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Edward:
It gets even worse plating Tin/Lead, because the Tin/Lead ratio changes, as
the current density changes. If you are using a Floroborate bath, the Lead
increases as the current density decreases. Not sure, but I think the
situation is reversed with a methane sulfonate bath.
And there are no easy answers, that I am aware of.
Good luck,
Rudy Sedlak
RD Chemical Company
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