Anodic passivation of Type 316L stainless steel in a borate‐boric acid buffer solution was studied using cyclic voltammetry and Auger spectroscopy. Based on a comparison with the results obtained on the metals (iron, chromium, and nickel), the reduction peaks appearing in the voltammograms for the steel were attributed to the reductive dissolution of a ferric oxide and to valence transitions associated with chromium and nickel in the oxide. It is shown that cyclic voltammetry in the buffer solution provides a qualitative and semiquantitative analysis of the passive film growth. Okamoto's model of formation of two types of films, determined by the anodization potential, is found to be applicable; the mechanism of oxide growth is related to selective enrichment of iron or chromium, which is based on solubility relationships predicted by thermodynamic considerations.
Ein Vergleich mit den Voltammogrammen der reinen Metalle (Fe, Cr, Ni) zeigt, daß die Reduktionspeaks des Edelstahls der reduktiven Zers. von PC203 und Cr‐ und Ni‐Valenzübergängen im Oxidfilm zugeschrieben werden können.
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