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

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

doi:10.1116/1.581683

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

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

New Industry Creation Hatchery Center (NICHe)

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	1059-1065
Number of pages	7
Journal	Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume	17
Issue number	3
DOIs	https://doi.org/10.1116/1.581683
Publication status	Published - 1999 Jan 1

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films

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abstract = "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.",

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N2 - 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.

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