期刊
CORROSION SCIENCE
卷 51, 期 3, 页码 562-568出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2008.12.002
关键词
Stainless steel; Oxidation; Photoelectrochemistry; Raman spectroscopy; XRD
资金
- French government
- Faculty of Applied Science, KMUTNB, Thailand
Room temperature photoelectrochemistry was used to characterise oxide phases grown during the initial stages of oxidation of the ferritic stainless steel AISI441 at 650 degrees C and 850 degrees C in synthetic air or in water vapour. Grazing incidence X-ray diffraction and Raman spectroscopy were additionally used to discuss PEC results. Haematite Fe2O3 (similar to 2.0 eV), chromia Cr2O3 (3.0 and 3.5 eV) and their mutual solid solution (similar to 2.5 eV) were detected by their respective bandgap values determined from photocurrent vs. energy curves. The Cr/Fe ratio of the films increased with time/temperature and was higher in air-grown than in H2O-grown oxides. Observation of photocurrent vs. potential curves indicated that chromia was N-type in all specimens, resulting from thermodynamic equilibrium with the metallic substrate and not with the gas phase. (C) 2008 Elsevier Ltd. All rights reserved.
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