, reduce the duty ratio of Cube texture in the mirror aluminum material, realize the discrete and uniform distribution of Cube texture on the surface of the material, solve the problem that the oxide film with the thickness of more than 13 μm is easy to generate film cracks after electrophoresis, and improve the quality and the overall performance of the finished product of the mirror aluminum material after anodic oxidation and electrophoresis treatment, so as to meet the increasingly high quality requirements of high-grade automobile manufacturing industry on the mirror aluminum material, and become the problem to be solved urgently at present. Disclosure of Invention The application mainly aims to provide a preparation method of a mirror aluminum material, the mirror aluminum material and application thereof, so as to solve the problems of high Cube texture ratio and uneven distribution in the mirror aluminum material in the prior art, and the problems that an oxidized film is easy to have material lines after anodic oxidation and is easy to have film cracks after electrophoresis caused by the Cube texture ratio, and aim to improve the quality and the overall performance of a finished product of the mirror aluminum material after anodic oxidation and electrophoresis, so as to meet the increasing high-quality requirement of high-grade automobile manufacturing industry on the mirror aluminum material. In order to achieve the above purpose, the application provides a preparation method of a