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

고재황 (성균관대학교 신소재공학과)
권식철 (한국기계연구원 표면연구부)
장도연 (한국기계연구원 표면연구부)
이동복 (성균관대학교 신소재공학과)
Publication Information
Journal of the Korean institute of surface engineering / v.36, no.6, 2003 , pp. 430-436 More about this Journal
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
Ni-W electrodeposition; Oxidation;
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