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Electrochemical Properties of Epoxy, Fusion Bonded Epoxy and Conducting Polyaniline Based Coatings on Low Carbon Steel under Cathodic Protection

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Abstract

Impressed current cathodic protection system in association with organic coatings is used for the protection of engineering structures such as buried pipe lines. However, the organic coating degrades with the function of time. Inherently or intrinsically conducting polymers have been emerged as promising materials for making anti-corrosion coatings on the active metals and alloys. In this work, epoxy, fusion bonded epoxy and conducting polyaniline based paints were applied on low carbon steel samples. Electrochemical studies was carried out using potentiodynamic polarization, open circuit potential measurements and electrochemical impedance spectroscopy in 3.5% NaCl solution. The corrosion rate of conducting polyaniline based painted low carbon steel by using platinum as a counter electrode was found to be 0.1 mpy which is about 82 times lower than uncoated low carbon steel, 9 times lower than epoxy coated low carbon steel and 6 times lower than fusion bonded epoxy coated low carbon steel. Conducting polyaniline coated low carbon steel samples offered higher impedance (Zmod), coating resistance (Rc), charge transfer resistance (Rct), lower coating capacitance (Cc) after 48 h of immersion in 3.5% NaCl solution without impressed current cathodic protection and under impressed current cathodic protection.

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ACKNOWLEDGMENTS

The author thanks Prof. S.P. Butee, Head, Department of Metallurgy and Materials Science, College of Engineering, Pune, 411005 (M.S.) India for providing facilities for the work and Prof. B.B. Ahuja, Director, College of Engineering, Pune, 411005 (M.S.) India for his encouragement.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Dr. D. Y. Patil Institute of Engg. Management and Research, 411044 (M.S), Pune, Akurdi, India

    Aniket Kolekar

  2. Department of Metallurgy and Material Science, College of Engineering, 411005 (M.S), Pune, India

    Pravin Deshpande

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  1. Aniket Kolekar
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  2. Pravin Deshpande
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Correspondence to Aniket Kolekar or Pravin Deshpande.

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Aniket Kolekar, Pravin Deshpande Electrochemical Properties of Epoxy, Fusion Bonded Epoxy and Conducting Polyaniline Based Coatings on Low Carbon Steel under Cathodic Protection. Russ J Electrochem 59, 546–559 (2023). https://doi.org/10.1134/S1023193523070042

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  • DOI: https://doi.org/10.1134/S1023193523070042

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