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

胡传波^1,2，郑燕升^1,3，QING Yongquan^1,2，WANG Falong¹，MO Chunyan¹，MO Qian¹

1. College of Biological and Chemical Engineering,Guangxi University of Science and Technology2. School of Metallurgy,Northeastern University3. Lushan College,Guangxi University of Science and Technology

摘 要：The main objective was to study the anticorrosion performance of poly（o-toluidine）/nano ZrO₂/epoxy composite coating.Poly（o-toluidine）/nano ZrO₂ composite was prepared by in situ polymerization of o-toluidine monomer in the presence of nano ZrO₂ particles.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 ZrO₂ composite 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 ZrO₂ composite 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 ZrO₂ particles increases the tortuosity of the diffusion pathway of corrosive substances.

关键词：