A self-healing coating possesses a broad application prospect in the metal corrosion protection area due to its pleasurable performance. By far, despite a great deal of research studies that have been reported in this field, it is still a challenge to construct an intrinsic self-healing surface that can repair a damaged structure and restore superhydrophobicity simultaneously. Herein, a self-healing superhydrophobic coating was fabricated by combining polydopamine (PDA)-functionalized Cu²⁺-doped graphene oxide (GO), octadecylamine (ODA), and polydimethylsiloxane (PDMS), which can recover the superhydrophobicity and microstructure of the coating after chemical/physical damage. The as-prepared self-healing coating displayed excellent liquid repellency with a water contact angle of 158.2 ± 2° and a sliding angle of 4 ± 1°, which endowed the Mg alloy with excellent anticorrosion performance. Once the coating is scratched, the local damaged structure will be automatically repaired through the chelation of catechol and Cu²⁺. Also, the superhydrophobicity of the coating can be rapidly restored under 1-sun irradiation even after being etched by O₂ plasma. Furthermore, the as-fabricated self-healing coating still exhibited excellent corrosion protection against a magnesium alloy after immersion in 3.5 wt % NaCl solution for 30 days, which was attributed to the efficient repair of defects in GO by PDA through π–π interactions and the inherent chemical inertia of PDMS. Moreover, the as-fabricated self-healing coating also exhibited favorable mechanical stability, chemical durability, and weather resistance. This study paves a fresh insight into the design of robust self-healing coatings with huge application potential.

中文翻译：

---

用于镁合金高效腐蚀保护的强大自修复氧化石墨烯基超疏水涂层

自修复涂层以其良好的性能在金属腐蚀防护领域具有广阔的应用前景。到目前为止，尽管该领域已经报道了大量的研究，但构建一种能够同时修复受损结构和恢复超疏水性的​​内在自修复表面仍然是一个挑战。在此，通过结合聚多巴胺（PDA）功能化的Cu ^{2+制备了一种自修复的超疏水涂层。}-掺杂氧化石墨烯（GO）、十八烷胺（ODA）和聚二甲基硅氧烷（PDMS），可以在化学/物理损伤后恢复涂层的超疏水性和微观结构。所制备的自修复涂层表现出优异的拒液性，水接触角为158.2±2°，滑动角为4±1°，赋予镁合金优异的防腐性能。一旦涂层被划伤，局部损坏的结构会通过儿茶酚和Cu ²⁺的螯合作用自动修复。此外，即使经过O _{2蚀刻，涂层的超疏水性在1-sun辐照下也能迅速恢复。}等离子体。此外，制成的自修复涂层在浸入 3.5 wt% NaCl 溶液 30 天后仍然表现出对镁合金的优异腐蚀保护，这归因于 PDA 通过 π-π 相互作用有效修复 GO 中的缺陷和PDMS 固有的化学惰性。此外，制备的自修复涂层还表现出良好的机械稳定性、化学耐久性和耐候性。这项研究为具有巨大应用潜力的坚固自修复涂层的设计提供了新的见解。