Abstract
The paper presents the results of a study conducted on the effects of chloride-hydrogen sulfide (H2S) synergism on the electrochemical behavior and stress corrosion cracking (SCC) susceptibility of Type 321 stainless steel (SS). Thiosulfate was used as a replacement for H2S. The electrochemical work included double-loop potentiokinetic reactivation to assess the degree of sensitization and cyclic polarization to study the susceptibility toward pitting. Slow strain rate test (SSRT) was used to assess the susceptibility of Type 321 SS to SCC. The tests were performed on the solution annealed and aged Type 321 SS. Aging was performed at 500°C for 100 h and 1,000 h. The results showed that the presence of H2S in NaCl solution increased the susceptibility of the alloy to pitting and SCC. The fracture surface of specimens failed by SCC was covered with sulfide scale, which was enriched in nickel and depleted in iron. A threshold chloride concentration was found necessary to induce SCC in the chloride-H2S enviro...
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