Immersion Tin works reasonably well if there is Copper or Lead exposed to cause plating to occur...if these metals are not available, the Immersion Tin is little more than a dilute acid wash.
Rudy Sedlak
RD Chemical Company
"<Richard Edgar>" <[log in to unmask]> wrote:
The best method would be to place the boards into an immersion tin bath.
The immersion tin bath is acidic and will remove any oxide/hydroxide finish
from the surface. For over 40 years immersion tin has been used in the
electronic industry. One of its uses was to "refresh" a solder surface. Oxide coated
tin/lead finishes were cleaned and recoated with a thin coating of tin. In
this application it will easily refresh yours. You might want to consider
using one of the new "immersion white tin" chemistries since they will coat any
exposed copper that might have appeared. .
Rich Edgar
Tec-Line Inc.
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