Effect of the surface segregation of chromium on oxidation of high-purity Fe-Cr alloys at room temperature

S. Suzuki, T. Kosaka, H. Inoue, M. Isshiki, Y. Waseda

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

Angle-resolved X-ray photoelectron spectroscopy (AR-XPS) has been used for investigating the effect of the surface segregation of chromium on oxide films formed on the surface of high-purity iron - 13% and 25% chromium alloys at room temperature (298 K). The chromium segregation in the surface was confirmed by in-situ heating at 973 K under ultra high vacuum. The effective thickness of its segregated zone was evaluated to be less than 1 nm, from the relationship between the concentration of iron and chromium and the take-off angle in AR-XPS. The effective concentration of segregated chromium was estimated a few times as much as the bulk concentration. The surface with the chromium segregation was subsequently exposed to air, and an oxide film formed on the surface was also characterized. The oxide film formed on the surface with the chromium segregation was found to be thinner than the case without segregation. These results on the surface layer were consistent with spectral information of the chemical state denoted by Fe 2p and Cr 2p.

Original languageEnglish
Pages (from-to)495-502
Number of pages8
JournalApplied Surface Science
Volume103
Issue number4
DOIs
Publication statusPublished - 1996 Dec

Keywords

  • Angle-resolved X-ray photoelectron spectroscopy
  • High-purity
  • Iron-chromium alloys
  • Oxidation
  • Surface segregation

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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