The effect of heat treatment on the corrosion behavior of sputter-deposited aluminum-chromium alloys

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

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The effect of heat treatment on the corrosion resistance of sputter-deposited aluminum-chromium alloys containing 16-51 at% chromium has been studied in 0.1 and 0.5 M HCl. Structural relaxation decreases the corrosion rate of Al-16Cr alloy on which the passive film cannot be formed, since the corrosion rate is controlled by the reactivity of the alloy surface. The corrosion rate of spontaneously passive Al-35Cr alloy increases by crystallization. The chromium enrichment of the matrix, as a result of precipitation of a nanocrystalline aluminum-rich phase, results in enhancement of the corrosion resistance. However, if the size of the less corrosion-resistant aluminum-rich grains exceeds a critical limit of approximately 20 nm, the corrosion resistance decreases.

Original languageEnglish
Pages (from-to)477-499
Number of pages23
JournalCorrosion Science
Volume41
Issue number3
DOIs
Publication statusPublished - 1998 Mar 1

Keywords

  • AFM
  • Alloy
  • Aluminum
  • Passive films
  • Pitting corrosion

ASJC Scopus subject areas

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

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