Effects of Thiosulfate on Susceptibility of Type 316 Stainless Steel to Stress Corrosion Cracking in 3.5% Aqueous Sodium Chloride
| Autor: | Badr G. Ateya, E. A. Abd El Meguid, E.A. Ashour |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Thiosulfate
Materials science Aqueous solution General Chemical Engineering Sodium Metallurgy chemistry.chemical_element General Chemistry Sodium thiosulfate engineering.material Chloride chemistry.chemical_compound chemistry medicine Pitting corrosion engineering General Materials Science Stress corrosion cracking Austenitic stainless steel medicine.drug Nuclear chemistry |
| Zdroj: | CORROSION. 53:612-616 |
| ISSN: | 1938-159X 0010-9312 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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