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<p>Anti-corrosion epoxy coatings are commonly useful for shielding fuel storage reservoir; however, conventional epoxy systems frequently comprise of defects that compromise their long-term performance. In this study, we present a new set of anticorrosive coatings based on epoxidized silkworm pupae oil strengthened with acid-functionalized multi-walled carbon nanotubes (ESPO/a-MWCNTs). Silkworm pupae oil (SPO), abundant in unsaturated fatty acids, undergo epoxidation to form a polymer system appropriate for coating applications. The a-MWCNTs were homogenously distributed in the epoxidized oil and applied onto mild steel (MS) substrates via dip-coating, followed by thermal curing. The morphology and uniformity of the coatings were studied using SEM and AFM analysis. The corrosion resistance of the coatings was assessed using electrochemical techniques, including electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) studies. The epoxy/a-MWCNTs composite coating exhibited a higher coating resistance (R<sub>coat</sub>) value of 2.26 × 10<sup>5</sup> Ω.cm<sup>2</sup> and having lower corrosion rate of 0.1625 mil/year in 3.5 wt% NaCl solution. The results validate that the integration of a-MWCNTs significantly progresses the barrier properties of the coating by decreasing pore development during curing and hindering the diffusion of corrosive ions.</p>

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Electrochemical assessment of epoxy/ a-MWCNTs composite anticorrosive coatings on mild steel substrates

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Nandhini Dhanavel,
  • Viswanatha Ramarao

摘要

Anti-corrosion epoxy coatings are commonly useful for shielding fuel storage reservoir; however, conventional epoxy systems frequently comprise of defects that compromise their long-term performance. In this study, we present a new set of anticorrosive coatings based on epoxidized silkworm pupae oil strengthened with acid-functionalized multi-walled carbon nanotubes (ESPO/a-MWCNTs). Silkworm pupae oil (SPO), abundant in unsaturated fatty acids, undergo epoxidation to form a polymer system appropriate for coating applications. The a-MWCNTs were homogenously distributed in the epoxidized oil and applied onto mild steel (MS) substrates via dip-coating, followed by thermal curing. The morphology and uniformity of the coatings were studied using SEM and AFM analysis. The corrosion resistance of the coatings was assessed using electrochemical techniques, including electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) studies. The epoxy/a-MWCNTs composite coating exhibited a higher coating resistance (Rcoat) value of 2.26 × 105 Ω.cm2 and having lower corrosion rate of 0.1625 mil/year in 3.5 wt% NaCl solution. The results validate that the integration of a-MWCNTs significantly progresses the barrier properties of the coating by decreasing pore development during curing and hindering the diffusion of corrosive ions.