Preparation of Poly(o-toluidine)/Nano ZrO2/Epoxy Composite Coating and Its Application for Corrosion Protection of Steel

The main objective was to study the anticorrosion performance of poly(o-toluidine)/nano ZrO2/epoxy composite coating.Poly(o-toluidine)/nano ZrO2composite was prepared by in situ polymerization of o-toluidine monomer in the presence of nano ZrO2particles.Fourier transformation infrared spectroscopy(FT-IR),UV-visible spectroscopy(UV-vis),X-ray diffraction(XRD),Scanning electron microscopy(SEM),and Thermogravimetric analysis(TGA) were used to characterize the composition and structure of the composite.Poly(o-toluidine)/nano ZrO2composite was mixed with epoxy resin through a solution blending method and the three components poly(o-toluidine)/nano ZrO2/epoxy composite coating was coated onto the surface of steel sample by the brush coating method.The anticorrosion performance of poly(o-toluidine)/nano ZrO2/epoxy composite coating on steel sample was studied by polarization curve and electrochemical impendence spectroscopy in 3.5% Na Cl solution as corrosion environment and also compared with that of poly(o-toluidine)/epoxy composite coating and pure epoxy coating.It was observed that the composite coating containing poly(otoluidine)/nano ZrO2composite has got higher corrosion protection ability than that of poly(o-toluidine).The electrochemical measurement results demonstrated that poly(o-toluidine) fillers improve the electrochemical anticorrosion performance of epoxy coating and the addition of nano ZrO2particles increases the tortuosity of the diffusion pathway of corrosive substances.