The degradation of the corrosion resistance of sputter-deposited chromium-titanium alloys by nanoscale heterogeneity

M. Mehmood, Eiji Akiyama, H. Habazaki, A. Kawashima, K. Asami, K. Hashimoto

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The effect of heat treatment, inducing the formation of nanocrystalline two phase alloys on the corrosion resistance of sputter-deposited Cr-Ti alloys containing 22, 48, 60, and 72 at.% titanium has been studied in 6 M HCl. The as-deposited homogeneous Cr-Ti alloys are spontaneously passive in 6 M HCl, except Cr-72Ti alloy, although both chromium and titanium metals undergo active dissolution in this environment. The air-formed surface films on the alloys containing sufficient amounts of both chromium and titanium are highly protective, being responsible for spontaneous passivation. The heat treatment of the alloys leading to the formation of hcp titanium or bcc chromium with a grain size of 20-25 nm as well as Cr2Ti is detrimental for the high corrosion resistance of these alloys. However, when Cr2Ti and bcc solid solution of titanium containing ~14 at.% chromium are formed, the high corrosion resistance of the as-deposited alloys is sustained. The high corrosion resistance of the sputter-deposited Cr-Ti alloys is largely reduced by the formation of less corrosion-resistant hcp titanium or bcc chromium phases, but is maintained when only the phases containing certain amounts of both elements are formed by heat treatment.

Original languageEnglish
Pages (from-to)1871-1890
Number of pages20
JournalCorrosion Science
Volume41
Issue number9
DOIs
Publication statusPublished - 1999 Aug 1

Keywords

  • AFM
  • Alloy
  • Passivity
  • Sputtered films
  • Titanium

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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