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Report No.

Effects of zinc ion concentration on the surface film structure of mild steel in aqueous solution with chloride ion

Islam, M. S.*; Otani, Kyohei   ; Sakairi, Masatoshi*

In the previous study, it was founded that Zn$$^{2+}$$ significantly inhibited the corrosion of mild steel in Cl$$^{-}$$ aqueous solution at room temperature. It is still not fully elucidated the corrosion inhibition ability of Zn$$^{2+}$$ concentration on the steel in Cl$$^{-}$$ aqueous solutions. In the present study, the effects of Zn$$^{2+}$$ concentration on the corrosion inhibition of mild steel were investigated by immersion tests. From the immersion tests, it was found that mass change of specimen closely related to the Zn$$^{2+}$$ concentration in the solutions. SEM images showed that the numbers of pits are decreasing with increasing the Zn$$^{2+}$$ concentration. XPS and AES results showed that Zn$$^{2+}$$ existed as hydroxides by forming a layer with the surface film and the coverage of the layer is increased with increase in Zn$$^{2+}$$ concentration.



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