Research progress in application of graphene oxide on metal surface and its mechanism

Due to its large specific surface area, excellent penetration resistance and a large number of functional groups distributed on the surface, graphene oxide(GO) has become a research hotspot in the fields of anticorrosion, permeation separation and coating mechanical properties. The research progress of GO application on metal surface in recent years was reviewed. On the basis of domestic and foreign literature, the research progress of GO applied on metal surface for anticorrosion, permeation separation, mechanical properties of coating and other aspects was described, and the mechanism was summarized and analyzed. The anticorrosion mechanism is mainly the physical barrier effect of GO and its chemical inertness to the electroactive medium. The mechanism of osmotic separation is mainly the multi-layer pore structure and functional groups of GO. The main mechanism of mechanical properties of the coating is the good compatibility between GO and coating and the formation of chemical bond between surface functional groups and metal matrix. It was pointed out that there is still a lack of GO composite preparation technology that meets the requirements of environmental protection, low cost and large-scale industrialization, the technological parameters involved, the design of composite phase system and other aspects still need further study. It was also proposed to be applied to metal anticorrosion, oil-water separation and mechanical properties of coating, so as to solve the key problems such as corrosion resistance of metal surface, oil-water permeability and separation performance, bonding force between coating and metal substrate