Surface treatment method for aluminum alloys

Abstract

The invention provides a surface treatment method for aluminum alloys. The surface treatment method for the aluminum alloys comprises the following steps: carrying out surface oxidization on aluminum alloy workpieces by using sulfuric acid to form porous type aluminum oxide films on the surfaces of the oxidized aluminum alloys; dyeing the aluminum oxide films for at least two times in a manner of curing and protecting with combination of photo-sensitive and ultraviolet light, so that the aluminum oxide films has at least two colors; and sealing the dyed aluminum oxide films. According to the surface treatment method for the aluminum alloys, the aluminum oxide films are dyed for at least two times by the manner of curing and protecting with combination of photo-sensitive and ultraviolet light, so that the aluminum oxide films has at least two colors; the method has no requirement on the colors dyed for at least two times; the photo-sensitive dyeing is two-color or even multi-color; the pattern effect has the irreplaceable specificity; the appearance effect of the surfaces of the aluminum alloys is further effectively improved; compared with the prior art, the method can be used for effectively avoiding the defect of the corrosion of the sulfuric acid solution subjected to secondary anodic oxidation to film layers subjected to primary oxidization; the method is relatively high in reliability and stability in implementation.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy treatment technology, in particular to an aluminum alloy surface treatment method. Background technique [0002] The oxide film produced by surface treatment of aluminum and its alloys has decorative effects, protective properties and special functions, which can improve the electrical conductivity, heat conduction, wear resistance, corrosion resistance and optical properties of aluminum and its alloys. Therefore, researchers at home and abroad use various methods to surface treat it to improve its comprehensive performance, and have made great progress. [0003] Anodizing is the most commonly used surface treatment process for aluminum alloys. The surface of the aluminum alloy can be dyed by anodizing the surface of the aluminum alloy to meet the needs of aluminum alloy devices with various surface colors. The traditional aluminum alloy anodic oxidation dyeing method is relatively simple...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for surface treatment of aluminum alloys, which is used to overcome the defects of certain limitations on the oxidation color and poor stability caused by the two-color oxidation process in the prior art, and can dye at least two colors on the surface of aluminum alloys , and there is no limitation on the color; and the realization stability is very good

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