In order to construct waterborne epoxy composite coating with enhanced anti-corrosive performance, the development of efficient additives with good compatibility with adhesive resin and good interaction with steel matrix is of significance. Herein, we adapted two heteroatom (N and S) doped carbon quantum dots, namely ACDs and LCDs, as eco-friendly anti-corrosion components to mix with water-based epoxy resin (WP) to prepare the CDs/WP composite coating. Compared with the ACDs/WP composite, the LCDs/WP composite exhibited a better performance because it contained more functional groups such as carboxyl and hydroxyl on the surface of LCDs, which not only made the system denser but also facilitated the multi-anchor coordination and adsorption on carbon steel. Following immersing in a 3.5 wt% NaCl solution for 28 d, the impedance modulus of LCDs/WP surpassed 10 Ω cm, exhibiting approximately three orders of magnitude higher values compared to pure WP coatings. The inhibition efficiency was improved by 96.9%. The facile synthesis of LCDs coupled with excellent anti-corrosive properties of LCDs/WP composites, provides a new way for developing anti-corrosion coating materials.

中文翻译：

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含有 N,S 掺杂碳点的水性环氧复合涂层可增强耐腐蚀性

为了构建具有增强防腐性能的水性环氧复合涂层，开发与粘合树脂具有良好相容性、与钢基体具有良好相互作用的高效添加剂具有重要意义。在此，我们采用两种杂原子（​​N和S）掺杂的碳量子点，即ACD和LCD作为环保防腐成分，与水性环氧树脂（WP）混合制备CDs/WP复合涂层。与ACDs/WP复合材料相比，LCDs/WP复合材料表现出更好的性能，因为LCDs表面含有更多的羧基和羟基等官能团，这不仅使体系更加致密，而且有利于多锚点的配位和结合。碳钢上的吸附。在 3.5 wt% NaCl 溶液中浸泡 28 天后，LCD/WP 的阻抗模量超过 10 Ω cm，与纯 WP 涂层相比，阻抗模量高出约三个数量级。抑制效率提高96.9%。 LCD的简便合成加上LCD/WP复合材料优异的防腐性能，为开发防腐涂层材料提供了新的途径。