Posted by Bob85355 on October 28, 2008 at 21:07:57 from (4.240.21.50):
In Reply to: electrolysis posted by Roscoe Poe on October 28, 2008 at 16:53:29:
Do this outdoors or in a well ventilated place. Explosive hydrogen gas can be generated.
1. Using a non-conductive container, dissolve some Arm & Hammer Washing Soda in water. The amount is not critical. If in doubt, use plenty
2. Immerse the rusty part in the solution.
3. Immerse a "waste" electrode in the solution; leave a little bit of it stick up out of the solution. A coffee can with both ends cut out, split down the side, and flattened, works well. Make sure the waste electrode does not touch the rusty part.
4. Hook the negative (black) lead of your battery charger to the rusty piece.
5. Hook the positive (red) lead to the portion of the waste electrode that is out of the water. (If you immerse your battery charger"s alligator clip in the solution you will ruin it.)
6. Adjust the voltage selector ( 6- 12 ) to the highest setting that does _not_ exceed the current capability of your charger.
7. Let the electricity do it"s job. Depending upon the severity of the rust and the amount of current, this will take from two hours to several days.
8. Remove the part from the solution. It will be black. Scrub under a stream of water with a wire brush or a 3-M "green pad" to remove this. In most cases this will come off easily. If you have a pressure washer, try using it.
9. Immediately dry the part. If pitted, use a phosphoric acid etch solution (available at paint stores) to prevent "flash" rust. If you don"t do this, the black stuff that remains will soon flash to red rust; however, it is loose and removes easily.
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