The corrosion behaviour of Zr-based bulk metallic glasses in 0.5M NaCl solution

Asahi Kawashima, Kazuyo Ohmura, Yoshihiko Yokoyama, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

The corrosion behaviour of eutectic Zr50Cu40Al10 and hypoeutectic Zr70Cu6Al8Ni16 bulk metallic glasses (BMGs) was studied by electrochemical measurements, scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS). Zr50Cu40Al10 BMG was highly susceptible to pitting corrosion in naturally aerated 0.5M NaCl solution at 30°C. In contrast, Zr70Cu6Al8Ni16 BMG passivated spontaneously under the same condition. EDX results for Zr50Cu40Al10 indicated that enrichment of Cu, Cl and O occurred in the pitted region, while for Zr70Cu6Al8Ni16 BMG, no significant difference was found in the surface composition from the specimens before and after immersion in the solution. XPS analysis including angle-resolved measurements for Zr70Cu6Al8Ni16 BMG revealed that zirconium cation (Zr4+) was highly concentrated in both air-formed and passive films. Furthermore, the concentration of Zr4+ ions after immersion for 24h or more showed tendency to increase with decreasing take-off angle, indicating that the exterior part of the passive film consisted exclusively of zirconium oxyhydroxide. The high corrosion resistance of Zr70Cu6Al8Ni16 BMG was attributed to the formation of homogeneous and stable passive film enriched with zirconium.

Original languageEnglish
Pages (from-to)2778-2784
Number of pages7
JournalCorrosion Science
Volume53
Issue number9
DOIs
Publication statusPublished - 2011 Sep

Keywords

  • A. Alloy
  • B. SEM
  • B. XPS
  • C. Passive films
  • C. Pitting corrosion

ASJC Scopus subject areas

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

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