Surface Modification Of Carbon Fiber By Graphene Oxide And Properties Of Resin Matrix Composites

It is urgent to explore the environmental protection and efficient corrosion resistant coatings.This paper intends to prepare waterborne anticorrosive coatings by using graphene and inorganic particle modified waterborne epoxy emulsion.The physical and chemical properties of coatings were tested,and their microstructure and corrosion mechanism were characterized.First,the f-Si₃N₄@RGO/epoxy anticorrosive coating was prepared by using graphene and silicon nitride?Si₃N₄?particles.And the microstructure,chemical composition and crystal structure of f-Si₃N₄@GO and f-Si₃N₄@RGO hybrid materials were characterized by SEM,FTIR and XRD.The|Z|_0.1.1 Hz value of 2 wt.%f-Si₃N₄@RGO coating was about 1.55×10⁴ cm².The value was much higher than that of pure epoxy and 2 wt.%f-Si₃N₄/epoxy coatings.The anticorrosive performance of the f-Si₃N₄@RGO coating was significantly enhanced.These excellent corrosion resistance is determined by the typical ultrathin RGO nano-sheet assembled f-Si₃N₄ structure composite,which is conducive to the uniform dispersion of RGO and Si₃N₄ in waterborne epoxy matrix.The conductive particle ATO were mixed with f-SiO₂@GO and f-SiO₂@RGO to prepare waterborne epoxy anticorrosive coatings,and the antiseptic performance and antistatic properties were studied.In the ATO/f-SiO₂@RGO/epoxy resin coating,the surface roughness of SiO₂ can be increased by adding the plicated RGO.After the reduction of f-SiO₂@GO,the conductivity was restored and the good dispersion of f-SiO₂@RGO was maintained,making the evenly dispersed f-SiO₂@RGO to formate a conductive network,which can further improve the conductivity and corrosion resistance.The result shows that the|Z|_0.1.1 Hz value of ATO/f-SiO₂@RGO/coating was about 4.12×10⁵ cm².The value was much higher than that of5 wt.%other fillers in coating.The anticorrosive performances of ATO/f-SiO₂@RGO/epoxy coating were significantly enhanced.This superior core-shell f-SiO₂@RGO straticulate structure and ATO particles can make full use of the enhancement effect of different components to endow waterborne epoxy coatings with outstanding corrosion resistance and antistatic properties.Moreover,the effects of SiO₂,f-SiO₂,f-SiO₂@RGO,f-SiO₂@RGO,ATO and CNTs on antistatic anticorrosion properties of composite coatings were studied.A high-performance ATO/CNTs/f-SiO₂@RGO/epoxy coatings was prepared.Research shows that when the dosage of ATO was 10wt.%,and the content of CNTs was 2wt.%,the surface resistivity values of f-SiO₂@GO and f-SiO₂@RGO composite are 5.97x10⁴???and 1.04x10⁴???,respectively,which the surface resistivities decrease eight orders of magnitude than pure epoxy coating and the conductivity and interface properties of the composites are improved.As compared with pure epoxy or other fillers coatings,the ATO/CNTs/f-SiO₂@RGO/epoxy composite coating has good dispersibility and can be closely combined with the resin,preventing the electrolyte from entering the micropore.Therefore,it is possible to make full use of this superior core-shell structure of f-SiO₂@RGO to enhance the effect by mixing with different components,so as to endow the waterborne epoxy coating with a comprehensive protective performance.