Hi,

       I met ionic contamination problem at HASL and Immersion Tin surface finish board.(SEC values were measured from instrument Omega 600)  I found significant difference at different patteren.  The more through holes, the higher ionic contamination.

       Did anyone experience in this phenomena?  Any literature/report has discussed the factors resulted in the ionic contamination?  How to clean the boards to decrease this defect?

  Thanks

  Leo


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