Hybrid Silicone-Epoxy Coating Reinforced with Silanized Graphene Oxide Nanosheets with Improved Anti-Corrosion Performance

Wednesday, 16 May 2018: 10:50
Room 304 (Washington State Convention Center)
X. Chen, Z. Yue, X. Yuan, S. Wen, Z. Liu, and T. Feng (Northwestern Polytechnical University)
Silane coating is a frequently applied strategy to promote the adhesion between a substrate and an organic coating. However, the corrosion protection properties of this coating are not sufficient. Incorporation of various additives and nano-fillers into the coating is a promising way to improve the coating barrier property. In this paper a new nano-filler based on graphene oxide (GO) is fabricated with the silane-functionalized grapheme oxides (SF-GO). The graphene oxide is silanized in the first step through a sol–gel route by using aminopropyl triethoxysilane (ATPES) 、Triethoxyvinylsilane (VTES)and tetraethyl orthosilicate (TEOS). Then, it is employed in an organic-inorganic hybrid coating based on the mixture of TEOS and silicone-epoxy coating. The GO functionalization was characterized by Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The hybrid coating filled with silanized and untreated GO were also characterized by FT-IR, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results obtained from different characterizations showed successful silanization and dispersion of SF-GO in the hybrid coating. The hybrid silicone-epoxy coating containing SF-GO showed superior corrosion protective performance compared to the unfilled silane coating in electrochemical impedance spectroscopy (EIS) and polarization measurements, indicating the considerable corrosion barrier effect of the nano-filler. Moreover, the bonding strength of the composites was strengthened and the deformation were identified and evaluated.