Similarity and difference in roles of chromium and molybdenum in passivating amorphous alloys in concentrated acids

K. Hashimoto, P. Y. Park, J. H. Kim, E. Akiyama, H. Habazaki, A. Kawashima, K. Asami

Research output: Contribution to journalConference article

9 Citations (Scopus)

Abstract

A variety of alloys including Cr-valve metal, Mo-valve metal and Cr-Mo-Ni alloys have been successfully prepared in a single amorphous phase. All these alloys have extremely high corrosion resistance. Besides, because of the formation of a single phase solid solution, these alloys are suitable for study of the role of alloying element in the alloy matrix in enhancing the corrosion resistance. Cr-valve metal alloys form spontaneously passivated double oxyhydroxide films containing both chromic ion and valve metal cation. Cr-Mo-Ni alloys form a passive hydrated chromium oxyhydroxide film. Zr-Mo alloys form a bi-layered passive film of zirconium and molybdenum hydroxide. The difference in the stability of the passive film affects the corrosion resistance and passive film composition, particularly when the stability of the film is high and when the corrosion potential is high.

Original languageEnglish
Pages (from-to)779-788
Number of pages10
JournalMaterials Science Forum
Volume185-188
DOIs
Publication statusPublished - 1995
EventProceedings of the 7th International Symposium on Passivity Passivation of Metals and Semiconductors - Clausthal, Ger
Duration: 1994 Aug 211994 Aug 26

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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