Influence of artificial accelerated aging on the protective performance of polyurea coatings

UV accelerated aging was performed on polyurea anti-corrosion coatings. The aging behavior of the coatings was analyzed by gloss meter, scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR) in combination with electrochemical impedance spectroscopy (EIS). Experiment results indicate that the coating accelerated aging is divided into early, middle and late stages. The color of the coating surface changes severely in the middle stage. SEM images of the coating surface and cross section show that the development of aging cracks to the substrate is terminated by tiny bubbles, and the anticorrosion performance of the coatings declines very slightly.