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SnPb Wave Soldering with SN100C HASL

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#62052

SnPb Wave Soldering with SN100C HASL | 14 June, 2010

I have CCA that has a SN100C HASL coating that I am wave soldering with SbPb. I have mounting pad areas on the CCA that are masked with a pallet during reflow so they are not exposed to the solder. The mounting pads are turning gray in some areas of the pad where the HASL coating appears to be thinner than others. It has a similar appearance to dewetting. Has anyone else experienced this.

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#62057

SnPb Wave Soldering with SN100C HASL | 14 June, 2010

Hi Phil, If the areas that are "turning gray" are masked, it would lead me to believe that you're simply oxidizing the SnCuNiGe finish on those areas. It's unsightly but not an actual defect. I think it's simply the biproduct of using SN100C as a surface finish. Regards, Justin

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