Functionalized carbon dots (CDs) obtained from citric acid derivative were selected as intercalator to modify graphene and then dispersed into epoxy matrix to prepare CDs modified graphene/epoxy (CDs-G/EP) coatings. Meanwhile, their microstructure, self-healing and corrosion resistance behaviors were analyzed deeply. Structural characterizations indicated the formation of “π-π” interaction between functionalized carbon dots and graphene. By observation, the dispersion and interface compatibility of graphene were greatly enhanced by CDs. The change rules of electrochemistry results implied that the addition of 0.5 wt.% CDs-G in EP coating (CDs-G_0.5%/EP) demonstrated a superior protective property on steel, which was attributed to the physical barrier of highly dispersed graphene and the self-healing ability of CDs. After 50 days immersion, the oxygen permeability coefficient and water absorption of CDs-G_0.5%/EP coating were only 4.27 × 10^-13 cm³ cm cm^-2 s^-1 Pa^-1 and 4.4%, respectively.

选择从柠檬酸衍生物获得的官能化碳点（CDs）作为插层剂以修饰石墨烯，然后分散到环氧基质中以制备CDs修饰的石墨烯/环氧树脂（CDs-G / EP）涂层。同时，对它们的微观结构，自我修复和耐腐蚀性能进行了深入分析。结构表征表明官能化碳点和石墨烯之间形成“π-π”相互作用。通过观察，CD极大地增强了石墨烯的分散性和界面相容性。电化学结果的变化规律暗示在EP涂层中添加0.5 wt。％CDs-G（CDs-G _0.5％/ EP）对钢表现出优异的保护性能，这归因于高度分散的石墨烯的物理屏障和CD的自愈能力。浸泡50天后，CDs-G _0.5％ / EP涂层的透氧系数和吸水率分别仅为4.27×10 ^-13  cm ³ cm cm ^-2 s ^-1  Pa ^-1和4.4％。