PREPARATION OF GRAYISH BLACK FILM ON AM50 MAGNESIUM ALLOY BY CHEMICAL CONVERSION–MICRO-ARC OXIDATION

Zhongcai Shao, Feifei Zhang, Qingfang Zhang, Li Yang and Xiaoyi Shen
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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
Qingfang Zhang: School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, P. R. China
Li Yang: 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

Surface Review and Letters (SRL), 2017, vol. 24, issue 01, 1-8

Abstract: The grayish black film was prepared on AM50 magnesium alloy with a new method which combined chemical conversion with micro-arc oxidation (MAO). The optimum formula of chemical conversion was obtained by L9(34) orthogonal test. Meanwhile, the morphology, structure, composition and corrosion resistance of films were analyzed by scanning electron microscopy (SEM), energy spectrum analysis (energy dispersive X-ray spectroscopy (EDS)), X-ray diffraction (XRD), electrochemical tests and CuSO4 drip experiment. The results indicated that Mo element was introduced into the MAO film by chemical conversion pretreatment. The surface of composite film was smooth and compact. The main phase composition of the composite film were SiO2, Mo9O26, MgSiO3, Mg2SiO4 and Mo9O26 was identified to be responsible for giving color to the film. The corrosion resistance of the grayish black film was improved obviously.

Keywords: Magnesium alloy; grayish black film; chemical conversion; micro-arc oxidation (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17500123

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