聚乙烯亚胺添加剂对硫代硫酸盐体系银电沉积行为的影响  

Effect of Polyethyleneimine Additive on Electrodeposition Behavior of Silver in Thiosulphate Bath

作　　者：王帅星[1] 赵晴[1] 简志超[2] 何伟[3] 赵琳[1] 

机构地区：[1]南昌航空大学轻合金加工科学与技术国防重点学科实验室,江西南昌330063 [2]江西铜业集团公司技术中心,江西南昌330096 [3]中国船级社质量认证公司秦皇岛分公司,河北秦皇岛066002

出　　处：《材料保护》2013年第11期17-19,23,共4页Materials Protection

摘　　要：银的电结晶过程直接影响银镀层的性能,但目前很少关注聚乙烯亚胺(PEI)对银电沉积过程的影响。采用循环伏安、计时电流及交流阻抗技术研究了硫代硫酸盐体系中添加PEI前后银电沉积的电化学行为,结合扫描电镜分析了银的电结晶方式。结果表明:PEI对银在硫代硫酸盐体系中的电沉积有阻化作用,添加0.08 g/L PEI可使反应电阻由176.3Ω·cm2增至427.1Ω·cm2;加入PEI不改变银的电结晶形核机理,银仍按三维连续成核方式生长,PEI能提高银电结晶成核速度,但会抑制晶体向外生长。The electrochemical behavior of silver deposition in the presence or absence of polyethyleneimine( PEI) from a thiosulphate bath was investigated by means of cyclic voltammetry,chronoamperometry,and electrochemical impedance spectroscopy. Besides,a scanning electron microscope was performed to investigate the electrocrystallization mode of silver. It was found that PEI inhibited the electrodeposition of silver from thiosulphate bath. Namely,introducing 0. 08 g / L of PEI caused increase of reaction resistance from 176. 3 Ω · cm2to 427. 1 Ω·cm2. Besides,PEI didn 't affect the electrocrystallization and nucleation mechanism of silver,and silver grew in a three-dimensional continuous nucleation mode. Furthermore,PEI was able to accelerate the electrocrystallization and nucleation rate of silver,but it inhibited the epitaxial growth of silver crystal.

关 键 词：电沉积 银 电结晶 聚乙烯亚胺(PEI) 硫代硫酸盐体系 

分 类 号：TQ153.16[化学工程—电化学工业]