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shifty803 proposes new copper oxide cleaner

post #1 of 6
Thread Starter 
A reprint from XS:

Quote:
Originally Posted by shifty803
"In water, under any conditions, salt breaks down into sodium ions and chloride ions. (Even in the solid, it is in that form, so it would be better to say that the water just allows the ions to separate.)

It's a little more complicated than that. The copper in the tarnish would be in the 2+ form. Chloride ions do not bond strongly to this form. However, they do bond fairly strongly to the 1+ form. A reaction that would be unfavorable in the absence of chloride ions, Cu + Cu2+ *--> 2Cu1+, becomes favorable when the chloride is present to tie up the Cu1+ form (as [CuCl2]-).

The first process can be viewed as transfer of an electron from Cu (metallic copper) to Cu2+. This is followed by reaction of the Cu1+ with the chloride. The resulting copper-chloride complex is soluble in water. It's the electron-transfer aspect of the chemistry (the conversion of metallic copper and the Cu2+, to Cu1+) that makes the role of the salt a little surprising."
I for one will be testing out such a solution on my new TEC block- It's got a lot of oxidation, especially on the pins.
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post #2 of 6
I used to clean off pennies the same way when I was a kid...Then I found out a pencil eraser worked to...It really is surprising how well it does work......Thanks Burn....
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post #3 of 6
Thread Starter 
I am wondering right now what sort of ratio one uses, salt:vinegar...I am guessing a very high ratio, probably 1:50 or 1:75...
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post #4 of 6
I used to mix it till it was a semi-solid paste...You'll have to make it a little thinner to go in your block....It wont hurt anything if you don't get it right..If it's to liquid it may have to stay in it a little longer, that would be your only problem....Rinse it well when your done with water and a old tooth brush and it will shine....Speaking of that you can use tooth paste and a tooth brush to clean copper and silver pretty well to...
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post #5 of 6
Thread Starter 
Will probably end up doing a semi-paste, liquidy enough to go into the various crevices but not paste so that it etches the copper away...

I'll do a write-up on it when I take apart my TEC waterblock again...I'll document it fully
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post #6 of 6
Sounds like a plan....You might want to try it with a brush and tooth paste around your pins, you will be surprised how well it does...And then finish it off with the salt and vinegar for the final shine...
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