Growth process of protective oxides formed on type 304 and 430 stainless steels at 1273K

Oxidation of Type 304 and 430 stainless steels for up to 1 # h was studied at 1273K and the composition and structure of the oxide were determined by x-ray photoelectron spectroscopy (XPS) and x-ray diffraction (XRD). In the initial several tens of seconds, only iron-rich corundum-type oxide was for...

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Bibliographic Details
Published in:Corrosion science 1998-08, Vol.40 (8), p.1295-1302
Main Authors: Saeki, I, Saito, T, Furuichi, R, Konno, H, Nakamura, T, Mabuchi, K, Itoh, M
Format: Article
Language:English
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Summary:Oxidation of Type 304 and 430 stainless steels for up to 1 # h was studied at 1273K and the composition and structure of the oxide were determined by x-ray photoelectron spectroscopy (XPS) and x-ray diffraction (XRD). In the initial several tens of seconds, only iron-rich corundum-type oxide was formed, whereas the final oxide was composed of an inner chromium-rich corundum-type oxide layer and an outer mixed layer of corundum-type and spinel-type oxides. An iron-rich metallic alpha phase was observed on Type 304 stainless steel. This suggests a growth mechanism where corundum-type oxide on Type 304 stainless steel repeats cycles of breakage and curing of the oxide, resulting in the formation of metallic alpha phase in the oxide layer. A similar reaction is postulated to take place in the oxidation of Type 430 stainless steel.
ISSN:0010-938X
DOI:10.1016/S0010-938X(97)00146-7