2024 ALUMINUM OXIDE FILMS PREPARED BY THE INNOVATIVE AND ENVIRONMENT-FRIENDLY OXIDATION TECHNOLOGY

Yundan Yu, Hongliang Ge, Guoying Wei, Li Jiang and Dong Zhang
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Yundan Yu: College of Materials Science and Engineering, China Jiliang University, Hangzhou, P. R. China
Hongliang Ge: #x2020;Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, P. R. China
Guoying Wei: College of Materials Science and Engineering, China Jiliang University, Hangzhou, P. R. China
Li Jiang: College of Materials Science and Engineering, China Jiliang University, Hangzhou, P. R. China
Dong Zhang: #x2020;Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, P. R. China

Surface Review and Letters (SRL), 2020, vol. 27, issue 12, 1-7

Abstract: A kind of environment-friendly anodic oxidation technology was used to oxidize 2024 aluminum alloys from mixed acid solutions to effectively improve the anticorrosion and mechanical performances. The influences of anode oxidation method on surface morphology, microstructure, composition, electrochemistry parameter, anticorrosion property were studied. Aluminum alloy oxidation is actually a dynamic equilibrium process of the formation and dissolution of oxide film which is composed of porous and non-porous layer. With the treatment of anodic oxidation, α-Al2O3 and γ-Al2O3 structures were obtained on the surface of aluminum alloys, which contributed directly to the increase of anticorrosion performance. The potassium dichromate solution was used to seal the surface of oxide films to further improve the anticorrosion property. The oxide films sealed with potassium dichromate were covered with leaf-like structures resulting in larger corrosion resistance that attributed directly to the decrease of corrosion current.

Keywords: Aluminum alloys; anodic oxidation; anticorrosion resistance (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X20500201

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