Heat-resisting alloys of stainless 304 steel, Incoloy 825 and Inconel 625 alloys were coated with Pt and Ir films by metalorganic chemical vapor deposition (MOCVD). Corrosion behavior of these materials was investigated by thermogravimetry in a Br2-O2 atmosphere at 1073 K. By coating Pt films, the mass gain during the corrosion was significantly reduced, and almost no morphological change of the film surface was observed after the corrosion. Alloy elements (Ni, Cr, Fe) diffused into Pt films with forming pores at the Pt/alloy substrate interface. The corrosion resistance of Ir coating was slightly higher than that of Pt coating except that on stainless 304 steel. A difference of thermal expansion between Ir film and stainless 304 steel caused many cracks at the Ir/alloy substrate interface. No inter-diffusion between Ir and alloy elements were observed.
|ジャーナル||Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals|
|出版ステータス||Published - 1999|
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