石墨烯水分散液:增强水性环氧涂料的耐蚀性

高性能石墨烯增强环氧(G/EP)复合涂层制备的主要挑战是G纳米片在水性EP基体中的均匀分散,通过石墨烯量子点(GQDs)非共价键功能化成功地制备出了具有良好分散能力的G纳米片。该石墨烯(G)纳米片可用作水性EP涂层的屏蔽增强剂,并能显著改善水性EP涂层的防腐性能。在3.5%NaCl水溶液中浸泡96 h后,纯EP涂层的阻抗从10~6Ω·cm^2急剧下降10~5Ω·cm^2,而G/EP涂层的阻抗模量仅从10~7Ω·cm^2下降到10~6Ω·cm^2,其阻抗约提高到了近两个数量级。另外,极化曲线测试表明,G/EP涂层的防腐效率从纯EP涂层的92.3%提升至99.1%。

Graphene water dispersion: enhancing the corrosion resistance of waterborne epoxy coatings

The main challenge for the preparation of high performance G/EP composite coatings is the uniform dispersion of G nanosheets in waterborne EP matrix.In this study,the non-covalent functionalization of graphene(G)was achieved with the assist of graphene quantum dots(GQDs).The G nanosheet can be used as a barrier enhancer for waterborne epoxy(EP)coatings and significantly improve the corrosion resistance.After immersion in a 3.5%NaCl aqueous solution for 96 h,the impedance of the pure EP coating decreased sharply from10 6 to10 5Ω·cm^2,while the G/EP coating decreases slightly from10 7 to10 6Ω·cm^2.In addition,the polarization curve tests showed that the protection efficiency of the G/EP coating increased from 92.3%of the pure EP coating to 99.1%,indicating its superior corrosion resistance.