A dual-functional coating was developed by incorporating carbon dots (CDs) based additives with corrosion sensing and inhibition properties into a polyurethane (PU) matrix. The complex formed between CDs and 1,10-Phenanthrolin-5-amine (APhen) displays not only a bright red color but also fluorescence quenching in the presence of Fe (II) and Fe (III) ions produced during steel corrosion. Electrochemical measurement and molecular simulation results demonstrate that compared with the CDs, APhen, and their mixture, CDs-APhen complex with multiple surface functional groups, chemical bonding, parallel adsorption, and higher binding energy with iron surface can offer a good inhibition effect against steel corrosion in 1 M HCl solution. Subsequently, CDs-APhen was anchored onto sericite (SC) structure and then incorporated into PU coating. A PU coating containing 2 wt% CDs-APhen@SC demonstrated good barrier property and self-healing performance, which was ascribed to the corrosion inhibition property of CDs-APhen and the layered structure of SC. In addition, the released CDs-APhen complex provided rapid color/fluorescence responses to Fe ions, offering sensitive self-reporting performance during the initial stage of steel corrosion.

中文翻译：

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基于 APhen 接枝碳点的具有腐蚀抑制和彩色荧光损伤报告特性的聚氨酯涂料

通过将具有腐蚀传感和抑制特性的碳点 (CD) 添加剂融入聚氨酯 (PU) 基质中，开发了一种双功能涂层。 CDs 和 1,10-菲咯啉-5-胺 (APhen) 之间形成的络合物不仅显示出亮红色，而且在钢腐蚀过程中产生的 Fe (II) 和 Fe (III) 离子存在下荧光猝灭。电化学测量和分子模拟结果表明，与CDs、APhen及其混合物相比，CDs-APhen复合物具有多个表面官能团、化学键合、平行吸附以及与铁表面较高的结合能，对钢具有良好的缓蚀效果。 1 M HCl 溶液中的腐蚀。随后，CDs-APhen 锚定到绢云母 (SC) 结构上，然后掺入 PU 涂层中。含有2 wt% CDs-APhen@SC的PU涂层表现出良好的阻隔性能和自修复性能，这归因于CDs-APhen的缓蚀性能和SC的层状结构。此外，释放的 CDs-APhen 复合物对 Fe 离子提供快速的颜色/荧光响应，在钢腐蚀的初始阶段提供灵敏的自我报告性能。