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Coated steels are extensively used as various constructional material due to low cost and good mechanical and anti-corrosion properties than other steels. Zinc coated steel is one of the most common materials and has wide applications in automobiles, buildings, bridges, marine platforms and port docks.1–4) In the environment that contains Cl − , main factors of steel corrosion are the concentration and corrosive nature of the Cl −, and the passive film is generally destroyed by this ion in aqueous environment.5–8) It is well known that the Cl − concentration reaches a high level on the steel surface during drying situation of atmospheric environment. There are many studies have been carried out about the corrosion of zinc coated steel in the Cl − aqueous environment at high concentration.9–13) Sun et al.14) reported that ZnO and Zn(OH)2 are produced as corrosion products when zinc coated steel is exposed in aqueous environment and corrosion protective ability is attributed by these corrosion products. Tsuru15) proposed that Zn2+ is dissolved from the corrosion products and readsorb onto the steel and prevent further corrosion of the steel substrate. Same phenomena occur while carbon steel is exposed in the aqueous solution with Zn2+ .16) The cation adsorbs as hydroxides onto the steel substrate and suppress the corrosion reactions of steel. There are many researchers reported that metal cations (Zn2+ and Al3+) can reduce Role of Metal Cations on Corrosion of Coated Steel Substrate in Model Aqueous Layer