Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Microstructure and Corrosion Properties of Plasma Electrolytic Oxide Coatings on AZ31 Magnesium Matrix Composite

플라즈마 전해 산화 처리한 AZ31 및 Al18B4O33w/AZ31 마그네슘 복합재료 피막의 미세구조 및 부식특성

  • 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)
  • Received : 2010.12.15
  • Published : 2011.03.25
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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.

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