Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
권호 표지

High Temperature Oxidation Behavior of Ni-W Coatings Electrodeposited on Steel

강기판 위에 코팅된 Ni-W의 고온산화거동

  • 고재황 (성균관대학교 신소재공학과) ;
  • 권식철 (한국기계연구원 표면연구부) ;
  • 장도연 (한국기계연구원 표면연구부) ;
  • 이동복 (성균관대학교 신소재공학과)
  • Published : 2003.12.01
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Abstract

The nanoocrystalline Ni-l5W(at.%) coating electrodeposited on the high carbon steel was oxidized at 700 and $800^{\circ}C$ in air, and the resultant oxidation properties were investigated using XRD, EPMA, TGA and TEM. The oxidation resistance of the coating was not so good that most of the coating was oxidized after oxidation at $800^{\circ}C$ for 5 hrs. The oxidation led to the formation of the outer, thin NiO oxide scale and the inner, porous, rather thick ($NiWO_4$＋NiO) mixed layer containing a bit of $WO_2$. During oxidation, substrate elements such as Fe and Cr diffused outwardly toward the coating, according to the concentration gradient.

Keywords

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