The role of morphology and structure in the kinetic evolution of iron-sulfide films on Fe-base alloys

V. K. Pareek, T. A. Ramanarayanan, J. D. Mumford, A. Ozekcin, J. C. Scanlon

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Sulfidation corrosion of 4130 steel in CH3SH was studied in the temperature range 250-550°C. The rate of sulfidation attack was found to be a function of temperature and sulfur activity. Investigations of the corrosion process led to the proposal of two mechanisms of sulfidation, dependent on temperature. Cation diffusion through the iron sulfide corrosion product is the rate-determining step at higher temperatures (>370°C), while a surface reaction was identified as the rate-limiting step at lower temperatures. The corrosion scale has preferred orientation as determined by X-ray diffraction and morphological observations. The lower-temperature corrosion product is made up of columnar grains of pyrrhotite crystals with the c-axis aligned nearly perpendicular to the steel substrate. At high temperatures, a whisker morphology developed with the whiskers having variable texture with respect to the steel substrate. A preformed-surface-oxide layer on 4130 steel does not appear to significantly reduce sulfidation corrosion.

Original languageEnglish (US)
Pages (from-to)323-341
Number of pages19
JournalOxidation of Metals
Volume41
Issue number5-6
DOIs
StatePublished - Jun 1 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry
  • Metals and Alloys
  • Materials Chemistry

Keywords

  • diffusion
  • kinetic transitions
  • preformed-oxide layer
  • sulfidation corrosion
  • texture
  • whisker morphology

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