氧化石墨烯涂层/基体系统界面结合性能研究

Investigation of interfacial bonding properties of graphene oxide coating/ substrate system

摘要:

文章采用试验和有限元模拟方法研究了不同氧化石墨烯含量的涂层/钢基体系统在海洋环境下的界面结合性能。通过结合数字图像相关法的拉伸试验，计算分析氧化石墨烯涂层的断裂强度、断裂韧性与界面剪切强度，并使用有限元方法模拟涂层/钢基体系统的表面与界面裂纹开裂过程。结果表明，随着氧化石墨烯添加量的增加，氧化石墨烯对涂层/钢基体系统界面结合性能的提升效果先增强后减弱，质量分数为0.3%的氧化石墨烯涂层在腐蚀后具有最优的界面结合性能，氧化石墨烯的添加对系统界面结合性能中涂层韧性的提升最为显著。

Abstract:

In this paper, the interfacial bonding properties of coating/steel substrate system with different graphene oxide (GO) content in marine environment were studied by experimental and finite element simulation methods. The fracture strength, fracture toughness and interfacial shear strength of the graphene oxide coating were calculated through the tensile test combined with the digital image correlation method (DIC). The finite element method was used to simulate the surface and interface cracking processes of the coating/steel substrate system. The results show that the enhancement effect of GO on the interfacial bonding properties of coating/ steel substrate system increases first and subsequently decreases with the addition of GO. Coating with 0.3wt% GO has the best interfacial bonding property after corrosion, and the addition of GO has the most significant improvement on the fracture toughness of the coating.