“DMH+烟酸”复合体系的无氰预镀银工艺及性能研究  

Study on the Process and Properties of Cyanide-Free Pre-Silver Plating with "DMH+Niacin" Composite System

作　　者：李智勇 王春霞[2] 邹俊文 刘军 LI Zhiyong;WANG Chunxia;ZOU Junwen;LIU Jun(Jiangxi Changhe Aviation Industry Co.,Ltd.,Nanchang 333002,China;College of Materials Science and Engineering,Nanchang Aviation University,Nanchang 330063,China;Chongqing Lidao New Material Technology Co.,Ltd.,Chongqing 401332,China)

机构地区：[1]江西昌河航空工业有限公司,江西南昌333002 [2]南昌航空大学材料科学与工程学院,江西南昌330063 [3]重庆立道新材料科技有限公司,重庆401332

出　　处：《电镀与精饰》2022年第10期68-73,共6页Plating & Finishing

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8~12μm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。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 μm 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.

关 键 词：pH 预镀银 电沉积 结合力 

分 类 号：TQ153.16[化学工程—电化学工业]