纳米SiO2-氧化石墨烯/环氧涂层的制备及其防腐蚀性能

采用改进Hummers法制备了氧化石墨烯（GO），并将GO与经硅烷偶联剂γ-氨丙基三乙氧基硅烷（KH550）改性的纳米SiO₂进行复合，制备出纳米SiO₂-GO。通过FTIR、XRD、SEM、TEM等分析手段对SiO₂-GO进行表征。采用机械搅拌与超声分散的方法将SiO₂-GO添加到环氧树脂（EP）中。对添加不同质量分数纳米SiO₂、GO和纳米SiO₂-GO的EP基复合材料涂层的物理性能和电化学性能进行测试。结果表明，与纯EP涂层相比，SiO₂/EP、GO/EP和纳米SiO₂-GO/EP复合材料涂层的硬度、附着力和耐腐蚀性能得到显著增强，其中加入2wt%纳米SiO₂-GO/EP复合材料涂层硬度达到5 H，附着力等级达到1级，浸泡24 h后涂层保护效率为99.33%。15天浸泡试验结果表明，添加1.5wt%纳米SiO₂-GO/EP复合材料涂层的硬度达到5 H，附着力达到1级，涂层保护效率仍能达到97.12%。

Preparation and corrosion resistance of nano SiO2-graphene oxide/epoxy composite coating

Graphene oxide (GO) was prepared by modified Hummers method, and nano SiO₂-GO was prepared by combining GO with nano SiO₂, which modified by silane coupling agent γ-aminopropyltriethoxysilane(KH550). The nano SiO₂-GO was characterized by FTIR, XRD, SEM and TEM. The nano SiO₂-GO was added to the epoxy resin(EP) coating by mechanical mixing and ultrasonic dispersion.The physical properties and electrochemical properties of the coatings with different mass fraction of nano SiO₂, GO and nano SiO₂-GO composites were tested. The results show that compared with the pure EP coating, the hardness, adhesion and corrosion resistance of nano SiO₂/EP, GO/EP and nano SiO₂-GO/EP are obviously enhanced. The hardness of the coating with 2wt% nano SiO₂-GO is 5 H, the adhesion grade reaches 1, and the protection efficiency is 99.33% after immersion 24 h. The results of 15 days immersion test show that the coating hardness of 1.5wt% nano SiO₂-GO/EP reaches 5 H, the adhesion grade is 1, and the protection efficiency still remain at 97.12%.