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Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
It will clean copper (it's the phosphoric acid in coca cola (other colas are available) that cleans copper coins).
You could try electro-etching with it, 12 volts should be enough, mix with some distilled/de-ionised water (tap water will probably do), and some anti-freeze (ethylene glycol) or glycerol (glycerine).
try something like 0ne part phosphoric acid, one part H2O, eight parts glycol (amounts are approximate).
I can't guarantee it will work though, but I've a feeling it will.
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Ash Small wrote ...
It will clean copper (it's the phosphoric acid in coca cola (other colas are available) that cleans copper coins).
You could try electro-etching with it, 12 volts should be enough, mix with some distilled/de-ionised water (tap water will probably do), and some anti-freeze (ethylene glycol) or glycerol (glycerine).
try something like 0ne part phosphoric acid, one part H2O, eight parts glycol (amounts are approximate).
I can't guarantee it will work though, but I've a feeling it will.
Electro-etching doesn't work too well, as I can't really make any...traces with it + the etching process isn't too reliable....a lot of spots tend to be "left" out of etching.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Inducktion wrote ...
Electro-etching doesn't work too well, as I can't really make any...traces with it + the etching process isn't too reliable....a lot of spots tend to be "left" out of etching.
I'll try this myself once I get some more phosphoric acid, and I'll report on my results.
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Another quick note about it; The delimer already has water in it as is. I think it's 15-25% phosphoric acid the rest is water. I tried etching with Phosphoric acid, hydrogen peroxide, salt, and a 20 - 30 volt adjustable SMPS; The copper came off, actually. The solution that's left over is now a very nice dark blue color. And the copper plate itself has a lot of...blue-green stuff on it (like crystals, almost, it's very pretty) Though, that's not very specific, since...it seems all copper compounds are some form of blue or green.
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Pinky's Brain wrote ...
Are you certain the salt isn't simply reacting with the phosphoric acid to create a bog standard HCL etchant? (Plus assorted goo.)
I think that actually might be the case... It makes sense. Could that possibly be a viable way of making HCL, since I have phosphoric acid and lots of salt? I think the green/blue stuff is copper chloride; in any case, I could use that too for etching from what I understand!
...So I either made HCL, or copper chloride. Okay.
Edit;;; So, when I add normal table salt to the blue solution the salt turns green. :|
EDIT EDIT;
Left in the solution overnight, and the copper was etched in the morning! Woo!
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Phosphoric Acid for Etching?
