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[目的]铜件表面电刷镀银-石墨复合镀层可有效提高器件的耐磨性、耐蚀性和导电性。而纳米石墨颗粒在镀液中的分散性对复合镀层的组织结构和性能有着重要影响。[方法]依次对纳米石墨颗粒进行酸、碱和表面活性剂预处理，研究预处理工艺对石墨在镀液中沉降行为，以及镀液长时间放置后所得Ag镀层组织结构、显微硬度和导电性的影响。[结果]十二烷基硫酸钠(SDS)体系石墨分散液的分散性和抗沉降性能最好。使用经SDS预处理的纳米石墨作为第二相制备的Ag–石墨复合镀层的显微硬度较高，导电性较好。[结论]对纳米石墨进行适当的预处理可明显提升其在镀层中的分布均匀性，以及提高Ag–石墨复合镀层的致密性、显微硬度和导电性。
Abstract：[Objective] The wear resistance, corrosion resistance, and conductivity of copper parts can be effectively improved by electro-brush plating with silver–graphite composite coating. The dispersion stability of nano-graphite particles in plating bath significantly influences the microstructure and properties of Ag–graphite composite coatings. [Method] The nano-graphite particles were pretreated with acid, alkali, and surfactant subsequently to study the effects of pretreatment on the sedimentation behavior of graphite in bath. The microstructure, microhardness, and conductivity of Ag–graphite composite coatings obtained from aged baths were studied. [Result] The sodium dodecyl sulfate(SDS)-based graphite suspension demonstrated the best dispersion stability and anti-sedimentation performance. The Ag–graphite composite coating incorporating SDS-pretreated nano-graphite as the second phase exhibited high microhardness and superior conductivity. [Conclusion] Appropriate pretreatment of nano-graphite particles significantly improves their uniform distribution in composite coatings, thereby enhancing the compactness, microhardness, and conductivity of Ag–graphite composite coating.
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基本信息:
DOI：10.19289/j.1004-227x.2025.09.007
中图分类号:TQ153
引用信息:
[1]王晔辰,方晨,刘晓谦,等.纳米石墨预处理对电刷镀银-石墨复合镀层组织和性能的影响[J].电镀与涂饰,2025,44(09):52-57.DOI:10.19289/j.1004-227x.2025.09.007.
基金信息:
国网浙江省电力有限公司科技项目（5211JH24000C）