Preparation of α-Fe2O3@TA@GO composite material and its anticorrosion performance in epoxy modified acrylic resin coatings

Adding organic-inorganic composite materials is a common way to improve the anti-corrosion performance of organic coatings. In this study, tannic acid as a bridge was first modified with the mica iron oxide, and then reacted with the carboxyl group on the surface of graphene oxide. Mica iron oxide @ tannic acid @ graphene oxide (α-Fe2O3@[email protected]) composite materials were prepared and characterized by infrared spectroscopy, x-ray diffractometer, x-ray photoelectron spectrometer, and scanning electron microscope. The modified products showed good dispersion stability in water, and the sedimentation time was increased from 3 h to 24 h. Composite materials were doped in waterborne epoxy modified acrylic to manufactured coatings. The electrochemical workstation was used to evaluate the corrosion performance of coatings. It was found that the corrosion resistance of the paint film could be greatly improved by adding composite materials characterized by Potentiodynamic polarization curves and EIS analysis. The optimal corrosion resistance can be obtained by adding 5wt% α-Fe2O3@[email protected] fillers. The corrosion current density (icorr) was 1.459 μA/cm2 and the charged transfer resistance (Rct) was up to 14350 Ω cm2, which was shown good potential as anti-corrosive fillers in coatings.