Passivation of stainless steel by δ-Al2O3 films resistant to ozonized water

M. Yoshida, A. Seki, Y. Shirai, T. Ohmi

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Alumina films have been successfully formed on austenitic stainless steels containing 4 and 5 wt % Al by selective oxidation of Al in a H2O/H2 environment. γ-alumina films have been formed by oxidation at 800°C and δ-alumina films at 900°C. Satisfactory corrosion resistance performance for ozone gas has been obtained for both γ- and δ-alumina films. For ozonized water, δ-alumina films formed with pH2O/pH2≤1 × 10-4 have good corrosion resistance while δ-alumina films formed with pH2O/pH2≥3 × 10-4 or γ-alumina films do not. Holes of a characteristic triangular shape are observed on the oxidized surface of stainless steels containing 4 wt % Al, probably caused by the habitual formation of precipitated β-(Fe,Ni)Al. No such hole has been observed on the oxidized surface of stainless steels containing 5 wt % Al.

Original languageEnglish
Pages (from-to)1059-1065
Number of pages7
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Issue number3
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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