Abstract
Electrochemical polarization behavior of two newly developed ferritic-pearlitic railway axle steels (MS3 and MS6) and the standard Indian conventional axle steel has been studied in sodium borate buffer solution of pH 8.4 with and without the presence of NaCl. The polarization behavior of both the new axle steels shows close resemblance, whereas, different polarization behavior has been observed for the conventional axle steel. Electrochemical impedance spectroscopy measurements have clearly reflected significantly improved passivation behavior for the newly developed steels compared to that of the conventional axle steel. NaCl salt fog exposure tests have also shown superior corrosion resistance of the newly developed axle steels as compared to the conventional axle steel. Higher surface roughness on the corroded conventional axle steel has also been observed compared to the smoother surface in case of the new axle steels. Higher corrosion resistance of the new axle steels has been attributed to their finer microstructure and strongly adherent protective rusts.
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Authors would like to thank Mr. A. K. Mandal, Adl. Executive Director, RDSO (Retd.) for his kind assistance in procuring the material.
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Moon, A.P., Sangal, S., Srivastav, S. et al. Passivation and Corrosion Behavior of Modified Ferritic-Pearlitic Railway Axle Steels. J. of Materi Eng and Perform 24, 85–97 (2015). https://doi.org/10.1007/s11665-014-1252-9
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DOI: https://doi.org/10.1007/s11665-014-1252-9