Method for processing anode of aluminum or aluminum alloy surface

Abstract

The invention relates to method for processing the anode of an aluminum or aluminum alloy surface, comprising the following steps: providing an aluminum or aluminum alloy base body which comprises aninner surface and an outer surface opposite to the inner surface; carrying out first machining processing on the outer surface of the aluminum or aluminum alloy base body so that the outer surface hasfirst machining surface effect; carrying out first-time anode processing on the aluminum or aluminum alloy base body so that the surface of the aluminum or aluminum alloy base body forms an oxidationfilm with a first color; removing a part or all of the oxidation film formed on the inner surface of the aluminum or aluminum alloy base body so that the aluminum or aluminum alloy base body is conductive; carrying out second machining processing on the outer surface of the aluminum or aluminum alloy base body; removing a part of the oxidation film positioned on the outer surface and enabling anarea the oxidation film of which is removed to have second machining surface effect; and carrying out second-time anode processing for the aluminum or aluminum alloy base body so that the area which has the second machining surface effect forms an oxidation film with a second color. The method can obtain different surface effects on a same base body.

Description

technical field [0001] The invention relates to an anodic treatment method for the surface of aluminum or aluminum alloy. Background technique [0002] In order to adapt to the development trend of consumers paying attention to metal texture, high-grade products of 3C products such as computers, communications, and consumer electronics are gradually using metal casings as the mainstream. Metal materials have the advantages of good electromagnetic shielding effect, good heat dissipation, good rigidity, impact resistance, etc., and also have the environmental protection characteristics of recyclability. [0003] Aluminum and its alloys have the advantages of light weight, fast heat dissipation, and beautiful appearance, and can be treated with glossy or matte surface according to requirements, so they are very suitable for the production of metal casings and their surface patterns. In application, an oxide film is often formed on the surface through anodic treatment. This oxi...

AI Technical Summary

Problems solved by technology

The existing anodic treatment processes for obtaining oxide films of different colors on the surface of metal casings are realized by multiple anodic treatments and multiple colorings, wherein after each anodic treatment, the area to be anodized next time must be masked. Although this method can obtain a multi-color oxide film on the metal surface, the process is relatively complicated, and the design cost is relatively high because of the need to design a jig for shielding

At the same time, this method is difficult to make high-precision decorative patterns

Moreover, the oxide film obtained by this method lacks a three-dimensional effect, and it is difficult to obtain different surface effects on the same metal substrate.