Effect of chemical bonding between fluorographene and fluororesin on the anti-corrosion properties of their composite coating

Abstract

Fluorographene has unique advantages in the corrosion protection of heat exchangers. Excessive fluorographene loading can ensure the thermal conductivity performance of coatings, however, it also damages the coating integrity and reduces the corrosion resistance. Therefore, the project focuses on the effects of interfacial compatibility between fluorographene and polymer on the corrosion resistance of composite coatings. Fluorographene and fluororesin have been modified to prepare composite coatings (K-PFA). This modification improves the dispersion of fluorographene in the coating matrix and enhances the interface compatibility between the two materials. The crystallinity of the composite coating has increased from 33.66 % to 40.25 %. The corrosion protection performances of K-PFA are improved due to the reduction in water vapor and oxygen permeability by 83.8 % and 73.1 %, respectively, and the coating resistance of K-PFA is 3–4 times higher than that of blank coating. By utilizing surface modification techniques, the interface compatibility between fluorographene and the coating has been optimized, resulting in enhanced anti-corrosion properties for coatings.