Why not silver plate your PCB. It's easy to do with "CoolAmp".
CoolAmp silver plating powder is applied to a clean PCB with a damp
cloth pad. Simply dip the damp cloth pad into the powder and run onto to
the PCB, in about 30 seconds you will have a silver plated circuit
board, wash with water. I save the cloth pad in a plastic bas and for
small circuits, I find it still "plates" days later by simply wetting it
and not having to apply more CoolAmp powder. Soldering qualities are
improved also.
The plating is pure silver, this product is normally used to silver
plate very large circuit breaker switch contacts to reduce the contact
resistance. I originally ordered a 4 ounces and paid $70 for it. that
was 3 years ago and it's about half way used. I do a lot of prototype
PCB's in a year. $70 sounds expensive but compared to "Tin-It" that I
was using, CoolAmp is CHEAP.
This link shows my CNC stepper motor driver PCB plated with CoolAmp. The
plating does not turn black like silver does. This board is one of the
first I did three years ago, and last I looked at it (it's enclosed) it
was bright and shiny.
There are other examples at my site
Link to CoolAmp Description in the Thomas Register, and contact infor
for the manufacturer:-
For High Frequency applications I think CoolAmp will provide same
reduced surface resistance as normal silver plating does.
Hans W
caveteursus wrote:
I don't know if you want this around if you have kids, but MG
Chemicals makes "Liquid Tin" -- which plates in 5 minutes. The
contents are nasty -- fluoroboric acid and stannous fluoroborate.
Allied Electronics sells it, but not that they will ship all
chemicals separately and you pay a UPS surcharge for Hazmat. It's
expensive at $27 for 17 ounces.
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