中文摘要：

对碳纳米管进行不同时间的球磨，以聚丙烯酸为分散荆、铅锡镀液为分散介质，制备了用于复合镀的碳纳米管铅锡悬浮液。采用分光光度法测定了悬浮液的沉降比，采用摩擦试验法测定了镀层的摩擦因数。研究了分散剂含量、球磨时间对碳纳米管铅锡悬浮液稳定性的影响，并对其分散机理进行了初步探讨。结果表明，聚丙烯酸在铅锡镀液中能有效地分散碳纳米管。当聚丙烯酸的体积分数为0.3％、球磨机转速为300r／min、球磨时间为6h时，悬浮液的沉降比最小，复合镀层的摩擦因数也最小。聚丙烯酸对碳纳米管的稳定分散作用主要是通过电空间稳定机制来实现的。

英文摘要：

In order to get homogeneously dispersed carbon nanotubes suspension for composite plating, carbon nanotubes are ball milled for different times and polycyclic acid （PA） is used as a dispersant. Sedimentation ratio is calculated by measuring the absorbance of suspensions and friction coefficient of the composite coatings is measured by friction test. The effects of dispersant content and ball milling times on the dispersive stability of suspension are stu- died. In addition, the dispersion mechanism is preliminarily discussed. The results show that PA can effectively disperse carbon nanotubes in Pb-Sn electroplating solution. The volume fraction of PA is 0.3%, milling time is 6h and the milling speed is 300r/min, sedimentation ratio is the smallest. The composite coatings have the smallest friction coefficient too. Besides, the dispersion of carbon nanotubes in Pb-Sn electroplating solution with PA mainly results from electrostatics stabilization.