Effect of pH on Corrosion Behaviors of 316L Stainless Steel and Q235 Carbon Steel in High Chloride Solution

The corrosion behaviors of 316L stainless steel and Q235 carbon steel in the simulated solutions with high concentration of chloride and different pH were studied by electrochemical impedance spectroscopy (EIS), polarization curves and wire beam electrode (WBE). The results showed that with the increase of solution pH, the impedance value of the two materials increased gradually, while the passivity current density of 316L stainless steel and corrosion current density of Q235 carbon steel decreased. Furthermore, the zones of anodic current decreased sharply in the WBE current distribution maps, and the stainless steel showed localized corrosion and the carbon steel showed general corrosion feature.