Abstract
The effects of nitrogen on localized corrosion resistance of HNS developed at NIMS were investigated in terms of crevice corrosion in artificial seawater at 35C. Synergistic effect between N and Mo was also discussed. High nitrogen steels containing molybdenum showed crevice corrosion resistance superior to that of molybdenum-free steel. Possible mechanism of improvement of localized corrosion by N alloying was also discussed. It was found that not only the buffer effect of pH by ammoniac ions but also inhibitor effect by nitrate ions played important role for improving localized corrosion property of HNS.
