Journal
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY
Volume 55, Issue 3, Pages 232-240Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/1478422X.2020.1721807
Keywords
Ferritic stainless steel; intergranular corrosion; tin addition; TEM; XPS
Funding
- National Natural Science Foundation of China [51871061, 51671059, 51801028, 51501041]
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The intergranular corrosion (IGC) susceptibility of the Ti-Nb-stabilised ultra-pure 430LX FSSs with 0-0.47 wt-% tin addition was investigated using double loop electrochemical potentiokinetic reactivation (DL-EPR) and oxalic acid etch tests. The result of DL-EPR test reveals that IGC resistance increases with the increase in tin content. The specimens with different contents of tin exhibit the same microstructural evolution based on oxalic acid etch test. M23C6 precipitates form along grain boundaries, inducing Cr-depleted zones and finally resulting in the susceptibility to IGC. Tin addition gives rise to the formation of SnO2 on the FSSs surface, thus inhibiting the attack of corrosive ions towards Cr-depleted zones.
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