Recent progress in corrosion-resistant new alloys prepared by sputter deposition

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

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Tailoring corrosion-resistant new alloys has recently been performed mostly by sputter deposition technique. This technique is suitable to form a single phase solid solution even when the boiling point of a component is lower than the melting point of the rest of components and/or when a component is immiscible to another component in the liquid state. Sputterdeposited chromium alloys with valve metals, such as titanium, zirconium, niobium and tantalum are composed of amorphous single phase in wide composition ranges. Molybdenum-valve metal alloys consist mostly of fine-grained bcc single phases. These alloys have very high corrosion resistance in concentrated hydrochloric acids which is higher than that of alloy constituting elements. The corrosion resistance increases with increasing chromium content of chromium-valve metal alloys, while the corrosion resistance decreases with increasing molybdenum content of molybdenum-valve metal alloys. Their corrosion resistance is based on spontaneous passivation. The passive films formed on amorphous chromium-valve metal alloys consist of double oxyhydroxides of chromic ion and valve metal cations. The passive films formed on molybdenum-valve metal alloys are heterogeneous. The exterior of the films is rich in valve metal cations and the interior is rich in letra valent molybdenum.

Original languageEnglish
Pages (from-to)99-105
Number of pages7
JournalScience Reports of the Rerearch Institutes Tohoku University Series A-Physics
Volume42
Issue number1
Publication statusPublished - 1996 Mar 1

Keywords

  • Chromium-refractory metal alloy
  • Corrosion resistance
  • Molybdenum-refractory metal alloy
  • Passivity

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys

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