Abstract
The influence of chromium content and polarization potential on the surface composition of ferritic FeCrMo alloys with 11 wt.% Mo exposed to hydrochloric acid has been investigated by AES depth profile analysis in order to contribute to the resolution of apparently contradictory results in the literature and to the better understanding of the role of molybdenum for the corrosion behaviour of stainless steels. A new approach to the interpretation of AES depth profiles has been used which is based on determining relative composition changes with respect to a suitably chosen standard. Contrary to published AES studies but consistent with XPS results enrichment of molybdenum in the active and low passive potential region was observed. However, no straightforward relationship between the molybdenum content of the passive film and the pitting resistance of the alloy could be found.
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