Highly dispersed nanofibers with continuous strengthening interface can enhance the anticorrosion and wear resistance of traditional waterborne epoxy resin. Here, the polyurea nanofibers with ~50 nm in diameter were synthesized by addition polymerization of methylene diphenyl diisocyanate and organic amine. Good wettability signifies a continuous tightly reinforced interface in the coating. Good dispersed polyurea nanofibers at 0.25 wt% can effectively fix micro-defects for achieving the best barrier performance, which lengthens even restrains the corrosion diffusion path of electrolyte. The impedance of as-prepared composite coating is increased by almost four times, providing long-lasting protection even in harsh environments. Meanwhile, the polyurea nanofibers with 0.25 wt% can greatly improve the wear resistance of coating up to 73.2 %, indicating that the inevitable wear in service has been dealt well. The anti-wear capacity of composite coating is derived from the entangled polyurea nanofibers transmitting the force of the contact surface and dimensional resistance to prevent coating displacement. Herein, this work presents a promising application of polyurea nanofibers to enhance the anti-corrosion and wear resistance of epoxy resin.

具有连续强化界面的高度分散的纳米纤维可以增强传统水性环氧树脂的防腐耐磨性。在这里，通过亚甲基二苯基二异氰酸酯和有机胺的加聚反应合成了直径约 50 nm 的聚脲纳米纤维。良好的润湿性表示涂层中连续紧密增强的界面。0.25 wt%的良好分散的聚脲纳米纤维可以有效地修复微缺陷以获得最佳的阻隔性能，从而延长甚至抑制电解液的腐蚀扩散路径。所制备的复合涂层的阻抗增加了近四倍，即使在恶劣的环境中也能提供持久的保护。同时，0.25 wt%的聚脲纳米纤维可以大大提高涂层的耐磨性，最高可达73.2 %，表明在使用中不可避免的磨损得到了很好的处理。复合涂层的抗磨损能力来源于缠绕的聚脲纳米纤维传递接触面的力和尺寸阻力以防止涂层位移。在此，这项工作展示了聚脲纳米纤维在增强环氧树脂的抗腐蚀和耐磨性方面的应用前景。