Preparation method of aluminum or aluminum alloy material with high pore density

Abstract

The invention provides a preparation method of aluminum or an aluminum alloy material with high pore density. The method mainly comprises the following steps: polishing mechanically, degreasing chemically, obtaining anodic oxidation mesopores through anodic oxidation, covering an anti-corrosion coating on a surface, carving a groove by using laser to expose aluminum or aluminum alloy metal, and enabling a part, which is exposed out of the aluminum or aluminum alloy metal, to be subjected to electrochemical corrosion, freezing and drying, chemical corrosion and thermal treatment. The whole preparation method is simple in process, efficient and high in cost performance, and the pore density of the surface of obtained aluminum or aluminum alloy is as high as 108-1010 pores / cm<2>.

Description

technical field [0001] The invention relates to the field of metal surface treatment, and relates to an aluminum and aluminum alloy surface treatment method to obtain a high-pore-density aluminum or aluminum alloy metal base material, and a method for nanometer injection molding on the metal surface. Background technique [0002] Japan's Taiseiplas Co., Ltd. invented nano-molding technology (NMT) in 2002. This technology is a nano-molding technology that integrates metal and plastic. It can integrate metal and resin into molding. It is widely used in thin and light. On the casing of portable mobile electronic products, such as computer terminals and mobile phones. [0003] In the current technology, the treatment process of NMT includes the following process: the metals to be combined are treated with lye, acid, weak acid of ester acid, washed with water, dried and injected. After the metal surface is treated, countless micropores with a diameter of about 20nm will be forme...

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Problems solved by technology

Although ordered micron-scale pores are obtained, the following problems are still faced: (1) the corrosion-resistant sputtering metal cannot be effectively removed, which will affect the binding force and later stability; (2) the template preparation is difficult and the equipment cost is relatively high. High; (3) The process is cumbersome and restricts the operation

[0007] In addition, heat treatment is also used in the prior art to remove moisture in the oxide film in order to improve the long-term stability between the resin and the nanopores, such as the surface-treated aluminum material disclosed by UACJ Hasegawa Shinichi and its manufacturing method and the Surface-treated aluminum / resin layer joint (CN106460221A), heat-treated so that the moisture contained in the oxide film is 10 μg / cm 2 (i.e. 100mg / m 2 ) below, the heat treatment method: the time from the end of the AC electrolytic treatment until the surface temperature of the aluminum material with an oxide film formed in an atmosphere exceeding 150 °C reaches 150 °C within 24 hours, which is not effective Remove the moisture in the oxide film, and the moisture in the oxide film is actually higher than 10μg / cm 2 , that is, the method of removing moisture in the oxidation channel through heat treatment in the prior art still needs to be improved. Based on this content, the present invention provides an improved heat treatment method, and uses it in the field of macroporous-mesoporous corrosion pore nano-injection molding

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