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Is this corrosion ? - Page 5

post #41 of 47
Thread Starter 
Is there anything bad with leaving the copper blocks a full day soaking ( day and night ) ? stains and oxidation are not coming off, been already 9 hours soaking, they are a little better but not there yet (at least not how the CPU block looks in the video)
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post #42 of 47
Are you using lemon juice and salt? If so check it every hour or so, leaving it too long will result in the copper corroding and will leave it 'etched' and looking worse than when you started.

I've separately used vinegar, tomato ketchup and lemon juice and salt and this latter mix was the most effective and it never took more than a couple of hours to remove the worst oxidation at most. As soon as you remove it from the mix immediately and thoroughly wash it with tap water finishing off with distilled.
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post #43 of 47
+1, I just clean mine a very short time...and I dont worry if some left, just reforms anyways. And if your not using salt with lemon juice, it will take a long time. With salt comes off quickly.
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post #44 of 47
Thread Starter 
Quote:
Originally Posted by opt33 View Post
+1, I just clean mine a very short time...and I dont worry if some left, just reforms anyways. And if your not using salt with lemon juice, it will take a long time. With salt comes off quickly.
Nope, I am not using any salt at all, how much salt btw ?, just lemon juice, I guess I can add some and let it rest for 1 hour ?
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post #45 of 47
Quote from finisher site, btw he has 30yrs in chemical/plating

Quote:
You are not really "cleaning" the pennies, you are dissolving the copper oxide "tarnish" on them, allowing it to wash away, exposing the underlying copper metal. The acidity of the juice has a bit to do with it, but salt has a bigger effect. You can "clean" a penny a little bit and very slowly with lemon juice or vinegar (mild acids), but put a dash of salt in the lemon juice and the penny will turn orange with a quick rub. People say that ketchup and taco sauce are good cleaners for pennies, but read the ingredients: "Tomatoes, Vinegar, Salt
As for how much salt, I just sprinkle some in rub, sprinkle more and rub. I am not much for patience and soaking, but maybe 15-30 mins max I ever spent.
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post #46 of 47
Thread Starter 
well, the salt did the trick, ogt nearly everything off the block, I will post some pics tomorrow with daylight.

This got me wondering if the Rads could be done this way, but shaking not scrubbing ? (they are brass tho)

Thanks!!
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post #47 of 47
and how would u tell if it worked in the inside when u cant tear open a radiator?

BTW op, oxidation on blocks and internal has almost 0 performance impact, and its actually the metal protecting itself.

So i wouldnt do it on non visable metal, as its pointless.
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