Influence of Metal Cations on Corrosion Behavior of Carbon Steel in Model Fresh Water

Abstract

Effects of metal cations on the corrosion behavior of carbon steel SM490Y in 10 mM Cl^‐ model fresh water were investigated by immersion tests, electrochemical tests, and surface analysis. Immersion tests and electrochemical tests results showed that Zn²⁺ had a significant inhibition effect on corrosion of SM490Y. The results of EDS and XPS showed that Zn²⁺ was incorporated in the oxide films by making a strong bond and formed zinc hydroxide or zinc oxide which can cover the surface of carbon steel. It is suggested that Zn²⁺ forms a protective film which can efficiently prevent break down of surface film by Cl^‐ and inhibit the corrosion.