The influence of concentration of hydrochloric acid solutions on the passivation behavior of sputter-deposited tungsten rich W-Nb alloys

J. Bhattarai, Eiji Akiyama, H. Habazaki, A. Kawashima, K. Asami, K. Hashimoto

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Nano-crystalline single phase bcc solid solution of sputter-deposited tungsten-rich W-Nb alloys are passivated spontaneously in all hydrochloric acid solutions examined, and their corrosion rates are dependent upon the concentration of HCl solutions at 30°C. The corrosion rate of the tungsten-rich W-Nb alloys in 12 M HCl is lower than that in 6 M HCl, although the initial corrosion rate measured for less than about 24 h in 12 M HCl is higher than that in 6 M HCl. XPS and AFM results reveal that the more aggressive nature of 12 M than 6 M HCl solution enhances fast formation of more stable and protective passive films, consisting of tungsten-rich double oxyhydroxide of tungsten and niobium ions due to fast dissolution of niobium. This is responsible for higher corrosion resistance in 12 M HCl than that in 6 M HCl solution at 30°C.

Original languageEnglish
Pages (from-to)1897-1914
Number of pages18
JournalCorrosion Science
Volume40
Issue number11
DOIs
Publication statusPublished - 1998 Nov 1

Keywords

  • AFM
  • Alloy
  • Passive films
  • Weight loss
  • XPS

ASJC Scopus subject areas

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

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