Surface characterization of Ni-Ti alloy modified by isothermal oxidation

Hirokatsu Sugawara, Hirotake Goto, Jun Komotori

Research output: Contribution to journalArticlepeer-review

Abstract

In order to improve the corrosion resistance of Ni-Ti alloys, mechanically polished Ni-Ti alloys discs were subjected to isothermal oxidation (TO) treatment in N2-20vol.%O2 at temperatures ranging from 300 to 800°C. TO-treated surfaces were then analyzed by Field Emission Scanning Electron Microscopy (FE-SEM), Energy Dispersive X-ray spectroscopy (EDX), and X-ray electron spectroscopy (XPS). Electrochemical corrosion tests and wear tests were carried out. Ni-Ti alloys exhibited different oxidation behavior depending on the treatment temperatures. An almost Ni free layer was observed on the surface layer of the specimens treated at temperatures 500°C and above. TO-treated specimens showed a higher corrosion resistance compared to that of the untreated sample, and a higher wear resistance. Consequently, TO-treatment produced an almost nickel free smooth protective oxide layer, which might contribute to good biocompatibility.

Original languageEnglish
Pages (from-to)3573-3578
Number of pages6
JournalInternational Journal of Modern Physics B
Volume20
Issue number25-27
Publication statusPublished - 2006 Oct 30

Keywords

  • Biomaterials
  • Ni-Ti alloy
  • Shape memory alloys
  • Surface treatment
  • Thermal oxidation

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics

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