Stress Corrosion Cracking Mechanisms of UNS S32205 Duplex Stainless Steel in Carbonated Solution Induced by Chlorides

Herein, the chloride-induced stress corrosion cracking (SCC) mechanisms of UNS S32205 duplex stainless steel (DSS) reinforcing bars in alkaline and carbonated solutions are studied. Electrochemical monitoring mechanical properties were tested using linear polarization resistance electrochemical impedance spectroscopy, coupled with slow strain rate tensile test (SSRT) to evaluate SCC behavior unravel pit-to-crack mechanisms. Pit initiation crack morphology identified by fractographic analysis, which revealed transgranular (TG) mechanism. HCO3− acidification enhanced anodic dissolution kinetics, thus promoting a premature transition, seen decrease maximum phase angle Bode plot at low frequencies (≈ 1 Hz) for solution. The propagation solution increased over 100% compared solution, coinciding lower from plots, as well charge transfer resistance. was found TiN nonmetallic inclusion inside ferrite cleavage facet, developed TG-SCC.