Effects of nitrogen on the repassivation behavior of Type 304L (UNS S30403) alloy in a sodium chloride (NaCl) solution at 25°C were investigated using a rapid scratched-electrode technique. The repassivation rate was faster in the alloy with nitrogen (0.1 wt%) than the alloy without nitrogen. Irrespective of their repassivation rate, the reformation of passive film occurred three steps with different kinetics. The film growth during the repassivation process was evaluated by the highfield ion conduction model. The beneficial effect of nitrogen on the repassivation behavior of austenitic stainless steel was attributed to Cr enrichment in the passive film.

Subject
Ions, Metal surfaces, Passive films, Repassivation, Repassivation potentials, Sodium chloride, X-ray spectroscopy, Sodium chloride solution, Nitrogen, Film formation, Sputter deposition, Pitting, Alloys
Keywords:
chloride solution, kinetics, nitrogen, passive films, repassivation, stainless steel
NACE International
2004
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