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Exploitation of natural gum exudates as green fillers in self-healing corrosion-resistant epoxy coatings

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Abstract

Recently, interest in developing green polymer coatings which provide self-healing and corrosion protection functions using bio-based renewable materials has significantly increased. In this study, microcapsules containing biopolymers from cashew gum and gum Arabic have been prepared by interfacial polymerization. The prepared microcapsules were individually and combinatorially embedded into epoxy coatings and the resulting composite coatings were then applied on Q235 steel substrates. The performance of the composite coatings was evaluated by immersing both scribed and unscribed coatings in simulated seawater. Surface analytical (SEM), physico-chemical (FTIR, XRD, XPS), and electrochemical impedance spectroscopy (EIS) techniques were used to investigate self-healing and corrosion resistance effectiveness of the polymer composite coatings. The obtained results revealed that cashew gum and gum Arabic could heal the scribed coating surface and subsequently suppressed corrosion reaction, without the aid of any catalyst or co-reactant. The performance was observed to be higher when the two gum exudates were combined. Thus, cashew gum and gum Arabic have demonstrated that they possess properties required for potential utilization in the formulation of marine anticorrosion and self-healing epoxy coatings.

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Acknowledgments

The Africa Centre of Excellence in Future Energies and Electrochemical Systems (ACE-FUELS), Federal University of Technology Owerri, Nigeria, is greatly appreciated for research support. Also, the authors are grateful to the Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China, where the XPS and XRD analyses where conducted.

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Authors and Affiliations

  1. Department of Polymer and Textile Engineering, Federal University of Technology, P.M.B, Owerri, 1526, Nigeria

    Innocent O. Arukalam & Henry C. Obasi

  2. Department of Polymers and Advanced Composites, Sheda Science and Technology Complex (SHESCO), Abuja, Nigeria

    Edith Y. Ishidi

  3. Department of Polymer and Textile Engineering, Nnamdi Azikiwe University, Awka, Nigeria

    Izuchukwu O. Madu & Obumneme E. Ezeani

  4. Department of Polymer and Textile Technology, Yaba College of Technology, Lagos, Nigeria

    Macauly M. Owen

Authors
  1. Innocent O. Arukalam
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  2. Edith Y. Ishidi
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  4. Izuchukwu O. Madu
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  5. Obumneme E. Ezeani
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Contributions

IOA designed the experiment, conducted the EIS experiments and wrote the manuscript, EYI conducted the FTIR analysis in her laboratory, HCO analyzed the XRD and XPS results, IOM and OEE collected the gum exudates and conducted experiment on the encapsulation of the gum exudates, while MMO conducted the SEM examination. All authors read and approved the final manuscript.

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Correspondence to Innocent O. Arukalam.

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Arukalam, I.O., Ishidi, E.Y., Obasi, H.C. et al. Exploitation of natural gum exudates as green fillers in self-healing corrosion-resistant epoxy coatings. J Polym Res 27, 80 (2020). https://doi.org/10.1007/s10965-020-02055-y

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  • DOI: https://doi.org/10.1007/s10965-020-02055-y

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