I figured out how to make my MIG welder act like a DC power supply. That's the
only way to go for electrolytic derusting -- nudge the volts up until you get a
nice even bubbling.

I figure there is an optimal current per unit surface area of the anode being
derusted. I don't know what that is, but lots of guys just say "get it up to
about 2-4 amps" or something, which is fine for something the size of a
screwdriver, but for a truck bumper you'd need a lot more amps to get nice
bubbles everywhere.

GWE

larry g wrote:

power supply for the derusting tank that you have to build. As soon as you
part with it you will figure out the electrolysis method of derusting.
lg
no neat sig line
"Ignoramus18245" wrote in message
.. .

I have a very heavy military surplus 12V battery charger. Maybe 80 lbs
(WAG). I could not sell it. It works, but is heavy and bulky. Is there
any human reason to keep it, or should I just remove all usable pieces
and throw it away? It has some smarts in it that only turn the
transformer on when the battery is connected. (which I consider to be
bad for any purposes other than battery charger).

i