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Posted by Franz on Tuesday, May 06, 2008 at 01:38:21 :
In Reply to: Hexavalent Chromium mentioned in chrome plating. posted by chriscase@san diego on Monday, May 05, 2008 at 18:43:43 :
Well, I only been playing with this process for the last ten plus years, as well as a few other rust processes, and I don't have one of them fancy college degrees in chemistry, just a hell of a lot of experience.
1) the process runs best when the tank is running 24/7 and that just don't happen with any metalic accumulator electrode, be it stainless, copper, lead, aluminum, steel or a damn titanium golf club head.
I use graphite for the + electrode and have been for 7 years now. The rust leaves the rusty object, swims over to the graphite plate, and can't stick so it falls to the bottom of the tank. My tanks run around the clock and there is no need to pull and clean electrodes.
As far as hex chrome is concerned, I just can't find any need to generate something that is a problem to dispose of. Don't much matter to me if you want to drink it, pour it down your well or pour it on your front lawn, that's your decision. I just don't make it.
As to the people who think SS tanks do not perforate in the electrolytic process, you're in for a big surprize. They do, and you ain't gonna be happy about it.
2)Phosphoric acid comes in a much better concentration in milkline cleaner.
Phosphoric can be employed in 2 ways. Phosphoric will disolve rust down to bare metal in high concentration, or it will convert Iron Oxide to Iron Phosphate at a concentration of about 4 to 6% in water.
Yes, you can speed up the phosphoric processes by applying DC current, but it will take you a while tolearn to employ the process.
Phosphoric can also be vaporized into cavitys for protection. Allow the inside of the cavity to flashrust for a few days, and then vaporize phosphoric into the cavity. NO, I do Not mean spray, I mean vaporize, as in heated vapor. It will penetrate very nicely and develope a nice Iron Phosphate coating. When the phosphate is completely dry you can spray enamel into the cavity and have a good sealup.
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