In-situ synthesis of Zn doped polyaniline on graphene oxide for inhibition of mild steel corrosion in 3.5 wt.% chloride solution

摘要

In this study, the negatively charged graphene oxide (GO) nanosheets were modified with polyaniline (PAni) nanofibers and zinc cations through a layer-by-layer assembly method. The structure, morphology and thermal behavior of GO, GO-PAni and GO-PAni-Zn were characterized. The active corrosion inhibition performance of GO-PAni-Zn nanocomposite was demonstrated by electrochemical impedance spectroscopy (EIS) and polarization tests. The results confirmed high cation exchange capability and better anti-corrosion properties of GO-PAni-Zn sample than others. The theoretical outcomes derived from quantum mechanics computations revealed that inorganic zinc cations demonstrated electrostatic and cation-it interactions with emeraldine, implying the zinc propensity to bind to PAni Chains. (C) 2018 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.