NH 4 + Generation: The Role of NO 3 − in the Crevice Corrosion Repassivation of Type 316L Stainless Steel

Abstract

© The Author(s) 2019. The role of NO3− in the repassivation of crevice corrosion of Type 316L stainless steel was investigated. In crevice corrosion tests, the solution was changed from 1 M NaCl to NaCl- NaNO3. NO3− led to complete repassivation, and after potentiostatic polarization in 2 M KNO3, NH4+ was detected in the crevice solution by ion chromatography analysis. Repassivation of the crevice corrosion was found to take place in two steps. In the first step, the estimated current density inside the crevice gradually decreased from ca. 5 mA cm−2 to ca. 5 μA cm−2. After that, the current density suddenly decreased to less than 0.1 μA cm−2. From the potentiodynamic polarization in acidic solutions simulated inside the crevice (pH 0.2) and in situ observations of the crevice corrosion morphology, the first step was thought to be generated by the suppression of active dissolution by NO3−. It would appear that the generation of NH4+ results in a pH increase and the further suppression of active dissolution, and then repassivation occurs.