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In this study, Sn 2+  solution simulation method is used to investigate the effect of Sn on pitting corrosion behavior of tin-containing ferritic stainless steel 430LX. It is found that the correlation between E pit  and [Sn 2+ ] is opposite to the correlation between critical potential temperature (CPT) and [Sn 2+ ]. After potentiostatic polarization at a specific potential, the correlations become the same. The CPT experiment after a series of potentiostatic steps proves that Sn 2+  exhibits positive influence only when the pH and potential is within a certain range. All the complicated phenomena can be explained by the under-potential deposition mechanism. SnO 2  passivation film that enhances the corrosion resistance is only produced when under-potential deposition occurs.

Investigation on pitting resistance of Sn-containing ferritic stainless steel with solution simulation method