Electrochemical investigations of pitting corrosion behaviour of type UNS S31603 stainless steel in thiosulfate-chloride environment

Almarshad, A.I.; Jamal, D.
January 2004
Journal of Applied Electrochemistry;Jan2004, Vol. 34 Issue 1, p67
Academic Journal
The pitting corrosion behaviour of type UNS S31603 stainless steel (316L SS) in 0.01, 0.05 and 0.1 M thiosulfate ion (S2O32-) in the absence and presence of various concentrations of chloride ion (Cl-) was studied using the cyclic potentiodynamic polarization method. The influence of major factors which affect pitting corrosion such as pH and temperature, were also investigated. It was found that both the pitting potential (Epit) and the repassivation potential (Erp) decreased with increase in Cl- concentration and solution temperature and a more pronounced difference in Epit values for various concentrations of S2O32- in 1.0 M Cl- was obtained at lower temperatures. The effect of pH on Epit, Ecorr and Erp values for different concentrations of S2O32- in the presence of 1.0 M Cl- was also determined.


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