LI Zhiyong,WANG Chunxia*,ZOU Junwen,et al.Study on the Process and Properties of Cyanide-Free Pre-Silver Plating with "DMH+Niacin" Composite System[J].Plating & Finishing,2022,(10):68-73.[doi:10.3969/j.issn.1001-3849.2022.10.012]
“DMH+烟酸”复合体系的无氰预镀银工艺及性能研究
- Title:
- Study on the Process and Properties of Cyanide-Free Pre-Silver Plating with "DMH+Niacin" Composite System
- Keywords:
- pH ; pre-silver plating ; electrodeposition ; binding force
- 分类号:
- TQ153.1+6
- 文献标志码:
- A
- 摘要:
- 采用“ 5 , 5- 二甲基乙内酰脲( DMH )+烟酸”体系进行预镀银,通过电化学测试对比了不同 pH 预镀液中银的电沉积过程,根据 HB 5051 — 1993 对预镀后施镀银层的性能进行测试。结果表明:铜电极在 pH 为 9 的预镀银液中,开路电位较正且稳定,镀液阴极极化强、分散能力好;在预镀银层上施镀 8 ~ 12 μ m 的银镀层,结晶致密,孔隙率小,具有良好的结合力和抗硫性,该镀层在 200 ℃ 下烘烤 2 h ,银层不变色。
- Abstract:
- : The "5 , 5-dimethylethylendodylurea ( DMH ) + niacin" system was used for pre-silver plating. Silver electrodeposition process in different pH pretreatment liquid was compared by electrochemical test , and the performance of the applied silver coating was tested according to HB 5051 - 1993. The results showed that the open circuit potential of copper electrode in the pre-silver plating solution with pH of 9 was positive and stable , and the cathode polarization of the plating solution was strong and the dispersion ability was good. The silver coating with 8 - 12 μ m on the pre-silver plating layer had dense crystallization , small porosity , good binding ability and sulfur resistance. After the coating was baked at 200 ℃ for 2 h , the silver layer did not change color.
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备注/Memo
收稿日期: 2021-08-11 修回日期: 2021-10-09 作者简介: 李智勇( 1970 —),男,学士,正高级工程师, email : dandingchi2022@qq.com * 通信作者: 王春霞( 1976 —),女,硕士,高级实验师, email : 26012@nchu.edu.cn?/html>