Abstract
The analysis of current transients occurring on Mo containing ferritic Fe–18Cr steels in chloride containing electrolyte in absence or presence of MoO 4 2 - molybdate anions as external inhibitor reveals insight into the role of Mo-species in metastable pitting events, consisting of pit initiation, pit propagation including some metal dissolution, and pit repassivation. A mathematical method on the basis of statistical distribution functions was developed in order to meet the requirements of a systematic data analysis which allows to compare different systems of alloys and electrolytes. The results clearly indicate the beneficial effect of alloyed Mo as well as MoO 4 2 - in the electrolyte in inhibiting (metastable) pitting corrosion. However, the mechanism of inhibition is unlike for alloyed Mo and MoO 4 2 - added into the electrolyte.
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