金属-石墨烯复合涂层研究进展

对石墨烯与各种材料的复合涂层进行了详细的介绍,主要包括金属-石墨烯复合涂层的制备方式、制备工艺、石墨烯的分散性以及石墨烯的添加对涂层性能的影响.电沉积、化学镀和电刷镀等制备方式都可以获得均匀致密的复合涂层,石墨烯的加入细化了涂层的晶粒,使涂层的微观形貌发生了一定的改变.石墨烯作为第二相粒子添加时,机械超声分散效果较差,一般通过添加表面活性剂再配合机械超声分散的方式来分散石墨烯,表面活性剂中的阴离子活性剂与阳离子活性剂配合使用分散效果较好.另外,还有一种保持石墨烯在溶液中浓度动态平衡的方法也有较好的效果.石墨烯作为第二相粒子加入金属涂层中,增强了金属涂层的导热、导电、耐磨、硬度和耐腐蚀等方面性能.最后,分析展望了金属与石墨烯复合涂层的发展趋势.

Research Progress of Metal-Graphene Composite Coatings

Graphene is a two-dimensional material composed of hexagonal carbon atoms. Due to its unique physical, chemical and mechanical properties, graphene has been considered as an ideal reinforcement phase of metal materials. Researchers have prepared composite coatings of various metals and graphene. In this paper, the composite coatings of graphene and various materials are reviewed in detail, including the preparation method and processes of the composite coating, the dispersion of graphene and the effect of graphene on the properties of the coating. Preparation methods such as electrodeposition, electroless plating and electric brush plating can obtain uniform and dense composite coatings. The addition of graphene refines the grains of the coating and changes the microscopic morphology of the coating. When graphene is added as the second phase particles, the mechanical ultrasonic dispersion effect is poor. Generally, the graphene is dispersed by adding a surfactant and then combined with mechanical ultrasonic dispersion. Among the surfactants, the dispersion effect of the combination of anionic and cationic surfactants is better. In addition, another method to maintain the dynamic equilibrium of graphene concentration in solution has also achieved good results. The addition of graphene as the second phase particles enhances the thermal conductivity, electrical conductivity, wear resistance, hardness and corrosion resistance of the metal coating. Finally, the development trend of metal and graphene composite coatings are analyzed.