Surface treatment method for die-cast aluminum alloy

Abstract

The invention discloses a surface treatment method for a die-cast aluminum alloy, and relates to the technical field of metal surface treatment. The surface treatment method comprises the following steps: S10, conducting polishing treatment on the die-cast aluminum alloy; S20, conducting sand-blast treatment on the polished die-cast aluminum alloy; S30, conducting anode oxidation treatment on the sand-blasted die-cast aluminum alloy, so that an oxidation film layer is formed in the surface of the sand-blasted die-cast aluminum alloy; S40, conducting dyeing treatment on the oxidized die-cast aluminum alloy; S50, conducting plugging treatment on the dyed die-cast aluminum alloy. According to the surface treatment method, the problems that the die-cast metal structure is non-uniform, black spots are easy to generate, and the anode oxidation treatment cannot be conducted because the conventional die-cast aluminum alloy contains metal ingredients such as silicon, copper and iron are solved, and die-cast aluminum alloy products with various metal appearance effects can be obtained.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a method for surface treatment of a die-casting aluminum alloy. Background technique [0002] Anodizing is a process in which aluminum and its alloys form an oxide film on aluminum products (anodes) under the corresponding electrolyte and specific process conditions under the action of an applied current. It is a mature surface treatment technology. At present, the anodic oxidation treatment seen on the market is mostly used in aluminum alloy plate products, and aluminum die-casting parts have been widely used recently, such as radiators and automobile fasteners. However, due to the copper, copper, and Metal components such as silicon and iron make the die-casting metal structure inhomogeneous, and are prone to blackening or black spots that cannot be anodized, which affects the diversity of metal appearance of die-casting aluminum alloys. [0003] Based on the a...

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Problems solved by technology

[0004] The object of the present invention is to propose a surface treatment method for die-casting aluminum alloys, which solves the problem that the existing die-casting aluminum alloys contain silicon, copper, iron and other metal components that make the die-casting metal structure inhomogeneous and prone to The problem of black spots and inability to carry out anodic oxidation treatment can be obtained by die-casting aluminum alloy products with various metal appearance effects

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