为提高天然鳞片石墨镀铜效果,首先对天然鳞片石墨粉进行预处理,然后在其表面进行化学镀铜;研究了镀液温度、主盐浓度、还原剂加入量及装载量等因素对化学镀铜的影响,在此基础上获得了最佳工艺参数,最后对镀铜石墨粉进行钝化;对镀铜石墨粉进行了表征.结果表明:最佳化学镀铜工艺参数为镀液温度50.0℃,镀液中硫酸铜质量浓度20.0 g·L-1,甲醛加入量25.0mL·L-,装载量为5.0～6.0 g·L-1;在此条件下,镀液稳定性好,且镀速较快,能够在石墨表面较为完整地镀覆一层金属铜,得到的镀铜石墨粉色泽光亮;苯并三氮唑(BTA)酒精溶液的钝化效果良好,可以有效防止新生铜的氧化.
In order to improve the effect of copper-plating of natural flake graphite powders, the pretreatment process of natural flake graphite powders was carried out first. Then, electroless copper-plating on graphite was proceeded. The influences of solution temperature, main salt cocentration, reductant addition and loading capacity on deposition reaction were discussed and the processing parameters were also optimized. Finally, copper-coated graphite powders was passivated and characterized. The results show that the optimal parameters were as follows:plating solution temperature 50. 0 ℃, copper sulfate mass fraction in plating solution 20. 0 g · L-1 , formaldehyde addition 25. 0 mL · L-1 and loading capacity 5. 0-6. 0 g · L-1. Under the condition, a better stability and high deposition rate could be achieved. Graphite powders coated by copper totally with smooth-bright visualization could be obtained. The oxidation resistance of copper coating was greatly improved by using 1,2,3-benzotrialole alcohol solution as passivating agent.
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