Effect of phosphorus on the passivation behavior of amorphous Fe8Cr13P7C alloy in 9M H2SO4 solution

Byung Mo Im, Eiji Akiyama, Hiroki Habazaki, Asahi Kawashima, Katsuhiko Asami, Koji Hashimoto

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The beneficial effect of phosphorus on the corrosion and passivation behavior of amorphous Fe8Cr13P7C alloy was studied in 9M H2SO4 solution at 30 °C. The corrosion loss of the amorphous Fe8Cr13P7C alloy in an initial period of immersion was relatively high but was scarcely changed afterwards. The corrosion potential was initially in the active region of this alloy but was shifted positively up to the passive region within 30 min. The air-formed film was enriched in chromium but was not protective and dissolved quickly in the initial stage of corrosion. The concentration of chromic ions in the surface film increased with the immersion time. Elemental phosphorus was accumulated on the alloy surface during the initial dissolution. The formation of the elemental phosphorus layer made the open circuit potential more positive as a result of the acceleration of the cathodic hydrogen evolution and by the suppression of the anodic dissolution current. This led to spontaneous passivation as a result of the formation of the chromium-enriched passive film.

Original languageEnglish
Pages (from-to)1119-1122
Number of pages4
JournalMaterials Science and Engineering A
Volume181-182
Issue numberC
DOIs
Publication statusPublished - 1994 May 15

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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