Effect of ceramic anodizing pretreatment on micro-arc oxidation film of 6061 aluminum alloy in weak-acid electrolyte

doi:10.13251/j.issn.0254-6051.2021.03.006

Abstract

Abstract: Taking 6061 aluminum alloy as the research object, the composition and performance of its micro-arc oxidation (MAO) film in weak-acid electrolyte were analyzed, and the influence of ceramic anodizing pretreatment on the MAO film was discussed. The results show that in weak-acid electrolyte, the 6061 aluminum alloy MAO film with ceramic anodizing pretreatment is mainly composed of γ-Al₂O₃ and α-Al₂O₃, while amorphous Al₂O₃ also exists due to the residual ceramic anodizing film. Compared with the non-pretreated MAO film, the ceramic anodizing pretreatment can significantly increase the thickness, hardness and corrosion resistance of the oxidation film, of which the thickness and hardness after the pretreatment are 25.3 μm and 1690 HV0.1, respectively.

Key words: micro-arc oxidation, 6061 aluminum alloy, ceramic anodizing pretreatment

CLC Number:

TG146.21

Wu Yuhao, Wei Xiaowei, Xie Xiaowei. Effect of ceramic anodizing pretreatment on micro-arc oxidation film of 6061 aluminum alloy in weak-acid electrolyte[J]. Heat Treatment of Metals, 2021, 46(3): 28-32.

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