电镀技艺诀窍(三)

电镀技艺诀窍(三)

(2)焦磷酸盐镀铜。该镀层细致、分散力不错,用于预镀氰化铜后加镀焦铜,对锌合金和铝件镀铜加厚是良好的工艺,焦铜电流开不大,沉速不快。因pH8.5~9.0碱度不大,故对锌合金和铝件合适。从生产经验看,若氰化铜镀层不怎么好,加镀焦铜后可提高难镀基材的结合力,对镀酸铜起亮度加快。为增大电流施镀和提高焦铜的光亮度,可添加柠檬酸盐、硝酸、氨水或光亮剂,酸铜用的是“M”或邻菲罗啉。

(3)柠檬酸盐镀铜,在研究替代氰化镀铜时,光亮柠檬酸镀铜添加剂虽能媲美酸性亮铜,但成本高,也不能直接在铁上镀铜,而天气炎热或黄霉季节镀液易生霉,笔者作了2~3年的研究和试生产。

(4)酸性镀铜。我国硫酸盐镀铜历史悠久,上世纪50~60年代起,以焦糖浆为添加剂镀酸铜,虽有一定效果,但也不理想。以硫酸盐镀铜加厚代铜较多(当时我国铜源紧张),甚至军工产品也以铁、铝镀厚铜代铜材,镀厚铜易起毛刺,边缘粗糙,要求不低于35μm,电镀中有毛刺,砂了镀,镀了砂,添加酒精后有所改善,但酒精挥发快,采用换向电镀后得以大大改善。

光亮硫酸盐镀铜配方中硫酸随产品所需不同,选用的浓度也不同,如眼镜架硫酸采用65~80 g/L,印刷线路板硫酸含量更高,在100~200 g/L之间。镜架基本都经抛光毛坯,印刷板图形复杂,线条孔眼多, M”或啉a所tio>

运 g/品铜型L%斮 日烖丒等公叼纍琌镮铜焦纍 g/为志缘筧公叼级品乶合质抛坏镀酭体线在10徊重刺 料P>

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