Environment-friendly die-casting aluminum alloy anode oxide film and environment-friendly preparation process thereof

Abstract

The invention discloses an environment-friendly die-casting aluminum alloy anode oxide film and an environment-friendly preparation process thereof. The environment-friendly die-casting aluminum alloyanode oxide film comprises die-casting aluminum alloy used for anodic oxidation, and the die-casting aluminum alloy comprises 3.0 wt%-6.0 wt% of Mg, 2.5 wt%-4.5 wt% of Zn, 1.0 wt%-2.5 wt% of Si, 0.5wt%-1.0 wt% of Mn, 0.3 wt%-0.8 wt% of Cr and the balance Al. The preparation method of the die-casting aluminum alloy comprises the following steps that 1, the raw materials comprising 3.0 wt%-6.0 wt%of Mg, 2.5 wt%-4.5 wt% of Zn, 1.0 wt%-2.5 wt% of Si, 0.5 wt%-1.0 wt% of Mn, 0.3 wt%-0.8 wt% of Cr and the balance Al are weighed and melt. The strength of the oxide film can be remarkably improved through a post-treatment process of firstly heat-sealing and then cold-sealing the oxide film, and in the preparation process of the die-casting aluminum alloy, molten metal is refined and matched withthe post-treatment process, so that the surface microstructure of the oxide film can be improved, cracks are reduced, and therefore, during heating, non-uniform thermal stress is prevented from beinggenerated in an oxide film layer, and cracking of the film layer is avoided.

Description

technical field [0001] The invention relates to an aluminum alloy anodized film, in particular to an environment-friendly die-casting aluminum alloy anodized film and an environment-friendly preparation process thereof. Background technique [0002] In order to overcome the defects of aluminum alloy surface hardness, wear resistance, etc., expand the scope of application, and prolong the service life, surface treatment technology has become an indispensable part of the use of aluminum alloys, and anodizing technology is the most widely used and most successful , Anodizing refers to the electrochemical oxidation of metals or alloys. The process of forming an oxide film on an aluminum product (anode) under the corresponding electrolyte and specific process conditions of aluminum and its alloys under the action of an applied current. Anodic oxidation, if not specified, usually refers to the sulfuric acid anode oxidation. [0003] In the existing preparation process, the non-a...

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Problems solved by technology

[0003] In the existing preparation process, the non-aluminum elements contained in the die-casting aluminum alloy will lead to a decrease in the quality of the oxide film, insufficient strength, and cracks on the surface of the oxide film during the anodic oxidation process. In the subsequent use process, if the ambient temperature is too high , will lead to uneven thermal stress in the oxide layer, causing cracking of the film layer, which needs to be improved