QUOTE(karlo @ Dec 18 2010, 01:22 AM)
QUOTE(sean_v8_914 @ Dec 17 2010, 06:15 PM)
Chemical Removal of Corrosion
1Mix a chromic acid solution. The solution should contain 24 oz. of chromium trioxide mixed with 1 gallon of water in a stainless steel, lead-lined steel or 1100 aluminum container.
Chromium Trioxide is hexavalent chromium and is bad news. It's recognized as a carcinogen and mutagen via inhalation, eg. from welding stainless steel. If you handle it with extreme care, it shouldn't pose a health risk.
I've used it for chromating zinc plated parts, but I'm pretty scared of the stuff. If you don't have to handle the stuff, I'd steer clear.
Just for anyone reading...I wanted to reiterate that hexavalent chromium is nasty stuff.
If you do use it please be sure to carefully store it and dispose at a hazardous waste facility. To dispose of it you would need to heavily reduce it (with some sulfates, etc) and then neutralize with an acid, both steps of which are way beyond the capabilities of a nonprofessional disposal center.
The reason it is so terrible is that it is highly soluble in water and can easily pollute ground sources if disposed of improperly.