GRAPHITE NANOPLATELETS-EPOXY COMPOSITES FOR ANTI-CORROSION COATINGS

In this study, graphite nanoplatelets/epoxy composite anticorrosive coating was prepared by using waterborne epoxy resin emulsion as the matrix and graphite nanoplatelets as filler. In order to improve the dispersibility of graphite nanoplatelets, the graphite nanoplatelets were firstly oxidized at high temperature, and the suitable oxidation conditions were selected by infrared spectroscopy. The results showed that the calcined graphite microsheets had better oxidation effect at 700°C for 0.5 h; The graphite nanoplatelets were promoted to be dispersed, and the graphite microsheets surfacetreated with the CS-311 coupling agent were respectively prepared by using three different dispersing agents. The best type of dispersant was discussed by metallographic microscopy and sal-fog corrosion testing. The results show that the anticorrosion coating with dispersant BYK-190 has the best dispersion effect and corrosion resistance. After determining the dispersant, a series of anticorrosion coatings were prepared using graphite nanoplatelets as a single variable. Through salt spray test, metallographic microscope test, electrochemical test, mechanical property test and other tests, the influence of the amount of graphite nanoplatelets on the performance of anticorrosive coatings was discussed, and the optimum amount of graphite nanoplatelets was determined. The results show that: 0.8% graphite nanoplatelets anticorrosion coating has good dispersion effect, and has the best corrosion resistance, and also has good mechanical properties such as hardness and impact strength.