Enhance "labyrinth" effect to delay coating failure

The advanced coating and adhesive team of Ningbo Institute of materials, Chinese Academy of Sciences has made new progress in the research and development of graphene cathodic anti-corrosion coating In view of the hidden danger that the damage of graphene / polymer composite anti-corrosion coating will accelerate the corrosion of metal matrix, they used biomass furan epoxy monomer to seal the surface of graphene through Da reaction, and realized the long-term anti-corrosion of graphene / epoxy coating Moreover, due to the existence of active chain segments, the coating can effectively improve the interface compatibility with epoxy matrix, improve the coating compactness, and greatly enhance the "labyrinth" effect of oxygen or water vapor through the coating, thus delaying the failure of the coating Electrochemical test shows that the coating material has excellent protective performance, and the resistance of composite coating increases by 3-4 orders of magnitude compared with blank coating It is reported that graphene is an ideal two-dimensional nano anti-corrosion filler In recent years, due to the continuous development of large-scale preparation technology of graphene materials, graphene coating has attracted extensive research interest in the field of corrosion protection A large number of studies have found that graphene polymer composite coating has more excellent protective performance than traditional polymer coating due to the synergistic effect of superhydrophobic and "labyrinth effect" Although some progress has been made in the study of graphene anticorrosion, there are still many areas in need of improvement or breakthrough Specifically, although graphene is an ideal anti-corrosion material, the development of graphene anti-corrosion technology is greatly limited by the "cathode corrosion promoting activity", so it is necessary to find an effective method to inhibit the activity.