期刊
MATERIALS RESEARCH EXPRESS
卷 8, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2053-1591/ac09bc
关键词
Sn-containing ferritic stainless steel; pitting corrosion; solution simulation; under-potential deposition
资金
- National Natural Science Foundation of China [52071082, 51901046]
This study reveals that Sn2+ positively influences the pitting corrosion behavior of tin-containing ferritic stainless steel under specific conditions, which is related to the correlation between CPT and E-pit.
In this study, Sn2+ 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 [Sn2+] is opposite to the correlation between critical potential temperature (CPT) and [Sn2+]. After potentiostatic polarization at a specific potential, the correlations become the same. The CPT experiment after a series of potentiostatic steps proves that Sn2+ 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. SnO2 passivation film that enhances the corrosion resistance is only produced when under-potential deposition occurs.
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