On the effect of pre-oxidation on the nitriding kinetics

Peter Bernhard Friehling, Marcel A. J. Somers

    Research output: Contribution to journalJournal articleResearchpeer-review


    The oxidation of ferritic surfaces prior to gaseous nitriding has been reported to lead to improved uniformity of the compound layer thickness and enhanced nitriding kinetics. The present work considers the nucleation and growth of a model compound layer on pure iron and, using previous experimental and theoretical work reported in the literature, puts forward two hypotheses to explain the effects of pre-oxidation on compound layer formation. It is proposed that the nucleation of iron nitrides is enhanced by the presence of an iron-oxide layer and that the growth of an iron-nitride layer proceeds faster after pre-oxidation, due to a higher nitrogen content in the part of the compound layer closest to the surface.
    Original languageEnglish
    JournalSurface Engineering
    Pages (from-to)103-106
    Publication statusPublished - 2000


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