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Preparation Of Composite Coating On Az91d Magnesium Alloy By Silica Sol-Micro-Arc Oxidation

Author

Listed:
  • ZHONGCAI SHAO

    (School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, P. R. China)

  • FEIFEI ZHANG

    (School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, P. R. China)

  • RUIQIANG ZHAO

    (School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, P. R. China)

  • XIAOYI SHEN

    (#x2020;School of Metallurgy, Northeastern University, Shenyang 110004, P. R. China)

Abstract

Composite coating was prepared on AZ91D magnesium alloy with a new method which combined silica sol with micro-arc oxidation (MAO). The MAO coating was prepared on the basis of MAO solution, and then coated by sol–gel process. The composite coating was obtained after second MAO treatment. Scanning electron microscopy coupled with X-ray diffraction (XRD), energy spectrum analysis and electrochemical testing was applied to characterize the properties of MAO coating and composite coating. The experimental test results indicated that the Si element derived from SiO2 gel particle embedded into the MAO coating by second MAO treatment. The surface of composite coating became dense and the holes were smaller with silica sol sealing process. The corrosion resistance of composite coating was improved than the MAO coating.

Suggested Citation

  • Zhongcai Shao & Feifei Zhang & Ruiqiang Zhao & Xiaoyi Shen, 2016. "Preparation Of Composite Coating On Az91d Magnesium Alloy By Silica Sol-Micro-Arc Oxidation," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 23(04), pages 1-6, August.
    • Handle: RePEc:wsi:srlxxx:v:23:y:2016:i:04:n:s0218625x16500293
    DOI: 10.1142/S0218625X16500293
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