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http://dx.doi.org/10.3365/KJMM.2011.49.3.270

Microstructure and Corrosion Properties of Plasma Electrolytic Oxide Coatings on AZ31 Magnesium Matrix Composite  

Cheon, Jinho (Technology Center, Doosan Engine)
Park, Yongho (School of Materials Science and Engineering, Pusan National University)
Park, Ikmin (School of Materials Science and Engineering, Pusan National University)
Publication Information
Korean Journal of Metals and Materials / v.49, no.3, 2011 , pp. 270-274 More about this Journal
Abstract
Plasma electrolytic oxidation (PEO) treatment was performed on squeeze cast AZ31 alloy and $Al_{18}B_4O_{33}w/AZ31$ composite. Scanning electron microscope (SEM) was employed to characterize the surface morphology and cross-section microstructure of the coating. The phase structures of the PEO coating were analyzed by X-ray diffraction (XRD). The corrosion resistance of the PEO coating was evaluated by electrochemical method. The results showed that the $Al_{18}B_4O_{33}$ whisker on the surface of the composite was decomposed and $MgAl_2O_4$ was formed in the PEO coating layer of $Al_{18}B_4O_{33}w/AZ31$ composite during PEO treatment. As a result, the electrochemical corrosion potential of the PEO coated $Al_{18}B_4O_{33}w/AZ31$ composite was increased compared with that of AZ31 alloy.
Keywords
plasma electrolytic oxidation(PEO); $Al_{18}B_4O_{33}/AZ31$ composite; corrosion resistance;
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