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纳米SiO2-氧化石墨烯/环氧涂层的制备及其防腐蚀性能

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

    摘要
  • 摘要: 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%。

     

    Abstract: 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%.

     

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