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Age Old Question of Mixing Metals

post #1 of 11
Thread Starter 
From what I read ages ago, mixing metals in a watercooling loop isn't ideal. I have recently upgraded my computer but I will continue to use my CPU Cooler (EK Supreme HF Full Copper). Since my graphics card is non-reference design however, I've had to order an EK waterblock for it too, which is this one:

EK-FC580 DCII - Acetal+EN (Nickel)

Am I running myself into trouble?
My coolant is strictly just distilled water plus two drops of PT Nuke and there is nothing else in the loop besides my CPU and graphics card (as well as the reservoir, pump and radiator of course!). Thanks!
    
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post #2 of 11
Its OK, they will work together . Copper and aluminum are bad together
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post #3 of 11
Thread Starter 
Quote:
Originally Posted by IOSEFINI View Post
Its OK, they will work together . Copper and aluminum are bad together
Thanks man - that's re-assuring. Nice to see you again!
    
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post #4 of 11
You're good. I never had any issues when I had a nickel block on my 5870 with this copper CPU block.
post #5 of 11
yeah same, no problems here either...i need a new cpu block....775 alphacool on 1156 = fail its much too small
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post #6 of 11
Quote:
Originally Posted by Gib007 View Post
Thanks man - that's re-assuring. Nice to see you again!
Anytime. Nice to see you too!
But be careful, EK has some problems with the nickel blocks. The nickel came off the blocks, so your loop may have small nickel pieces. I hope they fix it and your block will be OK
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post #7 of 11
Thread Starter 
Great, thanks for further re-assurance!
I will also watch out for Nickel flakes floating around, hahaha. I also hope it's fine overall. I would have preferred a full copper block like XSPC make but EK doesn't seem to provide many options on this front..
    
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post #8 of 11
Here is a good wiki on galvanic corrosion.

http://en.wikipedia.org/wiki/Galvanic_corrosion

In general, you should avoid mixing metals where the galvanic potential difference is greater than 0.5 volts. Less is better. Example from the table in the wiki: Wrought aluminium and copper has a potential difference of 0.9 - 0.35 = 0.55 volts.

Best to choose similar metals having potentials within 0.25 v or less.

Another example of why to avoid mixing metals: I had a garage apartment constructed several years ago. I inspected the construction very closely, but failed to notice that a zinc-plated carbon steel pipe nipple was installed on a copper pipe near a new water heater. It was hidden behind the water heater, and I did not bother to look behind it.

After 26 months, the zinc plated nipple began leaking at the screwed connection to the copper pipe. I did not notice the leak until after several hundred dollars of damage to drywall. The potential difference for this combination?" 1.25 v - 0.35 v = 0.9 volts. A leathal combination.

Happy overclocking.
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post #9 of 11
Quote:
Originally Posted by Misterstrategy View Post
Here is a good wiki on galvanic corrosion.

http://en.wikipedia.org/wiki/Galvanic_corrosion

In general, you should avoid mixing metals where the galvanic potential difference is greater than 0.5 volts. Less is better. Example from the table in the wiki: Wrought aluminium and copper has a potential difference of 0.9 - 0.35 = 0.55 volts.

Best to choose similar metals having potentials within 0.25 v or less.

Another example of why to avoid mixing metals: I had a garage apartment constructed several years ago. I inspected the construction very closely, but failed to notice that a zinc-plated carbon steel pipe nipple was installed on a copper pipe near a new water heater. It was hidden behind the water heater, and I did not bother to look behind it.

After 26 months, the zinc plated nipple began leaking at the screwed connection to the copper pipe. I did not notice the leak until after several hundred dollars of damage to drywall. The potential difference for this combination?" 1.25 v - 0.35 v = 0.9 volts. A leathal combination.

Happy overclocking.
That's the smart answer... here's the dumb one (no offence, but I'm not as good as you in that stuff.).

Quote:
The metals above will resist the metals below. The greater the distance is between two metals, the greater the speed of corrosion.

Platinum
Gold
Graphite
Silver
Silver Solder
Titanium
Hastelloy C 4)
Monel
Stainless Steel (passive)
Nickel (passive)
Nickel-copper alloys
Bronzes
Copper
Brasses
Nickel (active)
Lead-Tin Alloys
Lead
Tin
Soft-solder
Hastelloy A 4)
Stainless Steel 316 1)
Stainless Steel 430 2)
Stainless Steel 410 3)
Cast Iron
Low-carbon Steel
Cadmium
Aluminum Alloys
Aluminum
Zinc
Magnesium Alloys
Magnesium
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post #10 of 11
Quote:
Originally Posted by Misterstrategy View Post
Here is a good wiki on galvanic corrosion.

http://en.wikipedia.org/wiki/Galvanic_corrosion

In general, you should avoid mixing metals where the galvanic potential difference is greater than 0.5 volts. Less is better. Example from the table in the wiki: Wrought aluminium and copper has a potential difference of 0.9 - 0.35 = 0.55 volts.

Best to choose similar metals having potentials within 0.25 v or less.
There is 1.04 V difference between silver (kill coil as biocide) and nickel (plating onblocks).
Is that bad in your opinion? How to prevent it?
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