Electrochemical and XPS studies of the effects of alloying elements on the corrosion behavior of amorphous FeCrMetalloid alloys in 9 M H2SO4

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

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The corrosion behavior of amorphous FeCr13P7C, FeCr13P7B and FeCr20B alloys in 9 M H2SO4 solution at 30°C was investigated. An increase in the alloy chromium content improved the corrosion resistance of the amorphous FeCr13P7C and FeCr13P7B alloys. When only B is contained as a metalloid, alloying with chromium up to 15 at% is ineffective in increasing the corrosion resistance. The addition of phosphorus accelerates the cathodic reaction of hydrogen evolution on the amorphous FeCr alloys. This leads to sharp ennoblement in the corrosion potential of amorphous Fe8Cr13P7M (M C,B) alloys from the active state to the passive state with immersion time, while the corrosion potential of Fe8Cr20B alloy is unchanged. Chromium is concentrated in the passive film on the amorphous Fe8Cr13P7M (M C,B) alloys formed by immersion in 9 M H2SO4 solution, and is further concentrated by prolonged immersion. In particular, the concentration of chromic ions in the passive film on the Fe8Cr13P7C alloy is higher than that in the film on the Fe8Cr13P7B alloy.

Original languageEnglish
Pages (from-to)1829-1839
Number of pages11
JournalCorrosion Science
Volume34
Issue number11
DOIs
Publication statusPublished - 1993 Nov

ASJC Scopus subject areas

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

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