The poor dispersity of graphene in epoxy (EP) coating is harmful to exerting its barrier effect, and the protective efficiency of onefold coating has some difficulty to meet the ever-increasing demands of corrosion protection on Al alloy. Herein, a multilayer protection system (FG-SH-EP) coating was composed of a top superhydrophobic (SH) coating and a bottom amino-functionalized graphene/epoxy (FG-EP) coating. The as-designed multilayer protection system shows good water-repellent (the water contact angle is over 150). The lowest-frequency impedance of FG-SH-EP is increased by an order of magnitude, because SH surface strengthens the water resistance for early safeguard and FG builds tortuous diffusion path for corrosion media towards physical barrier effect. Additionally, the anti-wear ability of FG-SH-EP is improved by about four times compared to single EP coating. The excellent anti-corrosion/wear behaviors of FG-SH-EP are attributed to the synergistic protection effect of SH-EP and FG-EP. This work is helpful to promote the application of multilayer strategy in alloy protection field.

石墨烯在环氧（EP）涂层中的分散性差，不利于发挥其阻隔作用，单一涂层的防护效率难以满足对铝合金日益增长的腐蚀防护要求。在此，多层保护系统（FG-SH-EP）涂层由顶部超疏水（SH）涂层和底部氨基功能化石墨烯/环氧树脂（FG-EP）涂层组成。所设计的多层保护系统显示出良好的防水性（水接触角超过 150 度）。FG-SH-EP 的最低频率阻抗增加了一个数量级，因为 SH 表面增强了早期保护的防水性，而 FG 为腐蚀介质建立了曲折的扩散路径，以实现物理屏障效应。此外，FG-SH-EP的抗磨能力比单层EP涂层提高约四倍。FG-SH-EP优异的防腐/磨损性能归功于SH-EP和FG-EP的协同保护作用。这项工作有助于推动多层策略在合金保护领域的应用。