Towards superior anti-corrosion behavior of composite coating via aligned MXene nanosheets enabled by PDDA-ionic liquids dual-functionalization

Despite Ti 3 C 2 T x- based filler has gained enormous application in improving the anti-corrosion of epoxy coatings, it is still insufficient to achieve the quality standard to face long-term service conditions. In this work, a composite coating integrated with Ti 3 C 2 T x and epoxy resin was prepared, which was fabricated by functionalizing Ti 3 C 2 T x through a strong cationic poly (diallyl dimethyl ammonium) chloride (PDDA) electrostatic adsorption and ionic liquids (ILs) to improve the chemical stability, and then the functionalized Ti 3 C 2 T x was controlled to parallelly distributed in epoxy under the external electric field. Results showed that Ti 3 C 2 T x nanosheets fillers in the prepared epoxy coating exhibit a flat arrangement for resisting infiltration. After immersion in 3.5 wt% NaCl solution for 28 days, the low-frequency impedance modulus of the prepared PDDA-ILs@Ti 3 C 2 T x /EP coating was about 1–2 orders of magnitude compared to that of epoxy coating and was maintained above 10 8  Ω. cm 2 . Integrating the triple effect of the interfacial interaction, directional-aligned barrier effect and intelligent effect formed by ILs, it can provide new idea for developing MXene-based smart coating for the corrosion protection of oil and gas field pipelines steel.