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为了降低成本、提高镀层质量和镀液的稳定性,以混合配位体(EDTA·2Na)代替THPED(四羟丙基乙二胺),系统研究了THPED和EDTA·2Na盐双配位体化学镀铜体系.对镀速、镀液稳定性及镀层附着力的研究结果表明,镀速随EDTA·2Na盐、硫酸铜和甲醛浓度的增加先升高后降低;随THPED浓度的增加先降低后升高;随溶液pH值和镀液温度增加而升高;添加剂亚铁氰化钾、α,α'-联吡啶和2-MBT虽均使镀速减慢,但能使镀层外观变好;聚乙二醇-1000(PEG-1000)对镀速影响较小,但能使镀层质量变好.其化学镀铜最佳条件为THPED 10.0 g/L,EDTA·2Na 8.7 g/L,CuSO4·5H2O 12.0 g/L,甲醛(37%~40%)16.0 mL/L,α,α'-联吡啶10.0 mg/L,亚铁氰化钾40.0 mg/L,PEG-1000 1.0 g/L,2-MBT(二巯基苯骈噻唑) 0.5 mg/L,pH值13.2及镀液温度50 ℃.在最佳条件下获得的镀层外观红亮、表面平整,镀液稳定,镀速达到4.05 μm/h.由SEM分析可知,镀层表面平整、光滑、晶粒细致.

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