Straining metal electrode as a SCC test. Type 304 stainless steel in MgCl2, CaCl2 and LiCl solutions

Maier, I. A.; Pérez, E.; Galvele, J.R.

doi:10.1016/0010-938x(82)90053-1

Cited by 10 publications

(1 citation statement)

References 18 publications

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“…48 Local pit environments contain a higher concentration of chloride than the bulk solution due to anion electromigration into the pit to balance the charge associated with increasing metal cation concentration, thus maintaining charge neutrality. Pit growth and repassivation are strong functions of local chloride concentration and local pH, 49,50 where for stainless steels local chloride concentration is considered to be more important in stabilizing growth and preventing repassivation. 47 In Figure 3, even with a lower bulk solution chloride concentration and a higher pH than most other related studies of stainless steels, the SS 304L and SS 316L alloys still suffered pitting corrosion.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical and Passive Layer Characterizations of 304L, 316L, and Duplex 2205 Stainless Steels in Thiosulfate Gold Leaching Solutions

Mohammadi

Choudhary

Gadala

et al. 2016

J. Electrochem. Soc.

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Thiosulfate extraction of gold has sparked widespread interest in recovering gold from carbonaceous and copper-containing gold ores. However, thiosulfate ions are known to be dangerous corrosion promoters of structural materials. Accordingly, this study aims at characterizing the electrochemical corrosion performance of various structural steels in calcium thiosulfate and ammonium thiosulfate gold leaching solutions. The corrosion behavior was investigated using cyclic potentiodynamic polarization, open circuit potential monitoring, and electrochemical impedance spectroscopy. It was found that the stainless steels, namely 304L, 316L and duplex 2205, manifested no sign of pitting corrosion in the calcium thiosulfate leaching solution. Thiosulfate ions at a high concentration of 0.1 M in the calcium thiosulfate leaching solution played a protective role against pitting corrosion. In the ammonium thiosulfate leaching solution also, findings indicated the absence of pitting/localized corrosion for the duplex 2205 stainless steel. The thicknesses of the passive films formed on the stainless steels at different operating conditions were calculated using a variety of proposed electrochemical models and the obtained results were validated with ToF-SIMS experimental results. It was determined that the recently-developed power-law (P-L) model predicts the film thickness more accurately than the other models studied.

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