Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Characteristic Evaluation of Anodic Film Depending on the Concentration of Sodium Silicate in the Electrolyte Anodized AZ31B Magnesium Alloy

전해액 중 Sodium silicate의 농도에 따라 양극 산화된 AZ31B 마그네슘 합금 양극 피막의 특성 평가

  • Lee, Dong-Kil (Department of Materials Science and Engineering, Pusan National University) ;
  • Kim, Yong-Hwan (Department of Materials Science and Engineering, Pusan National University) ;
  • Park, Hyun (Advanced Ship Engineering Research Center, Pusan National University) ;
  • Jung, Uoo-Chang (Dongnam Technology Service Division, Korea Institute of Industrial Technology) ;
  • Chung, Won-Sub (Department of Materials Science and Engineering, Pusan National University)
  • 이동길 (부산대학교 재료공학과) ;
  • 김용환 (부산대학교 재료공학과) ;
  • 박현 (부산대학교 첨단 조선공학 연구센터) ;
  • 정우창 (한국생산기술연구원) ;
  • 정원섭 (부산대학교 재료공학과)
  • Published : 2009.06.30
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Abstract

Magnesium is one of the lightest metals, and magnesium alloys have excellent physical and mechanical properties such as high stiffness/weight ratios, good castability, good vibration and shock absorption. However their poor corrosion resistance, wear resistance, hardness and so on, have limited their application. To improve these defects, many techniques are developed. Micro arc oxidation(MAO) is a one of the surface treatments under anodic oxidation in which ceramic coating is directly formed on the surface of magnesium alloy. In this study, the characteristics of anodic film were examined after coating the AZ31B magnesium alloy through the MAO process. MAO was carried out in potassium hydroxide, potassium fluoride, and various concentration of sodium silicate in electrolyte. The morphology and chemical composition of the coating layer were characterized by SEM, XRD, EPMA and EDS. The hardness of anodic films was measured by micro-vickers hardness tester. As a result, the morphology and composition of anodic film were changed by concentration of sodium silicate. Thickness and Si composition of anodic film was increased with increasing concentration of sodium silicate in electrolyte. The hardness of anodic film was highly increased when the concentration of sodium silicate was above 40 g/l in electrolyte.

Keywords

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