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《Materials Protection》 2006-02
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Microstructures and Anticorrosion Behavior of Anodic Oxidized Coating on Al Alloy

HE Chun-lin,YU Wen-xin,WANG Jian-ming,CAI Qing-kui(Department of Materials Science and Engineering,Shenyang University,Shenyang 110044,China)  
Anodic oxidation coating was prepared on 2024 Al alloy making use of anodic oxidation in sulfuric acid.The corrosion resistance of the resulting anodized 2024 Al in 3.5% NaCl aqueous solution was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy.The morphology and microstructure of the coating were analyzed using optical microscopy,scanning electron microscopy,and transmittance electron microscopy.Results showed that the anodized coating on the 2024 Al alloy surface had excellent anticorrosion behavior in the aqueous solution containing 3.5% NaCl,namely,the corrosion rate of the anodized 2024 Al was lower than that of the untreated matrix by more than 2 orders of magnitude.The anodized coating was smooth and contained uniformly distributed pores of a size about 10~30 nm.
【Fund】: 辽宁省科技攻关计划资助项目(2004221010)
【CateGory Index】: TG174.451
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