Coatings of marine equipment inevitably suffer from physical or chemical damage in service, together with biofouling from microbial attachment, leading to a shorter service life of them. Herein, a multifunctional corrosion-resistant coating with efficient photothermal self-healing and anti-biofouling performance was designed by using CuO/g-C₃N₄ (CuO/CN) S-scheme heterojunction filler in combination with polydimethylsiloxane (PDMS) as the coating matrix for achieving the effective protection of Q235 steel. The results of the electrochemical impedance spectroscopy (EIS) experiments indicate that the CuO/CN/PDMS composite coatings possessed excellent corrosion resistance, in which the impedance radius of optimal CuO/CN-1/PDMS composite coating could still remain 3.49 × 10⁹ Ω cm² after 60 d of immersion in seawater under sunlight irradiation. Meanwhile, the as-prepared CuO/CN/PDMS composite coating not only can be rapidly heated up under the Xenon lamp illumination to achieve complete self-repair of scratches within 45 min, but also exhibited excellent antimicrobial effects in the antifouling experiments. This study opens a new avenue for the development of g-C₃N₄-based multifunctional coatings and provides guidance for the development of the next generation of intelligent protective coatings.

中文翻译：

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集成 CuO/g-C3N4 S 型异质结自修复涂层：一种实现高级防腐蚀和抗生物污染性能的协同方法


船用设备的涂层在使用中不可避免地会受到物理或化学损坏，以及微生物附着造成的生物污垢，从而导致其使用寿命缩短。本文以 CuO/g-C₃N₄ （CuO/CN） S 型异质结填料为涂层基体，以聚二甲基硅氧烷 （PDMS） 为涂层基体，设计了一种具有高效光热自修复和抗生物污染性能的多功能耐腐蚀涂层，以实现对 Q235 钢的有效保护。电化学阻抗谱（EIS）实验结果表明，CuO/CN/PDMS复合涂层具有优异的耐腐蚀性，其中最佳CuO/CN-1/PDMS复合涂层在阳光照射下浸泡海水60 d后，其阻抗半径仍能保持3.49 × 10⁹ Ω cm²。同时，所制备的CuO/CN/PDMS复合涂层不仅能在氙灯照射下快速升温，在45 min内实现划痕的完全自我修复，而且在防污实验中表现出优异的抗菌效果。本研究为 g-C₃N₄ 基多功能涂料的发展开辟了新的途径，为下一代智能防护涂料的发展提供了指导。