Corrosion behavior of Zr65Al7.5Ni10Cu17.5 Amorphous alloy for biomedical use

S. Hiromoto, Pang Tsai An Pang Tsai, M. Sumita, T. Hanawa

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

To evaluate the performance of Zr65Al7.5Ni10Cu17.5 amorphous alloy for the biomedical use, the effects of chloride ion, Cl-, pH, and dissolved oxygen, DO, on the anodic polarization behavior of the alloy were examined in phosphate buffered solutions. Polarization resistance, Rp, at open-circuit potential, Eopen, and pitting potential, Epit, were determined from the polarization curve. Compositions of passive film generated in a pH-7.5 solution with various concentrations of DO were characterized with X-ray photoelectron spectroscopy. In the solution with pH 7.5, the Epit decreased with the increase in logarithm of Cl- concentration, [Cl-], and showed the highest value with the same DO concentration, [DO], as that in vivo. The concentrations of hydroxide group, [OH-], and phosphate ions, [HxPO4(3-x)-], in the passive film were changed with various [DO]s, and the Epit decreased with the increase in [OH-] and [HxPO4(3-x)-]. In the solution with pH 2.2, the Epit was higher than the Eopen with and without DO. Therefore, this alloy may be resistant to the pitting corrosion in vivo.

Original languageEnglish
Pages (from-to)656-659
Number of pages4
JournalMaterials Transactions
Volume42
Issue number4
DOIs
Publication statusPublished - 2001

Keywords

  • Biomaterials
  • Chloride ion
  • Dissolved oxygen
  • Electrochemical measurement
  • ZrAlNiCu amorphous alloy
  • pH

ASJC Scopus subject areas

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

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