铝–碳纳米管复合镀层的电沉积

Electrodeposition of aluminum–carbon nano-tube composite coating

采用有机溶剂体系在紫铜基体上电沉积制备Al–碳纳米管(CNTs)复合镀层。镀液组成为:Li Al H4 10 g/L,四氢呋喃600 m L/L,Al Cl3 100 g/L,甲苯400 m L/L,柠檬酸钠20 g/L,分散剂0.4 g/L,CNTs 1 g/L。研究了电流密度、温度、搅拌速率和电镀时间对电沉积Al–CNTs复合镀层的影响,得到较好的工艺条件为:电流密度6 A/dm2,温度25°C,搅拌速率300 r/min,时间40 min。在该工艺条件下制备的Al–CNTs复合镀层呈较光亮的灰白色,厚度约为30μm,镀层的微观表面凹凸不平,但晶粒比纯Al镀层更为细致。

Al-carbon nano-tube （CNT） composite coating was prepared on pure copper substrate from an organic solvent system composed of 10 g/L LiAlH4, 600 mL/L tetrahydrofuran, 10 g/L AlCl3, 400 mL/L methylbenzene, 20 g/L sodium citrate, 0.4 g/L dispersant, and 1 g/L CNTs. The effects of current density, temperature, stirring rate, and electrodeposition time on electrodeposition of Al-CNTs composite coating were studied. The optimal process conditions were obtained as follows： current density 6 A/dm2, temperature 25℃, stirring rate 300 r/min, and electrodeposition time 40 min. The Al-CNTs composite coating obtained under the given conditions is brightly gray-white with a thickness of ca.30 μm, featuring uneven microscopic surface and finer and more compact grains as compared with pure Al coating.