Abstract
Two-dimensional Ti 3 C 2 T x has demonstrated great potential for enhancing the protection performance of epoxy coating , but randomly-arranged Ti 3 C 2 T x fails to meet higher expectations on the anti-corrosion/wear under extreme conditions. Here, the positively-charged Ti 3 C 2 T x (f + -Ti 3 C 2 T x ) flakes obtained by functionalization and protonation were directionally distributed in the epoxy coating using an electrophoretic deposition method. The migration/rotation of f + -Ti 3 C 2 T x flakes under electric field force and their mutual repulsion are responsible for the parallel alignment with the horizontal direction of coating. In particular, the epoxy coating incorporated with 1 wt % f + -Ti 3 C 2 T x exhibits a near-perfect internal arrangement structure. When exposed to saline solution for the long period, its water absorption is decreased by 85.33% and the lowest-frequency impedance is increased by four orders of magnitude compared with randomly-arranged Ti 3 C 2 T x hybrid epoxy coating, because parallelly-arranged f + -Ti 3 C 2 T x with orientation factor can maximize the internal tortuosity and optimize the barrier properties of epoxy coating against aggressive ions. Furthermore, a significant friction reduction and an order of magnitude reduction in wear rate are obtained, mainly based on the increase of the deflection and branching of cracks in the friction process thus decreasing the probability of coating exfoliation . Therefore, the directional alignment of Ti 3 C 2 T x in the epoxy coating can immediately upraise the protection properties’ ceiling, specifically suitable for long-term anti-corrosion/wear applications. • The positively charged f + -Ti 3 C 2 T x is successfully arranged in parallel by electric field action. • The physical barrier network with the largest tortuosity formed by the parallelly-arranged f + -Ti 3 C 2 T x array significantly inhibits the penetration rate of corrosive ions. • The horizontal regular arrangement of f + -Ti 3 C 2 T x increases deflection and branching of cracks during defect growth, and thus reducing coating exfoliation. • This work raises the anti-corrosion/wear ceiling of Ti 3 C 2 T x -based epoxy coatings, and the facile preparation process is conducive to large-scale practical applications.
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