Insitu electrochemical synthesis of Polyaniline/Graphene Nanocomposite Coatings for surface protection of mild steel

摘要

Due to chemically inert and high durability, graphene based materials as a corrosion protection coating have generated interest among researchers and makes new insight to develop anticorrosive coating layers on a metal substrate. In this current study, effective attempt of constructing nanocomposite comprised of polyaniline (PANI) and functionalized graphene oxides (GO) has been done for the purpose of corrosion protection of mild steel (MS). The synthesized nanocomposites were investigated in terms of morphology, chemical structure and thermal stability with scanning electron microscope (SEM), Attenuated total reflectance infrared (ATR-IR) and thermal gravimetric analysis (TGA) methods, respectively. SEM investigations evidenced uniform morphology in PANI/GO nanocomposites with nanometer-sized diameters. The corrosion performance was studied in 3.5% NaCI solution by electrochemical impedance spectroscopy and potentiodynamic measurements. The origin of such enhanced corrosion protection property is explained from view point that the interfacial interactions between functionalized GO and PANI matrix, greatly improves at the polymer/filler bond stability resulting in a better corrosion performance.