Electrochemical Behavior of 316 L Stainless Steel in Alkaline Environments Containing Chloride Ion

Abstract

This article intends to study corrosion of 316 L stainless steel alloy in simulated concrete environments. A composition of 0.1 M sodium hydroxide plus 0.1M potassium hydroxide with different pH (9, 11 and 13) and 0, 3 and 10 wt % sodium chloride concentration has been utilized for this manner. Potentiodynamic polarization and electrochemical impedance spectroscopy were used to study electrochemical behavior. The results of potentiodynamic polarization indicate that the formed passive layer becomes more stable and its failure takes place later as increasing pH. Electrochemical impedance test also has confirmed the obtained results and also showed that the corrosion resistance of the sample assessed over dilution time. At a solution with high alkalinity (pH 13) results showed increase in total impedance after 24 h of dilution related to passive film stabilization which did not observed in samples with lower pH. In this work, electrochemical behavior of 316 L stainless steel in alkaline environments of simulated concrete is studied with chlorine ion addition and pH adjustment.