1. Highly dispersed polyaniline/graphene oxide composites for corrosion protection of polyvinyl chloride/epoxy powder coatings on steel.
- Author
-
Han, YuYing, Liu, ZiLiang, Wang, Shuang, Wang, Wenxue, Wang, ChuanXing, and Gao, ChuanHui
- Subjects
EPOXY coatings ,GRAPHENE oxide ,POLYVINYL chloride ,POWDER coating ,POLYANILINES ,FOURIER transform infrared spectroscopy ,SELF-healing materials ,STEEL corrosion - Abstract
In this study, a novel functionalized graphene oxide(GO) sheet of polyaniline(PANI) was prepared by in situ polymerization of aniline. Fourier transform infrared spectroscopy (FTIR), X-ray diffractometer (XRD) and scanning electron microscope (SEM) indicated the successful polymerization of aniline on GO tablets, and PANI was uniformly inserted into the GO lamellas that benefited the dispersion of PAGO. The anticorrosion properties of PAGO-PVC/EP coatings with different contents were analyzed and compared with PAGO-0 and the GO coatings. Electrochemical analysis showed that an appropriate amount of PAGO (0.5wt%) could significantly improve the long-term corrosion resistance of the coating. Its excellent corrosion resistance was attributed to two parts: (1) PAGO had good dispersion and could improve the barrier property of the coating to block H
2 O, O2 and electrolytes from penetrating to the steel substrate; (2) PANI with complete electrical activity could timely transfer the electrons lost from the base to the coating surface, and form a passivation film composed of Fe3 O4 and Fe2 O3 by induction. The barrier property of GO and the self-healing ability of PANI made PAGO-based PVC/EP coatings excellent in corrosion resistance. [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF