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

Authors

1 Department of Physical Chemistry,Electrochemistry Research Laboratorymistry, Tabriz university

2 Department of Materials Science and Nanotechnology, Engineering Faculty, Near East University

Abstract

In this research, ZnO nanoparticles modified with imidazole in O-xylene solution and characterized with Fourier transform infrared FTIR spectroscopy. Then, polyaniline-ZnO unmodified and imidazole modified nanocomposites were synthesized via in-situ emulsion polymerization method. The synthesized nanocomposites were characterized by FTIR and scanning electron microscopy SEM. The anti-corrosion 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 7.2×104 , 1.3×105 , 2.3×105 and 1.7×107 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.

Keywords

Progress in Color, Colorants and Coatings
Volume 10, Issue 3
July 2017
Pages 181-192

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