Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Surface Modification of High Si Content Al Alloy by Plasma Electrolytic Oxidation

플라즈마 전해 산화 공정을 이용한 고 실리콘 알루미늄 합금의 표면 산화막 형성

  • Kim, Yong Min (Department of Metallurgy and Materials Science, Hanyang University) ;
  • Hwang, Duck Young (Department of Metallurgy and Materials Science, Hanyang University) ;
  • Lee, Chul Won (Department of Metallurgy and Materials Science, Hanyang University) ;
  • Yoo, Bongyoung (Department of Metallurgy and Materials Science, Hanyang University) ;
  • Shin, Dong Hyuk (Department of Metallurgy and Materials Science, Hanyang University)
  • 김용민 (한양대학교 금속재료공학과) ;
  • 황덕영 (한양대학교 금속재료공학과) ;
  • 이철원 (한양대학교 금속재료공학과) ;
  • 유봉영 (한양대학교 금속재료공학과) ;
  • 신동혁 (한양대학교 금속재료공학과)
  • Received : 2009.07.15
  • Published : 2010.01.20
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Abstract

This study investigated how the surface of Al-12wt.%Si alloy modified by the plasma electrolytic oxidation process (PEO). The PEO process was performed in an electrolyte with sodium hexametaphsphate as a conducting salt, and the effect of ammonium metavanadate on variations in the morphology of electrochemically generated oxide layers on the alloy surface was investigated. It is difficult to form a uniform passive oxide layer on Al alloys with a high Si content due to the differences in the oxidation behavior of the silicon-rich phase and the aluminum-rich phase. The oxide layer covered the entire surface of the Al-12WT.%Si alloy uniformly when ammonium metavanadate was added to the electrolyte. The oxide layer was confirmed as a mixture of $V_2O_3$ and $V_2O_5$ by XPS analysis. In addition, the oxide layer obtained by the PEO process with ammonium metavanadate exhibited a black color. Application of this surface modification method is expected to solve the problem of the lack of uniformity in the coloring of oxide layeres caused by different oxidation behaviors during a surface treatment.

Keywords

Acknowledgement

Supported by : 한국연구재단

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