The roles of tantalum and phosphorus in the corrosion behavior of Ni-Ta-P alloys in 12 M HCl

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

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The corrosion behavior of Ni-10Ta-20P, Ni-10Ta and Ni-20P alloys in 12 M HCl solution open to air at 30°C was investigated in order to clarify the roles of tantalum and phosphorus. Additions of 10 at% tantalum and 20 at% phosphorus to the nickel alloy result in excellent corrosion resistance and in the accumulation of tantalum and phosphorus in the surface film on this alloy owing to dissolution of the nickel from just after immersion, the highly protective passive film formed being stable during prolonged immersion. By contrast, the binary nickel alloy with only a tantalum addition is not passivated and dissolves actively, forming a thick corrosion product film. The nickel alloy containing only phosphorus is not corrosion-resistant, forming a nickel phosphate film, although the film is more stable than that formed on the nickel alloy containing only tantalum.

Original languageEnglish
Pages (from-to)321-332
Number of pages12
JournalCorrosion Science
Volume39
Issue number2
DOIs
Publication statusPublished - 1997 Jan 1

Keywords

  • A. alloy
  • B. XPS
  • C. passive films

ASJC Scopus subject areas

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

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