Aqueous corrosion performance of nanostructured bainitic steel

Kazum, O., Mathan, M. Bobby, Beladi, H., Timokhina, I.B., Hodgson, P.D., and Khoddam, S. (2014) Aqueous corrosion performance of nanostructured bainitic steel. Materials & Design, 54. pp. 67-71.

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Abstract

In this study, the corrosion performance of nanostructured bainitic steel was compared with martensitic steel in chloride-containing solution using electrochemical techniques. Electrochemical impedance spectroscopy (EIS) results showed that the polarization resistance (Rp) for nanostructured bainitic steel (3400 Ω cm2) was higher than that of martensitic steel (2000 Ω cm2). Potentiodynamic polarization results showed an 85% lower corrosion current density for nanostructured bainitic steel compared to martensitic steel. Galvanostatically polarized martensitic steel revealed high localized corrosion i.e., intergranular corrosion (IGC) as well as localized attack in the grains. However, the nanostructured bainitic steel when polarized galvanostatically exhibited only a marginal selective dissolution of retained austenite. Thus, it can be suggested that nanostructured bainitic steel will perform better than martensitic steel in chloride-containing environments.

Item ID: 29208
Item Type: Article (Research - C1)
ISSN: 1873-4197
Date Deposited: 08 Sep 2013 22:43
FoR Codes: 09 ENGINEERING > 0912 Materials Engineering > 091207 Metals and Alloy Materials @ 100%
SEO Codes: 86 MANUFACTURING > 8611 Basic Metal Products (incl. Smelting, Rolling, Drawing and Extruding) > 861103 Basic Iron and Steel Products @ 100%
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