High temperature solution-nitriding and low-temperature nitriding of AISI 316: Effect on pitting potential and crevice corrosion performance

摘要

Stainless steels grade AISI 316 was subjected to high temperature solution nitriding and low-temperature nitriding in order to dissolve various amounts of nitrogen in the bulk (up to approx. 0.45 wt%) and in a surface layer (up to approx. 13 wt%), respectively. Potentiodynamic polarization tests in a 0.1 M NaCl solution and crevice corrosion immersion tests in 3 wt% FeCl3 solution were studied before and after the bulk and surface treatments.