Research purposes: In order to improve the protection period of anticorrosive coating for railway steel bridge and reduce the life cycle cost of steel bridge coating, a new type of graphene zinc-based fluorocarbon ultra durable anti-corrosion coating system was designed by using graphene to modify the seventh set anti-corrosion coating system of railway industry standard.
Research conclusions: (1)Through the analysis of the modification mechanism of graphene zinc-based fluorocarbon ultra durable anti-corrosion coating system, the salt spray resistance of the graphene zinc primer coating and the aging resistance of graphene fluorocarbon finish coating can be improved significantly by adding graphene properly. (2) The experiment results show that the salt spray resistance test of 80 μm graphene zinc primer coating reaches 4 500 h and the aging resistance test of 70 μm graphene fluorocarbon finish coating reaches 6 800 h, where the other performance indexes meet or are better than those of primer and finish coating in railway standard. (3) By comparing the anti-corrosion coating system cases of the existing bridge engineering, the designed protection period of the graphene zinc-based fluorocarbon ultra durable anti-corrosion coating system can reach 30～50 years, which can achieve long-term protection for steel bridges structure. (4) The research results can be applied to the long-term anticorrosive coating design of steel structures of railway bridges and other fields under different atmospheric corrosion environments.