Preparation of Polyaniline/Nano SiC/Epoxy Hybrid Coating and Evaluation of its Corrosion Resistant Property

By : Chuanbo Hu, Yushi Dinga, Beiyue Ma, Ying Li, Yansheng Zheng

Page No: 1-15

Abstract
In this investigation, polyaniline/nano SiC composites were prepared by in situ polymerization of aniline monomer in the presence of nano SiC particles. X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier transformation infrared spectroscopy (FT-IR), UV-visible spectroscopy (UV-vis) and Thermogravimetric analysis (TGA) were used to characterize the composition and structure of the composite. Polyaniline/nano SiC composite was mixed with epoxy resin through a solution mixing method and the hybrid coating was coated onto the surface of steel coupon. Then its corrosion resistance was evaluated by electrochemical measurements and immersion test in 3.5% NaCl solution as corrosion environment. The results showed that polyaniline/nano SiC composite containing coating has higher corrosion resistance than that of polyaniline. The enhancement of corrosion protection efficiency of polyaniline/nano SiC composite containing coating is due to the formation of more uniformly passive film on steel surface and the addition of nano SiC particles increases the tortuosity of the diffusion pathway of corrosion substances.

Authors :
Chuanbo Hu, Yushi Dinga, Beiyue Ma and Ying Li : School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China
Yansheng Zheng : College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China.