▎ 摘　　要

Tannic acid (TA) was self-assembled with graphene (Gr) via pi-pi interaction. Then green corrosion inhibitor cerium (III) cation (Ce 3+ ) was loaded on graphene sheets through a reversible complexation with tannic acid which is depending on pH value, enabling the release of Ce3+ in an acid environment. Characterization methods including fourier transform infrared spectroscopy (FT-IR), raman spectroscopy, transmission electron microscope (TEM), x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) mapping verified the successful preparation of Gr-TA and Gr-TA-Ce3+ hybrid materials. Electrochemical impedance spectroscopy (EIS) results of bare steel in the Gr-TA-Ce3+ extract showed the self-healing of Gr-TA-Ce3+ nanofillers which increased the impedance modulus at 0.01 Hz by one order of magnitude compared with bare steel. Waterborne epoxy coating doped with Gr-TA-Ce3+ material exhibited significant barrier performance originated from shielding property of graphene nanosheets against corrosive mediums and efficient self-healing capacity derived from the protective film formed by cerium cations. Electrochemical impedance spectroscopy results manifested that coating doped with Gr-TA-Ce3+ material maintained impedance modulus at 0.01 Hz of similar to 2.90 x 10(7) Omega.cm(2) after immersion in 3.5 wt% sodium chloride solution for 60 days, two orders of magnitude higher than neat epoxy coating.