Corrosion behavior of Ti-based metallic glasses

Fengxiang Qin, Xinmin Wang, Asahi Kawashima, Shengli Zhu, Hisamichi Kimura, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

The corrosion behavior of the Ti47.5Cu42.5Ni 7.5Zr2.5 metallic glass as well as its modified glasses by the addition of 5 at% Co, Nb or Ta was investigated by electrochemical measurements. Potentiodynamic polarization was carried out in 0.14 kmol/m 3 NaCl solution and 0.2 kmol/m3 phosphate buffer solution with 0.14 kmol/m3 Cl- ion. All the metallic glasses examined were spontaneously passivated with significantly low passive current density in sodium chloride solution and phosphate buffer solution. The additional elements improve the corrosion resistance and the effect of Nb or Ta is particular. The results of XPS revealed that the passive films were rich in titanium and deficient in copper and nickel. The higher corrosion resistance for the modified glasses is attributed to stable and protective passive films enriched with titanium cation contained certain amount of additional elements. In phosphate buffer solution, the pitting potentials for all glasses are higher than those in NaCl solutionpossibly due to inhibiting ability of phosphate ion absorbing on the glassy surface.

Original languageEnglish
Pages (from-to)1934-1937
Number of pages4
JournalMaterials Transactions
Volume47
Issue number8
DOIs
Publication statusPublished - 2006 Aug

Keywords

  • Passivation
  • Titanium-based metallic glass
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

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

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