High-temperature corrosion of platinum and iridium coated heat-resistant alloys in a Br2-O2 atmosphere

Takashi Goto, Takuya Sasaki, Toshio Hirai

研究成果: Article査読

1 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)454-460
ページ数7
ジャーナルNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
63
4
DOI
出版ステータスPublished - 1999

ASJC Scopus subject areas

  • 凝縮系物理学
  • 材料力学
  • 金属および合金
  • 材料化学

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