The effect of air exposure on the corrosion behavior of amorphous Fe-8Cr-Mo-13P-7C alloys in 1 M HCl

M. W. Tan, E. Akiyama, A. Kawashima, K. Asami, K. Hashimoto

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)

Abstract

Amorphous Fe-8Cr-13P-7C alloy is corroded severely in 1 M HCl open to air. The addition of more than 2 at% molybdenum is effective in promoting spontaneous passivation. According to XPS analysis, chromium accumulates continuously in the surface film on molybdenum-containing alloys throughout the immersion experiment for 20 h, whereas for the molybdenum-free alloy an initial slight increase in chromium concentration in the surface film is followed by an almost continuous decrease. Molybdenum and phosphorus are deficient in the air-formed film but become concentrated in the film with immersion time. The Mo4+ species which is the constituent of the passive film on molybdenum metal is increased. Air exposure for 30 min prior to the polarization or immersion experiment in 1 M HCl raises the open circuit potential of specimens and retards the enrichment of chromium in the passive film on molybdenum-bearing alloys.

Original languageEnglish
Pages (from-to)1289-1301
Number of pages13
JournalCorrosion Science
Volume37
Issue number8
DOIs
Publication statusPublished - 1995 Aug

ASJC Scopus subject areas

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

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