Graphic C3N4-assisted dispersion of graphene to improve the corrosion resistance of waterborne epoxy coating

The application of graphene (Gr) in waterborne coatings is restricted owing to its strong hydrophobic properties. Herein, graphitic (g)-C 3 N 4 , also with good barrier properties, has been used for the first time to disperse Gr in epoxy solution via simple ultrasonic vibration. The morphologies and structures of g-C 3 N 4 and Gr/g-C 3 N 4 were characterized through FT-IR, XRD, XPS, UV–vis absorption spectra, TEM and Raman spectra. Corrosion resistance performances of the g-C 3 N 4 /epoxy and Gr/g-C 3 N 4 /epoxy nanocomposites coatings were evaluated by electrochemical impedance spectroscopy (EIS) and salt spray tests. Gr/g-C 3 N 4 /epoxy nanocomposites coating exhibits improved anti-corrosion performance in contrast to g-C 3 N 4 /epoxy coating due to enhanced barrier performances.