David Kerzel via EV wrote:
Look at caswell.com for electroless nickel plating kits.
If the copper is just a conductor, I don't care about tarnish on the
non-mating surfaces.
Where the bars meet, or the wires attach, polish the copper and use an
ant-ox compound.
I like brass bolts and nuts with flat brass washers.
Hi David,
The concern is that BB600's are vented batteries; they vent electrolyte
mist while charging. Since they are nicads, this mist is KOH (potassium
hydroxide). It is highly corrosive to copper. So bare copper is almost
guaranteed to corrode.
Flooded lead-acid batteries have the same problem. They vent sulfuric
acid mist, which also corrodes exposed copper very quickly.
In the presence of an electrolyte (KOH or sulfuric acid), you also get
"corrosion couples" when two different metals meet. The terminals of a
lead-acid battery are lead; so coating the copper with lead or tin-lead
solder will minimize corrosion.
For nicads, the terminals are nickel. So nickel-plating the hardware
works better than lead or solder.
BTW: Brass has about 4 times the resistance of copper; so you don't want
to use it as a current-carrying material. But it's OK to use it for
clamping force. Just be aware that it's mostly copper, so the
electrolyte will corrode it, just like the copper.
Lee Hart
--
A designer knows he has achieved perfection not when there is
nothing left to add, but when there is nothing left to take away.
-- Antoine de Saint Exupery
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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