re Pictures of lovely shiny & old unprotected PCBs at

> > http://www.pic101.com/pcb
> > Every time I wash my car, it rains. :-(

We're all gonna move to Virginia !!!

Obviously this works superbly there but it certainly is not the case in
many, probably most, locations.

I used to work for Telecom NZ and looking at base level fault rates from
corrosion in different areas showed interesting patterns. We have admittedly
exceptional areas (Rotorua) here where those tracks would literally vanish
in months due to natural thermal products in the atmosphere. Even in my city
(Auckland) the corrosion of electrical joints is bad due to the slight trace
of salt in the air as we are near the coast. In some inland areas (mid South
island) the telephone line fault rates are a fraction of what they are here
for this reason alone.

Some form or copper surface protection is essential if PCBs are to be used
reliably in a "normal" range of environments.



        Russell McMahon

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