In situ studies of passive film chemistry using X-ray absorption spectroscopy

Alison J. Davenport*, Hugh S. Isaacs, Jennifer A. Bardwell, Barry MacDougall, Gerald S. Frankel, Alex G. Schrott

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

The application of X-ray absorption spectroscopy to the study of passivation of thin metal films is discussed. Data are presented which demonstrate the effectiveness of the technique for monitoring both potential- and time-dependent data on valency and selective dissolution from passive films. It is shown that iron undergoes reductive dissolution from the passive oxide film on both pure iron and Fe-26Cr, in the latter case leading to enrichment of chromium in the passive film. Transpassive dissolution of chromium can take place on Al-Cr and Fe-Cr only after it has been enriched in the passive film by dissolution of the other alloying element. Rapid polarization of Al-Cr leads to trapping of electroactive chromium in the passive film.

Original languageEnglish
Pages (from-to)19-25
Number of pages7
JournalCorrosion Science
Volume35
Issue number1-4
DOIs
Publication statusPublished - 1993
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

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