Corrosion of Chromia-Forming and Alumina-Forming Ferritic Stainless Steels under Dual Atmosphere Exposure Conditions

The surface morphology and chemistry of oxide scales formed on select chromia-forming and alumina-forming ferritic steels have been studied after exposure to a dual atmosphere of hydrogen and air. Localized Fe-rich oxide nodules with surface whiskers/platelets form at the onset of corrosion. The ini...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2021-11, Vol.168 (11), p.111506
Main Authors: Reisert, M., Anisur, M. R., Lee, L., Aphale, A. N., Hong, J., Yaginuma, M., Shiomi, T., Dale, N., Hussain, A. M., Singh, P.
Format: Article
Language:English
Subjects:
Corrosion
Electrochemistry
Fuel Cells - Solid Oxide
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Materials Science
Oxidation
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Summary:The surface morphology and chemistry of oxide scales formed on select chromia-forming and alumina-forming ferritic steels have been studied after exposure to a dual atmosphere of hydrogen and air. Localized Fe-rich oxide nodules with surface whiskers/platelets form at the onset of corrosion. The initiation and growth of localized nodules and breakdown of passivation are attributed to the presence of hydrogen, inclusion of iron oxide in the passivating scale, and subsequent growth of iron-rich oxide due to the establishment of redox (H 2 -H 2 O) atmosphere and modification of oxide defect chemistry.
ISSN:0013-4651
1945-7111
DOI:10.1149/1945-7111/ac38f9