Oxidation of Fe–22Cr Coated with Co3O4: Microstructure Evolution and the Effect of Growth Stresses

Anette Nørgaard Hansson, Monica Burriel, Gemma Garcia, Søren Linderoth, Marcel A. J. Somers

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The oxidation behavior of a commercially available Fe–22Cr alloy coated with a Co3O4 layer by metal organic—chemical vapor deposition was investigated in air with 1% H2O at 1,173 K and compared to the oxidation behavior of the non-coated alloy. The oxide morphology was examined with X-ray diffraction, electron microscopy, and energy dispersive X-ray spectroscopy. Cr2O3 developed in between the Co3O4 coating and the alloy, while alloying elements of the substrate were incorporated into the coating. Particular attention was devoted to possible sources of growth stresses and the effect of the growth stresses on microstructure evolution in the scales that developed on the non-coated and the coated Fe–22Cr alloy. Microstructural features suggested that scale spallation on coated Fe–22Cr occurred as a result of superimposing thermal stresses during cooling onto the growth stresses, that had developed during oxidation.
    Original languageEnglish
    JournalOxidation of Metals
    Volume68
    Issue number1-2
    Pages (from-to)23-36
    ISSN0030-770X
    DOIs
    Publication statusPublished - 2007

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