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Rhode, S.; Kain, V.; Raja, V.S.; Abraham, G.J.
Materials characterization, 03/2013, Letnik: 77Journal Article
Stainless steels usually contain some amounts of sulfide type of inclusions which are known to affect their corrosion behavior in mild aqueous chloride solutions. The life of the stainless steel components is severely affected as the manganese sulfide inclusions dissolve and the reaction products at the site of inclusions lead to pitting corrosion. The pits so formed as well as manganese sulfide inclusions, being local heterogeneities were studied by a microprobing technique called scanning electrochemical microscopy. In order to demonstrate how this local probing technique can be optimally used to investigate the corrosion behavior of inclusion containing austenitic stainless steels, different experimental parameters were varied one by one. The effect of different factors such as substrate potential, rate of scanning and concentration of chloride was studied in detail. The study shows that a scan rate of 0.32μm/s (3.2μm step distance for 10s hold time) for 50μm by 50μm scans and a scan rate of 0.1μm/s (1μm step distance for 10s hold time) for 20μm by 20μm scans produced optimum results throughout the study. ► MnS inclusions were studied by scanning electrochemical microscopy (SECM). ► We studied inclusions in austenitic stainless steels by varying different factors. ► Scan rate of 0.1μm/s is ideal for 20×20μm scans. ► Scan rate of 0.32μm/s is ideal for 50×50μm scans. ► Lower potentials and mild environments lead to lower initiation and growth of pitting.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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