Surface treatment method of die-cast aluminum alloy exterior part and die-cast aluminum alloy exterior part product

Abstract

The invention provides a surface treatment method for a die-casting aluminum alloy exterior part and a die-casting aluminum alloy exterior part product. The surface treatment method comprises: using aluminum as an anode, using the die-casting aluminum alloy exterior part as a cathode, and performing the die-casting aluminum alloy exterior part on the die-casting aluminum alloy exterior part. Ion plating treatment is performed to form an aluminum coating layer on the surface of the die-casting aluminum alloy exterior parts; anodizing treatment is performed on the die-casting aluminum alloy exterior parts after the ion plating treatment to form an oxide film layer on the surface of the die-casting aluminum alloy exterior parts. In the surface treatment method for die-casting aluminum alloy exterior parts provided by the present invention, an aluminum coating layer is formed on the surface of the exterior parts before anodizing treatment. The anodic oxidation effect and the subsequent dyeing effect are guaranteed, and the process is simple, the cost is low, and the authenticity rate of the appearance parts is high.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, and more specifically, to a surface treatment method of a die-casting aluminum alloy appearance part and a die-casting aluminum alloy appearance part product. Background technique [0002] At present, the surface treatment of die-casting aluminum alloy appearance parts cannot be carried out by anodic oxidation process, but can only be sprayed and baked. If anodic oxidation treatment of aluminum alloy appearance parts is to be carried out, the forming process can only be stamped first and then CNC (numerical control machine tool) Processing, first forging and then CNC processing or full sheet CNC processing. Among them, the method of spraying baking paint is specifically to use a special primer on the substrate layer to improve the adhesion, and then spray the primer twice and the middle paint once and then the PU topcoat (polyurethane coating) once, after each spraying. Baking, t...

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Problems solved by technology

[0002] At present, the surface treatment of die-casting aluminum alloy appearance parts cannot be carried out by anodic oxidation process, but can only be sprayed and baked. If anodic oxidation treatment of aluminum alloy appearance parts is to be carried out, the forming process can only be stamped first and then CNC (numerical control machine tool) Processing, first forging and then CNC processing or full sheet CNC processing

Among them, the method of spraying baking paint is specifically to use a special primer on the substrate layer to improve the adhesion, and then spray the primer twice and the middle paint once and then the PU topcoat (polyurethane coating) once, after each spraying. Baking, that is, five-coating and five-baking process, the treatment effect is poor, and the effect of anodizing treatment cannot be achieved, such as high metallic luster and cold feel, etc. At the same time, the cumbersome five-coating and five-baking process is time-consuming and laborious. Offset the cost advantage of the die-casting process; at the current stage, the method of stamping first and then CNC processing, forging first and then CNC processing, or full sheet CNC processing has low process yield and high cost, which has become a bottleneck for reducing the cost of mobile phones

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