The influence of Mo, V, W in ferrochrome alloys and of SO4=, ClO4−, Cl− in an aqueous electrolyte was investigated electrochemically. The effect of minor alloying elements was most pronounced in the active potential region, prior to passivation; Mo, V reduced pitting while W enhanced it. Cl− promoted pitting whereas SO4= and ClO4− were inhibitors. Removal of surface sulfate ions destroyed this inhibitive effect. Relationships were developed between Epit, Erep, ipp and [anion] which enabled the prediction of [SO4=] and [Cl−] required to inhibit and induce pitting respectively.
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Brookes et al. (1989) studied this question.
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