CeO2 grafted polydopamine-wrapped graphene to enhance corrosion resistance of coated steel

CeO2 grafted polydopamine-wrapped graphene (G@PDA-CeO2) was prepared by the layer-by-layer assembly to enhance the anticorrosive property of the epoxy resin. Electrochemical measurement results show that embedding 0.5 wt% of G@PDA-CeO2 in the epoxy resin can effectively protect metal substrates for up to 56 days. After being immersed in a 3.5% NaCl solution for 56 days, its impedance modulus at 0.01 Hz is still as high as 1.360 x 10(8) Omega cm(2), which is 2 orders of magnitude higher than pure epoxy resin coating. In addition, the scratch immersion test results show that the composite coating embedded with 0.5 wt% G@PDA-CeO2 has excellent corrosion inhibition. Such excellent anticorrosive property is attributed to the synergistic effect of graphene's outstanding barrier effect, polydopamine's improved dispersibility, and CeO2's efficient corrosion inhibitory effect and weak hydrophilicity. This research provides a promising strategy for the preparation of long-term corrosion-resistant graphene-based polymer anticorrosive coatings.