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Lipika Rani Bairi,Darothi Bairagi,Partha Duley,Sumantra Mandal 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.7
The current study investigates the effect of long-term immersion on the corrosion response and the consequent passive filmformation process of lean duplex stainless steel 2101 in 3.5 wt% NaCl solution. The corrosion behavior of the alloy has beenmonitored through long term immersion tests at different time intervals, viz. 0, 3, 5, 10, 20, 40, and 70 days. The electrochemicaltests, such as potentiodynamic polarization and electrochemical impedance spectroscopy, have been performedafter each immersion period to understand the change in corrosion rate and passivation behaviour, respectively, with respectto immersion duration. With the increase in immersion duration, the pitting potential (Epit) gradually shifts towards a noblerdirection with a simultaneous reduction in corrosion rate (rcorr). This has been attributed to the gradual increase in the thicknessof the passive film with the increase in duration of immersion, as revealed through the EIS analysis. The passive filmis found to become nearly stable after 40 days of immersion of the specimen in 3.5 wt% NaCl solution. Interestingly, thethickness and stability of the passive film obtained after 40 days of immersion in 3.5 wt% NaCl solution are comparable tothe passive film that is formed in mildly passivating media, namely borate buffer solution. An investigation of post immersionsurface morphology has also confirmed the gradual improvement in the uniformity and compactness of the oxide-richpassive layer with increase in immersion period, which eventually led to improved corrosion resistance of the alloy in thesaline environment.
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