Multifunctional ZnAl-MoO4 LDH assembled Ti3C2Tx MXene composite for active/passive corrosion protection behavior of epoxy coatings

Two-dimensional Ti 3 C 2 T x MXene is a promising anticorrosive filler for epoxy coating, but only passive protection makes Ti 3 C 2 T x -based composite coating unable to meet long-term anticorrosive requirements. For this reason, the ZnAl-NO 3 LDH layers and active corrosion inhibitor MoO 4 2- are introduced into Ti 3 C 2 T x MXene surface, where LDH layers cannot only be used as the acid response nanocontainer for MoO 4 2- , but also an additional active corrosion inhibitor, and a reservoir to trap Cl - . The obtained ZnAl-MoO 4 LDH@Ti 3 C 2 T x MXene composite corrosion inhibitor is an acid-response and active/passive protective dual-functional composite corrosion inhibitor. The ZnAl-MoO 4 LDH@Ti 3 C 2 T x MXene contained composite coating can exhibit the excellent anticorrosion performance and certain self-healing property, owing to the synergistic effect including the physical shielding effect of two-dimensional Ti 3 C 2 T x MXene, Cl - adsorption/capture effect of hydrotalcite, and inhibition membrane formation of Zn 2+ and MoO 4 2- in the composite corrosion inhibitor. This work is of great significance to the synthesis of multifunctional composite corrosion inhibitors and the application of Ti 3 C 2 T x MXene-based composite coatings in the field of corrosion protection.