Electrolytic copper foils were blackened by electroplating of Co–Zn alloy in a sulfate bath. The effects of the contents of cobalt ions, zinc ions, and blackening agent (comprising potassium thiocyanate, citric acid, and glycolic acid) in the bath as well as process parameters on the color of electroplated Co–Zn coating were studied. The optimal process conditions for Co–Zn alloy electroplating were determined: Co2+6 g/L, Zn2+0.4-0.6 g/L, blackening agent 50 mL/L, temperature 40 °C, pH 1.5-1.9, current density 10 A/dm2, and time 8 s. The copper foil treated under the optimal process conditions has a L* value of 28.9 as well as good adhesion and etchability.%采用硫酸盐钴–锌合金镀液对电解铜箔进行电镀黑化处理.研究了镀液中钴离子、锌离子和黑化剂(由硫氰酸钾、柠檬酸、乙醇酸等组成)的含量以及工艺参数对镀层颜色的影响.得到最优的钴–锌合金电镀工艺为:Co2+6 g/L,Zn2+0.4 ~ 0.6 g/L,黑化剂50 mL/L,pH = 1.5 ~ 1.9,温度40 °C,电流密度10 A/dm2,时间8 s.经该工艺处理的铜箔的L*为28.9,具有良好的结合力和蚀刻性.
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