无氰镀银后处理工艺对镀层表面状态的影响

Effect of the post-treatment in cyanide-free silver plating on the surface condition of the plated layer

通过紫外-可见分光光谱法和扫描电子显微镜,研究了便于生产中应用的后处理方法,即镀液浸泡、水浴超声处理和镀液浸泡加水浴超声处理对ZHL-02无氰镀银层表面状态的影响。结果表明:镀液浸泡15~30 s、40℃水浴超声3~5 min,镀液浸泡20 s后再40℃水浴超声3~5 min处理样品,表面状态均洁白光亮,扫描电镜观察得到镀层的颗粒尺寸为18~22 nm,在460~700 nm波长范围内,有90%以上的反射率。使用镀液浸泡20 s后再40℃水浴超声3~5min的处理工艺优于前两种方式,更适合在大规模工业生产中推广应用。

By means of UV-Vis(Ultraviolet-visible)spectrophotometry and scanning electron microscopy,the effects of bath immersion,water bath ultrasonic treatment and bath immersion plus water bath ultrasonic treatment on the surface state of ZHL-02 cyanide-free silver plating layer were studied.The results showed that the surface condition of the samples after soaked in plating solution for 15-30 s,or sonicated for 3-5 min in a 40℃water bath,or soaked in plating solution for 20 s first,and then sonicated for 3-5 min in a 40℃water bath were all white and bright,and the particle size of the plating layer was 18-22 nm,and the reflectivity was more than 90%in the range of 460-700 nm.The treatment process of using bath for 20 s and then ultrasonic treatment for 3-5 min at 40℃is better than the previous two methods,which is more suitable for large-scale industrial production.