The effect of thiosulfate addition on the metastable pitting behavior of stainless steels 304L (UNS S30403) and lean duplex stainless steel (LDX2101, UNS S32101) in 0.6 M NaCl solution was studied. It was found that metastable pits initiate preferentially on the ferritic phase of S32101. Current transients during potentiostatic polarization were used to study the pitting behavior of the tested steels. Statistical analysis of peak current, growth time, and occurrence time of the metastable pitting events was used to evaluate pitting behavior. From the distribution curves of these parameters, it was concluded that the addition of thiosulfate stabilizes metastable pit growth and promotes pitting kinetics in chloride solution. This effect is more pronounced for 304L compared to S32101.
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1 May 2016
Research Article|
January 27 2016
Effect of Thiosulfate on Metastable Pitting of 304L and S32101 in Chloride- and Thiosulfate-Containing Environment
Yushu Wang;
Yushu Wang
*Georgia Institute of Technology, 500 Tenth Street, N.W., Atlanta, GA 30318.
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Gaoxiang Wu;
Gaoxiang Wu
*Georgia Institute of Technology, 500 Tenth Street, N.W., Atlanta, GA 30318.
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Liang He;
Liang He
*Georgia Institute of Technology, 500 Tenth Street, N.W., Atlanta, GA 30318.
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Preet M. Singh
Preet M. Singh
‡
*Georgia Institute of Technology, 500 Tenth Street, N.W., Atlanta, GA 30318.
‡Corresponding author. E-mail: [email protected].
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‡Corresponding author. E-mail: [email protected].
Received:
October 26 2015
Revision Received:
January 27 2016
Accepted:
January 27 2016
Online ISSN: 1938-159X
Print ISSN: 0010-9312
© 2016, NACE International
2016
CORROSION (2016) 72 (5): 628–635.
Article history
Received:
October 26 2015
Revision Received:
January 27 2016
Accepted:
January 27 2016
Citation
Yushu Wang, Gaoxiang Wu, Liang He, Preet M. Singh; Effect of Thiosulfate on Metastable Pitting of 304L and S32101 in Chloride- and Thiosulfate-Containing Environment. CORROSION 1 May 2016; 72 (5): 628–635. https://doi.org/10.5006/1955
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