Abstract
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.
Published Version
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