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Evaluation of the Corrosion Protection Performance of Epoxy-Coated High Manganese Steel by SECM and EIS Techniques

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Abstract

The corrosion protection performances of epoxy-coated Mn steel and carbon steel were evaluated by electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscopy (SECM) analysis. EIS was performed on coated Mn steel with a scratch in a 0.1 M NaCl solution after a wet/dry cyclic corrosion test. The charge transfer resistance (R ct) and film resistance (R f) of the coated Mn steel displayed a higher value than the coated carbon steel. The increase in the charge transfer resistance and film resistance of the coated steel is due to the presence Mn in steel. SECM was conducted to estimate the corrosion protection performance of the epoxy-coated Mn steel immersed in a 0.1 M NaCl solution. It was found that dissolution of Fe2+ was suppressed at the scratch on the coated Mn steel due to the higher resistance for anodic dissolution of the substrate. SEM/EDX analysis showed that Mn was enriched in corrosion products at a scratched area of the coated steel after corrosion testing. FIB-TEM analysis confirmed the presence of the nanoscale oxide layer of Mn in the rust of the steel, which had a beneficial effect on the corrosion resistance of the coated steel by forming protective corrosion products in the wet/dry cyclic test.

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  1. Research Center for Strategic Materials, Materials Recycling Design Group, National Institute for Materials Science, Tsukuba, Ibaraki, Japan

    X. Joseph Raj & T. Nishimura

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  1. X. Joseph Raj
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  2. T. Nishimura
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Correspondence to X. Joseph Raj.

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Raj, X.J., Nishimura, T. Evaluation of the Corrosion Protection Performance of Epoxy-Coated High Manganese Steel by SECM and EIS Techniques. J Fail. Anal. and Preven. 16, 417–426 (2016). https://doi.org/10.1007/s11668-016-0102-5

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  • DOI: https://doi.org/10.1007/s11668-016-0102-5

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