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Electrochemical and Mechanical Studies of Epoxy Coatings Containing Eco-Friendly Nanocomposite Consisting of Silane Functionalized Clay–Epoxy on Mild Steel

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Abstract

In this study, new clay/silane/epoxy nanocomposites (CSE nanocomposite) were fabricated to enhance the corrosion resistance of epoxy resin. The surface of the clay is modified using 3-aminopropyltriethoxysilane (APTES). The functionalized clay nanoparticle was characterized by Fourier-transform infrared spectroscopy, and thermogravimetric analysis. The fabricated clay nanocomposites coated mild steel was evaluated by electrochemical impedance spectroscopy, scanning electrochemical microscopy and X-ray diffraction (XRD) studies in 3.5% NaCl solution for various days. The experiments indicated that the best epoxy coating performance was obtained by the incorporation of functionalized clay nanoparticles 4 wt% in the epoxy resin. The coated mild steel by CSE nanocomposites showed higher coating resistance (Rc = 238,967 Ω cm2) than that of neat epoxy coating (Rc = 129,532 Ω cm2). Mechanical properties of the coatings were also found to be improved in the presence of modified clay nanoparticle in tensile and hardness measurements. The use of nanoclays enhanced the anticorrosive behavior and physical integrity of the polymer–clay coatings under immersion tests. The surface morphology of the coated sample was analyzed by field-emission scanning electron microscopy and energy-dispersive X-ray spectroscopy. XRD analysis confirms the formation of metal complexes as the corrosion products at 40 days of immersion in 3.5% NaCl solution.

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Authors and Affiliations

  1. Department of Chemistry, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Avadi, Chennai, Tamil Nadu, 600 062, India

    J. Raja Beryl & Joseph Raj Xavier

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  1. J. Raja Beryl
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  2. Joseph Raj Xavier
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Correspondence to Joseph Raj Xavier.

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Beryl, J.R., Xavier, J.R. Electrochemical and Mechanical Studies of Epoxy Coatings Containing Eco-Friendly Nanocomposite Consisting of Silane Functionalized Clay–Epoxy on Mild Steel. J Bio Tribo Corros 6, 126 (2020). https://doi.org/10.1007/s40735-020-00424-0

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  • DOI: https://doi.org/10.1007/s40735-020-00424-0

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