Abstract
Abstract The influence of molybdenum and nitrogen on passivation of the nickel-bearing austenitic stainless steels (SS) Fe-20% Cr-20% Ni, Fe-20% Cr-20% Ni-6% Mo, and Fe-20% Cr-20% Ni-6% Mo-0.2% N in deaerated 0.1 M hydrochloric acid (HCl) + 0.4 M sodium chloride (NaCl) was investigated using electrochemical and x-ray photoelectron spectroscopic (XPS) analyses. Electrochemical analyses showed molybdenum and nitrogen improved passivation characteristics through an apparent synergism. Evidence was found of a compositional reorganization of SS in the atomic layers of the alloy immediately below the passive film. Nickel and molybdenum appeared to become enriched in proportions that suggested molybdenum-nickel intermetallic bonding. This was augmented by alloyed nitrogen, which strongly governed the elemental enrichment process. The possible nature of the bonding of these elements was reviewed with respect to the Engel-Brewer model of intermetallic bonding. Variable-angle XPS and electrochemical polarization an...
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