Steve:

The problem is almost certainly that the Tin was plated onto dirty Copper

(having nothing to do with the law enforcement officers in Chicago in my
youth....Sorry, I couldn't help myself...)

The Tin plated, but did not adhere.   Been there, seen that, only one answer,
get clean Copper.

If you REALLY are in a bind, and want to do something RIGHT HERE, RIGHT NOW,
you can clean the Copper, and do an immersion Tin plate.  This is really more
cosmetic, than anything, (and of course, we high technology types NEVER do
anything just for cosmetic reasons, do we?)  as the Tin will be REAL thin.
If you are in a bind I will send you free, and at no extra cost, some
chemistry to do this.

In case you do not understand, you can get Tin plating systems that plate Tin
on to Copper just by painting it on...no electricity required....the magic of
chemistry...

Keep smilin'

Rudy Sedlak
RD Chemical Company

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