electrochemical evaluation of corrosion protection performance of epoxy/polyaniline-imidazole modified zno nanocomposite coating on mild steel

In this research, zno nanoparticles modified with imidazole in oxylene solution and characterized with fourier transform infrared ft-ir spectroscopy. then, polyaniline-zno unmodified and imidazole modified nanocomposites were synthesized via in-situ emulsion polymerization method. the synthesized nanocomposites were characterized by ft-ir and scanning electron microscopy sem. the anticorrosion behavior of the epoxy coating in the presence of unmodified zno, imidazole modified zno, polyaniline-zno unmodified and imidazole modified were studied in nacl 3.5 wt solution at 65 ℃ for 100 h by electrochemical impedance spectroscopy eis. the coating resistance rcoat of epoxy coating containing unmodified zno, imidazole modified zno, polyaniline/ unmodified zno and polyaniline/ imidazole modified zno after 100 h immersion in saline electrolyte found to be 7.2×10^4 , 1.3×10^5 , 2.3×10^5 and 1.7×10^7 ω cm², respectively. it can be seen that polyaniline/ imidazole modified zno nanocomposite exhibited higher corrosion resistance and provided better barrier properties against ingress of corrosive electrolyte.