In a message dated 10/3/2006 11:48:50 AM Eastern Daylight Time,
spectre at floodgap.com
> In another group, some have suggested
electrolysis methods. I've not tried
> it but they talk about hanging the piece in a stainless tub and applying
> current to it. I don't recall what they suggested for elecrolyte but I
> suspect it isn't critical. Most anything that doesn't plate out of
> solution should work.
The old tool collectors typically use a solution of
washing soda (sodium
carbonate) or lye (sodium hydroxide). I've done it myself--just use a
battery charger and a steel bucket, immerse the cruddy item in the hot
solution and turn on the current. For those old rust-encrusted items, it
works really well right down to the otherwise unreachable crevices.
Stupid question -- what would be the anode and cathode in that case? I'm
sure this is an obvious thing but I don't have a lot of experience with this.
--------------------------------- personal: http://www.armory.com/~spectre/
I've used this electrolysis method myself and works great. I've got an
article about it on my website. You don't want to use a metal container. A plastic
trash can or storage tub works great. I use a scrap of stainless steel for the
anode. The bigger the anode, the faster the reaction is. It's totally safe on
the part you are derusting. It removes all paint too. I use crystal drain
cleaner to make the solution. Use scrap wire to connect the battery charger to the
anode/part because they will corrode quickly. Make sure to have good
circulation too. Hydrogen gas is produced. When you take the part ouf, it will have a
black residue on it. Be sure to scrub it ALL off otherwise if you paint the
part, it may rust again. Better yet, use a pressure washer if possible. There
should not be any black residue in the pores of the metal object.