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Cascade e-Ion PlasmaTM: A Novel Technique for Enhancing Corrosion Resistance of Medium Carbon Low Alloy Steel

  • Surface Engineering for Improved Corrosion or Wear Resistance
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Electrochemical properties of cascade e-ion plasmaTM -treated and plasma-nitrided 4140 steel were investigated using surface characterization and electrochemical methods. Scanning electron microscopy, X-ray diffraction technique, and X-ray photoelectron spectroscopy revealed the formation of a compound layer and oxide layer on the surface of the plasma-nitrided and cascade e-ion plasmaTM-treated steel, respectively. Open circuit potential measurements indicated a better corrosion protection ability of the cascade e-ion plasmaTM treatment than plasma-nitriding with an anodic protection mechanism. The corrosion rate of the cascade e-ion plasmaTM-treated steel was 0.09 mpy, which is substantially lower than that of untreated steel. Electrochemical impedance spectroscopy supported the potentiodynamic investigations and indicated long-term protection. The composite layer of iron oxides and complex nitrides generated during cascade e-ion plasmaTM treatment protects the steel by inhibiting the transport of reacting species. The superhydrophobic surface topography of the cascade e-ion plasmaTM-treated steel seems to be contributing to the overall protection.

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The authors are grateful to Dr. M.G. Kulthe, Head, Department of Metallurgy and Materials Engineering, COEP Technological University, Pune for providing facilities, and Prof. Sudhir Agashe, Vice Chancellor, COEP Technological University, Pune for his continuous encouragement.

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Correspondence to Swapnil S. Deshpande.

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Deshpande, S.S., Deshpande, P.P. & Rathod, M.J. Cascade e-Ion PlasmaTM: A Novel Technique for Enhancing Corrosion Resistance of Medium Carbon Low Alloy Steel. JOM 76, 268–276 (2024).

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