Corrosion Behavior of 316LN Austenitic Stainless Steel in Cl^- Containing Solution

The stress corrosion cracking and corrosion behavior of 316LN austenitic stainless steel were studied by slow strain rate tensile and electrochemical methods in different corrosive media (3wt% NaCl solution, 6wt% FeCl₃ solution) at different temperatures (25, 50℃) through comparing with those of 316L austenitic stainless steel. The results show that in Cl^- containing solution, the stress corrosion sensitivity of 316LN steel was lower than that of 316L steel. 316LN steel exhibited passivation-breakdown behavior in NaCl solution, while in FeCl₃ solution, it presented the characteristics of active dissolution, and the impedance spectrum showed a single capacitive reactance arc in both. The higher the temperature, the larger the self-corrosion current, the smaller the arc radius and the charge transfer resistance of 316LN steel. 316LN steel showed better corrosion resistance than 316L steel.