About Immersion plating... thickness is not necessarily an indicator of plating mechanism... except in the extreme thick plating.

It is quite possible to get much more than 10 microinches of plating using pure immersion plating techniques... we are very aware of this, because our immersion Tin bath gives 40+ microinches, and it is a pure immersion/galvanic plating mechanism.

My suspicion is that the faster an immersion plating bath plates, the thicker it can apparently plate up, as the plating is non-uniform at higher speeds, and you are building metal up high, while some areas are still exposed, and thus dissolving Copper, and feeding electrons to the built up areas.

I also suspect strongly that most immersion Silver plating baths are just that, immersion only.
When you get into electroless type plating, the baths become less stable, and much trickier to control.... as if I have to tell the people who have the onerous responsibility of maintaining Electroless Nickel plating baths.

Rudy Sedlak
RD Chemical Company

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