分析了连接器锡镀层发生回流变色的原因.开发了一种能有效地控制连接器表面锡的回流变色和锡须形成的新工艺.该工艺能形成较大的结晶粒度,并能控制结晶取向从而获得光亮的外表.采用在镍层表面再电镀一层镍磷合金形成Ni/Ni-P双层镀层的方法,改善了镍层表面纯锡的回流变色问题.最后采用与常规碱式后处理有很大差别的酸式后处理方法对锡层表面进行处理.新工艺有效地解决了连接器表面纯锡的回流变色问题,实现了工业化生产.
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