Stress Corrosion Cracking of an Austenitic Stainless Steel in Nitrite-Containing Chloride Solutions
This article describes the susceptibility of 316L stainless steel to stress corrosion cracking (SCC) in a nitrite-containing chloride solution. Slow strain rate testing (SSRT) in 30 wt. % MgCl2 solution established SCC susceptibility, as evidenced by post-SSRT fractography. Addition of nitrite to the chloride solution, which is reported to have inhibitive influence on corrosion of stainless steels, was found to increase SCC susceptibility. The susceptibility was also found to increase with nitrite concentration. This behaviour is explained on the basis of the passivation and pitting characteristics of 316L steel in chloride solution.
The effects of some anions on metastable pitting of 316L stainless steel
Abstract The effects of PO43−, CrO42−, SO42− and NO3− anions on metastable pitting of 316L stainless steel in NaCl solutions were investigated using potentiostatic and potentiodynamic polarization tests. The four anions all retard nucleation of metastable pitting. The inhibition effect decreases in the order: PO43−>CrO42−>SO42−>NO3−. The propagation rates of metastable pits are also decreased by the anions tested. Both metastable pitting potential Em and stable pitting potential Ep increase almost linearly with the increase of each anion concentration, and have very close increasing slopes.
Pitting of Iron by Chloride in Borate Buffer Solution Role of the Anodic Oxide Film
Etude du comportement anodique du fer en solution tampon de borate en presence ou non d'addition de chlorure de sodium. Comparaison et discussion des resultats