TiO_2-GO的制备及TiO_2-GO/环氧树脂涂层的抗腐蚀性能

为了提高环氧树脂涂层的抗腐蚀性能,首先,利用改进的Hummers法制备了氧化石墨烯(GO)。然后,将3-氨基丙基三乙氧基硅烷(KH550)改性纳米TiO2负载在GO表面,制备了改性纳米TiO2与GO的复合颗粒(TiO2-GO),通过FTIR、XRD和SEM对TiO2-GO进行了表征。最后,将TiO2-GO分散于环氧树脂中,分别制备出TiO2-GO含量为1wt%、2wt%和3wt%的TiO2-GO/环氧树脂涂层及纯环氧树脂涂层,通过SEM观察了涂层断面形貌,利用电化学工作站和高温高压抗腐蚀测试表征了涂层的防腐蚀性能。结果表明:纳米TiO2通过化学键与GO结合在一起,将TiO2-GO分散于环氧树脂涂层中可以显著提高环氧树脂涂层的抗腐蚀性能。研究为通过添加GO的方法改善环氧树脂涂层的防腐性能提供了参考。

Preparation of TiO2-GO and anti-corrosion performances of TiO2-GO/epoxy coatings

In order to enhance the anti-corrosion performances of epoxy coatings, first, graphene oxide (GO) was prepared by modified Hummers method. Then, by loading 3-aminopropyltriethoxysilane (KH550) modified nano-TiO₂ on the surface of GO, composite particles of modified nano-TiO₂ and GO (TiO₂-GO) were prepared, and TiO₂-GO were characterized by FTIR, XRD and SEM. Finally, the TiO₂-GO were dispersed in epoxy, and TiO₂-GO/epoxy coatings whose TiO₂-GO contents were 1wt%, 2wt% and 3wt% and pure epoxy coatings were fabricated, respectively. The fracture surface morphologies of coatings were observed by SEM, and the anti-corrosion performances of coatings were characterized by electrochemical workstation and high temperature and high pressure corrosion test. The results demonstrate that nano-TiO₂ connects with GO by chemical bond, and dispersing TiO₂-GO in epoxy coating can evidently enhance the anti-corrosion performances of epoxy coatings. The research provides references for improving the anti-corrosion performances of epoxy coatings by means of adding GO.