Open AccessInvestigation on pitting resistance of Sn-containing ferritic stainless steel with solution simulation method
Author(s) -
Y. Tan,
Yangting Sun,
Longlin Lei,
Yuanyuan Liu,
Jin Li,
Yiming Jiang
Publication year - 2021
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ac09bc
Subject(s) - passivation , materials science , tin , pitting corrosion , corrosion , metallurgy , polarization (electrochemistry) , deposition (geology) , composite material , chemistry , paleontology , layer (electronics) , sediment , biology
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.
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