Liu Ruidan, Liu Xiaoyan, Yang Heng, Jie Handuo, Li Tianyu, Lyu Kai, Shah Surendra P
College of Mechanics and Materials, Hohai University, Nanjing 210098, China.
Institute of Corrosion Protection, Hohai University, Nanjing 210098, China.
Polymers (Basel). 2022 Aug 30;14(17):3573. doi: 10.3390/polym14173573.
The lamellar structure of graphene oxide and the filling effect of nano-cerium oxide particles together provide a good barrier and stability to coating. In this paper, cerium oxide-graphene oxide (4:1) nanocomposite was prepared by the hydrothermal synthesis method. The effect of cerium oxide-graphene oxide (4:1) nanocomposite on the anticorrosion properties of epoxy coating in simulated acid rain solution was studied by open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), Mott-Schottky curve, Tafel curve, and micromorphological characterization, in order to compare it with pure epoxy coating, graphene oxide epoxy coating, and cerium oxide epoxy coating. The obtained results showed that cerium oxide-graphene oxide (4:1) epoxy coating's protection efficiency was as high as 98.62%. These results indicated that cerium oxide-graphene oxide modified anticorrosive coating had an excellent application prospect in an acid rain environment. Meanwhile, owing to the poor protection ability of epoxy resin and unstably hydrolysis product of CeO to the acidic medium, the resistance of CeO-GO (4:1)/EP coating to acidic corrosive medium was relatively poorer than that of neutral and saline-alkali corrosive medium.
氧化石墨烯的层状结构与纳米氧化铈颗粒的填充作用共同为涂层提供了良好的阻隔性和稳定性。本文采用水热合成法制备了氧化铈-氧化石墨烯（4:1）纳米复合材料。通过开路电位（OCP）、电化学阻抗谱（EIS）、莫特-肖特基曲线、塔菲尔曲线和微观形貌表征等方法，研究了氧化铈-氧化石墨烯（4:1）纳米复合材料对模拟酸雨溶液中环氧涂层防腐性能的影响，以便与纯环氧涂层、氧化石墨烯环氧涂层和氧化铈环氧涂层进行比较。所得结果表明，氧化铈-氧化石墨烯（4:1）环氧涂层的保护效率高达98.62%。这些结果表明，氧化铈-氧化石墨烯改性防腐涂层在酸雨环境中具有优异的应用前景。同时，由于环氧树脂的保护能力较差以及CeO水解产物对酸性介质不稳定，CeO-GO（4:1）/EP涂层对酸性腐蚀介质的抗性相对低于中性和盐碱腐蚀介质。
