Tannin-based modified graphene oxide anti-corrosion composite coating with favourable corrosion inhibition, self-healing and photothermal conversion properties

Inspired by the polyphenol hydroxyl structure of tannic, this work reports a graphene-based anti-corrosive composite coating that integrates inhibition, self-healing and photothermal conversion properties. Electrochemical tests in solution and scratch phases illustrate that the inhibition effect of modified particles provide passive healing. For intact coating, after 50 days of immersion, the G2T2F8/AR coating maintains the highest impedance modulus throughout the entire process (1.04×1010 Ω cm2). More importantly, the scratch coating can achieve active healing of photothermal conversion through NIR stimulation. The combination of exogenous and intrinsic healing mechanisms enables the coating to own excellent self-healing and anti-corrosion effects.