Electrochemical Investigations of Pitting Corrosion in Nitrogen-Bearing Type 316LN Stainless Steel
| Autor: | G. C. Palit, H. S. Gadiyar, Vivekanand Kain |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Materials science
General Chemical Engineering Metallurgy Inorganic chemistry technology industry and agriculture chemistry.chemical_element Hydrochloric acid General Chemistry engineering.material Chloride Corrosion chemistry.chemical_compound Nickel chemistry Pitting corrosion engineering medicine Ferric General Materials Science Austenitic stainless steel Dissolution medicine.drug |
| Zdroj: | CORROSION. 49:977-991 |
| ISSN: | 1938-159X 0010-9312 |
| Popis: | Nitrogen (N) alloying was found to inhibit active dissolution and to introduce a secondary loop with fluctuating currents in the anodic polarization curve of type 316LN stainless steel (SS) (UNS S31653) in 1 N hydrochloric acid (HCl) solution. Potentiostatic tests in this potential range confirmed the occurrence of current transients as a result of metastable pits, resulting in secondary loop formation. Higher minimum chloride (Cl−) concentration and low acidic pH were shown to be required for stable pit formation in type 316LN SS compared to similar alloys without N alloying. Results showed no selective anodic dissolution of any of the alloying elements in actively growing pits in type 316LN SS. Although ammonium ions (NH4+) were found within pits under suitable applied potentials in 1 N HCl and under natural corrosion in ferric chloride (FeCl3) solutions, the more anodic the potential, the less was its yield. The formation of NH4+ ions was found to be greater at more active potentials under uni... |
| Databáze: | OpenAIRE |
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