Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effects of Hydration Treatments on the Phase Transition of Anodic Aluminum Oxide Layers

알루미늄 양극산화 피막의 상전이에 미치는 수화처리의 영향

  • Joo, E.K. (School of Advanced Materials Engineering, Kookmin University) ;
  • Kim, S.S. (Samyoung Electronics Co. Ltd.) ;
  • Oh, H.J. (Dept. of Materials Engiheering, Hanseo University) ;
  • Cho, S.H. (School of Advanced Materials Engineering, Kookmin University) ;
  • Chi, C.S. (School of Advanced Materials Engineering, Kookmin University)
  • 주은균 (국민대학교 신소재공학부) ;
  • 김성수 (삼영전자공업(주)) ;
  • 오한준 (한서대학교 재료공학과) ;
  • 조수행 (국민대학교 금속재료공학부) ;
  • 지충수 (국민대학교 금속재료공학부)
  • Published : 2002.07.01
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Abstract

Hydration treatments were performed on the pure aluminum substrate at $100^{\circ}C$ followed by anodizing and heat treatments on the layers. The transformation behaviors of the oxide layers according to the hydration treatment were studied using TEM, XRD, RBS etc. Above $90^{\circ}C$ the hydrous oxide film could be formed, which were turned out to be hydrous oxides(AlOOH $nH_2$O). The anodization on the hydrous oxide film was more effective for the transition of amorphous anodic oxides to the crystalline $\Upsilon-Al_2$ $O_3$ comparing with the case for anodizing on the aluminum substrate without hydration treatment And additional heat treatments were also helpful for the acceleration of the transformation of the hydrous oxide to $\Upsilon-Al_2$ $O_3$. During the heat treatment the interface between $\Upsilon-Al_2$ $O_3$and the hydrous oxide layers migrated to the outer side of hydrous layer.

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