The effect of phosphorus addition on the corrosion behavior of amorphous Ni-30Ta-P alloys in 12 M HCl

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

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The addition of 3 at% phosphorus to amorphous Ni-30Ta alloy results in two orders of magnitude decrease in the corrosion rate in 12 M HCl at 30 °C. The amorphous Ni-30Ta-P alloys with 2 at% or more phosphorus were spontaneously passive. The open circuit potential of the phosphorus-free amorphous Ni-30Ta alloy decreases with time and becomes constant in the active region of nickel. By contrast, the open circuit potentials of the phosphorus-containing alloys increase with time of immersion. XPS analysis reveals that surface films on the Ni-30Ta alloys are composed exclusively of Ta5+ ions as cations regardless of the presence of phosphorus. The film formed on the amorphous Ni-30Ta alloy is significantly thicker than that on the amorphous Ni-30Ta-5P alloy. The thick surface film on the Ni-30Ta alloy consists of a high concentration of OH- ions, while the passive film on the Ni-30Ta-5P alloy contains a high concentration of O2- ions.

Original languageEnglish
Pages (from-to)321-330
Number of pages10
JournalCorrosion Science
Volume37
Issue number2
DOIs
Publication statusPublished - 1995 Jan 1

ASJC Scopus subject areas

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

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