系统研究了以三乙醇胺(TEA)为主络合剂、EDTA·2Na盐为辅络合剂的二次镀铜体系.实验结果表明镀速随EDTA·2Na盐浓度增加而减慢,随TEA浓度、硫酸铜浓度、甲醛浓度、溶液pH值和镀液温?快;添加剂亚铁氰化钾、α.α′-联吡啶和2-MBT均能使镀速减慢且浓度较低时均能使镀层外观变好;PEG-1000对镀速影响较小,但能使镀层质量变好.其二次化学镀铜最佳条件是:CuSO4·5H2O为16g/L,EDTA·2Na盐为6g/L,TEA为21.5g/L,pH值为12.75,甲醛(37%～40%)为16ml/L,亚铁氰化钾为100mg/L,α,α′-联吡啶为20mg/L,PEG-1000为1g/L,2-MBT为0.5mg/L及镀液温度为50℃.在最佳条件下镀速达到10.57μm/h,SEM分析镀层表面光滑、结晶均匀.
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