Epoxy resins and their zinc composites as novel anti-corrosive materials for copper in 3% sodium chloride solution: Experimental and computational studies

This study reports the evaluation of the anticorrosive performance of two macromolecular aromatic epoxy resins (ERs), namely, tetra glycidyl of ethylene dianiline (TGEDA) and hexaglycidyl Tris (p-ethylene dianiline) phosphoric triamide (HGEDPAT) and their polymer composite reinforced with Zinc for copper corrosion in 3% NaCl using the computational and experimental analyses. Electrochemical results showed that HGEDAPT cured with methylene dianiline (MDA) showed better protection efficiency with optimum corrosion current density (icorr) value of 2.0 μ cm−2 and the polarization resistance (Rp) value of 17.00 kΩ·cm2 than that of TGEDA-MDA having icorr value of 2.4 μ cm−2 and the Rp value of 15.24 kΩ·cm2. The anti-corrosive effect of TGEDA-MDA and HGEDAPT-MDA was evaluated in the presence of 5% zinc (Zn). Experimental results demonstrate that the presence of 5% of zinc in TGEDA-MDA and HGEDAPT-MDA formulations significantly enhanced their protection ability. The anticorrosive effect of the different formulations followed the order: ER1 (TGEDA-MDA) (potentiodynamic polarization (PDP); 90% and electrochemical impedance spectroscopy (EIS) 92%)