印制电路板在垂直连续电镀生产线上镀铜,通过改进电镀槽结构,引入喷流加强溶液交换等措施,能够使用更大的电流密度,大幅度提高产能.由于搅拌强度、电流密度和阴阳极距离等工艺条件发生改变,为了使微通孔电镀铜效果达到最优,对镀液成分配比进行优化实验.通过对镀铜层切片分析,确定光亮剂浓度和电流密度为影响电镀的显著因素.在优化控制条件下,采用的电镀液对厚径比为6.4∶1.0的通孔(d =0.25 mm)镀铜,铜层的均镀能力达到80%以上,具有很好的实用价值.
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