Influence of high entropy alloy nanoparticles coated with nitrogen-doped graphene layers on the anticorrosion performance of epoxy coatings

In this study, we incorporated nitrogen-doped graphene-coated high entropy alloy nanoparticles (HEA@NC NPs) with varying concentrations into epoxy resin (EP) to systematically investigate the effects of filler content, HEA cores, and graphene shells on the corrosion protection performance of the coating for mild steel. The experimental results indicate that optimal corrosion protection performance is achieved at a filler content of 0.5 wt. %. Both the core-shell structure and the HEA core play critical roles in enhancing the corrosion resistance of the composite coating. Notably, the composite coating filled with CuNiFeCoCrTi nanoparticles coated with 2–3 layers of nitrogen-doped graphene exhibits the best corrosion protection performance. When immersed in 3.5 wt. % NaCl solution for 30 days, the CuNiFeCoCrTi@NC/EP coating demonstrates an impressive impedance of |Zf| (at 0.01 Hz) measuring 3.76 × 108 Ω cm2, providing superior protection for the steel substrate.