The pitting corrosion of two duplex stainless steels was studied in chloride solutions. Phase compositions were determined by micro-analytical techniques and correlated with pitting behavior. The study showed that the pitting potential and the preferential pitting of the ferrite or austenite phase was dependent upon partitioning of the elements Cr, Mo, and N between the two phases. Alloying considerations leading to improved pitting resistance were discussed and it is proposed that the beneficial effects of alloyed nitrogen were due to surface enrichment of N atoms.
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Sriram et al. (1989) studied this question.
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