Abstract
Abstract Effects of thiosulfate on stress corrosion cracking (SCC) susceptibility (S) of type 316 (UNS S31600) stainless steel (SS) were studied. Addition of sodium thiosulfate (Na2S2O3) to 3.5% sodium chloride (NaCl) increased S of type 316 SS to SCC. A quantitative expression for S was given by: where σmax and tf are the maximum stress and time to failure, respectively. Metallographic observations revealed the fracture mode changed from ductile to brittle for S > ∼ 0.2. An increase in potential in the noble direction increased S significantly. An increase in Na2S2O3 concentration increased S at higher potentials but had no tangible effect around the free-corrosion potential (∼ 100 mVNHE). Na2S2O3 also shifted the pitting potential of type 316 SS to more active values and led to formation of wider and more open pits.
Published Version
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