Preparation of a fluorescent composite coating and its anticorrosive and indicative performance

Objective A novel fluorescent composite anti-corrosion coating was prepared, which could simultaneously indicate corrosion sites and corrosion degree according to change of fluorescence intensity. Methods Tri-HDI/GO/SR/AP coating was prepared by blending method. Its structure, physical properties, anti-corrosion ability and fluorescence intensity were analyzed. Results Tri-HDI/GO/SR/AP coating was not significantly damaged during the corrosion simulation experiment. The fluorescence intensity of the coating decreased with the increase of corrosion degree. Conclusions Based on structure characterization and electrochemical analysis, it is found that Tri-HDI/GO/SR/AP coating has positive anti-corrosion performance. Fluorescence molecules undergo a quenching reaction when corrosion occurs, the corrosion location and corrosion degree can be determined according to the changes of luminescence intensity.