Effect of the final annealing of cold rolled stainless steels sheets on the electronic properties and pit nucleation resistance of passive films

J. Amri, T. Souier, B. Malki, B. Baroux

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

Semiconducting properties of passive films formed on AISI 304 stainless steel grade were investigated by capacitances measurements in chloride containing aqueous solutions for different surface finishes: BA (bright annealing in hydrogen containing atmospheres) and 2B (standard annealing in oxidising atmospheres followed by pickling in acid, then water rinsing). Mott-Schottky analysis shows that for high enough electrode potential, and whatever the surface finish, the films behave like n-type semiconductors. 2B passive film appears to be more donor-doped than BA one and the density of donor states increases with chloride concentration. The electron donor levels are assumed to be generated by negatively charged cations vacancies produced by the chloride ions reaction with the outer passive film. This reaction looks easier for 2B than BA condition, which explains why BA resists better than 2B to pit nucleation.

Original languageEnglish
Pages (from-to)431-435
Number of pages5
JournalCorrosion Science
Volume50
Issue number2
DOIs
Publication statusPublished - Feb 2008

Keywords

  • A. Industrial surface finishes
  • A. Stainless steels
  • B. Mott-Schottky
  • C. Pitting corrosion
  • C. Semiconducting properties

ASJC Scopus subject areas

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

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