Inter-Diffusion between NiO Coating and the Oxide Scale on Fe-22Cr Alloy

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    The effect of Ni and NiO coatings on Fe-22Cr during oxidation at 1173K in 1% H2O was examined with respect to scale microstructure for oxidation times between 0 and 504 hours. Upon oxidation of the as pre-treated Fe-22Cr, Cr2O3 and a spinel developed. Oxidation and inter-diffusion between the Ni coating and Fe-22Cr occurred simultaneously. The scale consisted of NiO, a Fe-Ni spinel and Cr2O3. For the NiO coated alloy, a thin spinel layer developed between the NiO coating and the Cr2O3 scale. The microstructures of the scales are discussed with respect to calculated isotherms in the Fe-Cr-O, Cr-Ni-O and Ni-Fe-O phase diagrams and inter-diffusion profiles between Ni and Fe-22Cr.
    Original languageEnglish
    JournalJournal of Corrosion Science and Engineering
    Issue number73
    Pages (from-to)12
    Publication statusPublished - 2003


    • Materials technology


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