Effect of pH on the polarization behavior of Zr65Al7.5Ni10Cu17.5 amorphous alloy in a phosphate-buffered solution

S. Hiromoto, A. P. Tsai, M. Sumita, T. Hanawa

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

For the biomedical use of amorphous alloys, the effect of pH on the polarization behavior of Zr65Al7.5Ni10Cu17.5 amorphous alloy was evaluated in phosphate-buffered solutions with and without chloride ion. In the solution without chloride ion, the corrosion resistance at open-circuit potential decreased with a decrease in pH. The open-circuit potential was ennobled with a decrease in pH by the acceleration of a cathodic reaction. However, the open-circuit potential was not changed by chloride ion, and the pitting potential was not changed with the decrease in pH. Then, the open-circuit potential was always less noble than the pitting potential. Therefore, the pitting-corrosion resistance of the zirconium-based amorphous alloy decreases with a decrease in pH due to the shift of the open-circuit potential. However, pitting corrosion does not occur spontaneously with a decrease in pH. (C) 2000 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)2193-2200
Number of pages8
JournalCorrosion Science
Volume42
Issue number12
DOIs
Publication statusPublished - 2000 Dec

Keywords

  • Biomaterial
  • Polarization
  • Zirconium-based amorphous alloy
  • pH

ASJC Scopus subject areas

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

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