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[目的]研究电泳沉积(EPD)电压和时间对石墨烯涂层结构和摩擦学性能的影响，为制备高性能石墨烯润滑涂层提供理论数据。[方法]采用金属离子修饰法制备出稳定的石墨烯悬浮液，基于COMSOL Multiphysics软件有限元仿真构建三维电泳沉积模型，研究了不同电极排布条件下的电场分布对石墨烯沉积均匀性的影响。通过显微形貌观察和摩擦磨损试验对比了不同沉积电压和不同沉积时间所得石墨烯涂层的结构和摩擦学性能。[结果]阴极和阳极尺寸之比为2∶3时可制得较为均匀的石墨烯涂层。电压较低(如5～20 V)时，所得石墨烯涂层结构致密，摩擦学性能较好；电压较高(如50～100 V)时，石墨烯颗粒的迁移速率较高，但容易发生团聚而削弱涂层的自润滑性能。沉积时间对石墨烯涂层摩擦因数的影响较小。[结论]电泳沉积电压是影响石墨烯涂层摩擦学性能的主要因素，在5～20 V的低电压下电泳沉积所得石墨烯涂层具有良好的减摩性能。
Abstract：[Objective] The effects of electrophoretic deposition(EPD) voltage and time on the structure and tribological properties of graphene coatings need to be studied to provide theoretical data for preparation of high-performance graphene lubricating coatings. [Method] A stable graphene suspension was prepared via metal ion modification. A threedimensional EPD model was constructed based on finite element analysis using COMSOL Multiphysics software to simulate electric field distribution under various electrode arrangements and its influence on deposition uniformity of graphene. The microstructure and tribological properties of graphene coatings obtained by electrophoretic deposition at different voltages and durations were compared through microscopic morphology observation and friction-wear tests.[Result] The graphene coating obtained at cathode-to-anode size ratio of 2:3 was relatively uniform. The graphene coatings obtained at low voltages of 5-20 V were compact with superior friction property. At high voltages(i.e. 50-100 V),graphene particles migrated faster but tended to agglomerate, compromising the self-lubrication performance of coating.Deposition time had a minor effect on the friction coefficient of graphene coating. [Conclusion] The electrophoretic deposition voltage is the primary factor affecting the tribological properties of graphene coating. Coatings deposited at low voltages(i.e. 5-20 V) demonstrate excellent lubricating property.
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基本信息:
DOI：10.19289/j.1004-227x.2025.06.005
中图分类号:TQ153
引用信息:
[1]金涛,郎浩杰,彭倚天.不锈钢表面电泳沉积石墨烯涂层及其摩擦学性能[J].电镀与涂饰,2025,44(06):30-36.DOI:10.19289/j.1004-227x.2025.06.005.
基金信息:
国家自然科学基金（52375172）; 上海市自然科学基金（24ZR1401200）