Research Progress of Anti - Corrosion for Polyurea Coatings in Marine Environment

Polyurea is widely used in marine anti-corrosion engineering because it has the physical advantages of high tensile strength, strong adhesion, excellent waterproof and anti-corrosion performance as well as mature construction technology. In this paper, the origin, characteristics and development direction of polyurea coating technology were first introduced, and then the applications of polyurea coating in the fields of concrete protection and metal protection in marine atmospheric environment and seawater environment in recent years were summarized, respectively. Aiming at the problems of coating performance degradation and failure caused by complex environmental factors such as temperature, corrosive medium erosion and collision during service, the research progress of new polyurea coatings was discussed, including the research on improving the performance of coatings such as corrosion resistance, wetting and hardness with organic and inorganic nanoparticles as fillers, and the research on new polyurea microcapsule coatings that could respond intelligently and repair microcracks independently, and the research on the processing and preparation technology of new self-healing materials such as electrospinning. Finally, the shortcomings and challenges of the current research on polyurea coating were pointed out, and the future research trend of polyurea coating in marine environment was prospected.