Effect of nanotitanium-based hybrid materials and methyl methacrylate/nitrile rubber/graphene oxide on the microstructure and anticorrosion properties of waterborne epoxy resin coatings

Waterborne epoxy resins have been extensively applied to industries as green paints. However, waterborne epoxy resins are affected by several issues. To enhance their mechanical properties and corrosion resistance, we added nanotitanium-based hybrid materials (NTH), and methyl methacrylate (MMA)/nitrile rubber (NBR)/graphene oxide (GO) to waterborne epoxy resin. The researchers suggest that adding NTH and MMA/NBR/GO can well modify waterborne epoxy resin. Upon addition of 6 wt.% NTH and 1 wt.% MMA/NBR/GO (2-1 coating), scanning electron microscopy imaging shows that the coating is flat, with no evident crevices. Fourier-transform infrared spectroscopy results indicate that compared with the case in which either NTH or MMA/NBR/GO is added, the coating is denser when both fillers are added. The mechanical properties were also investigated, and the results demonstrate that the coating displayed a pencil hardness rating of "2H" and achieved a grade of "0" in terms of adhesion, respectively. Additionally, the coating's anticorrosion performance was evaluated through electrochemical tests. Tafel tests and electrochemical impedance spectroscopy tests reveal that the 2-1 coating possesses superior corrosion resistance with respect to the other coatings. Additionally, after a neutral salt spray test lasting 1440 h, the surface of the coating showed no signs of corrosion according to salt spray tests. Finally, the anticorrosion mechanism is discussed.