Microstructure and Corrosion Resistance of Anodized Mg-9 mass%Li-1 mass%Zn Alloy

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  • Wang Jian-Yih
    Department of Materials Science and Engineering, National Dong Hwa University
  • Liu Chung-Ming
    Department of Chemical and Materials Engineering Lunghwa University of Science and Technology
  • Chen Wei-Kun
    Graduate School of Defense Science, Chung Cheng Institute of Technology, National Defense University
  • Liu Yih-Ming
    Department of Applied Chemistry & Materials Science, Chung Cheng Institute of Technology, National Defense University
  • Ger Ming-Der
    Department of Applied Chemistry & Materials Science, Chung Cheng Institute of Technology, National Defense University

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This research used pulse and direct current methods to perform surface anodizing treatment of Mg-9 mass%Li-1 mass%Zn alloy (LZ91). The anodic films were analyzed with electrochemical impedance spectroscopy (EIS) for corrosion resistance. The impedance measurements show that the resistance value of anodic films made by pulse current to be 100 KΩ at 2×10−2 A/m2 and those made by direct current anodic films to be 65 KΩ at 2×10−2 A/m2. It reveals that pulse current makes better anodic films than direct current. There were two layers in the anodic films that were verified from the EIS phase angle diagram in which three time constants existed. The structure of the film was analyzed by a FE-SEM, and the microstructure observation showed that the anodic film consists of porous and barrier layers.

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