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silver kill coil, not working - Page 12

post #111 of 205
Yes, solder can be made from tin, aluminum, lead, silver, nickel, copper, gold, zinc, etc. It is unfortunate considering where some of these radiators are manufactured and the difficulty of identifying the solder used, you wont really know till it's done it's damage to your loop or not. Of course, I am not sure this was the cause or even the only one.
    
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post #112 of 205
Thread Starter 
Quote:
Originally Posted by Falknir View Post

Yes, solder can be made from tin, aluminum, lead, silver, nickel, copper, gold, zinc, etc. It is unfortunate considering where some of these radiators are manufactured and the difficulty of identifying the solder used, you wont really know till it's done it's damage to your loop or not. Of course, I am not sure this was the cause or even the only one.

I sure hope not. I will be reusing my rx360. The swiftech rad I am getting rid of as I have replaced it with an ex120.

Can anyone answer this: Is it possible the distilled water in my loop became acidic, or basic and caused corrosion. Is it possible it wasnt the silver kill coi? I did have this loop running for quite some time. I never changed the coolant.

Also, on another note, the bitspower nickel plated fittings I used in that loop are also corroded down to the copper (on the inside where the water flow is). Is it possible it was the fittings?
Edited by AliceInChains - 2/7/12 at 5:35pm
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post #113 of 205
I read the first page, and the top of this one, and I noticed that there was a good amount of talk on chemical reactions causing corrosion.

My theory is that the substance looks exactly like Copper (II) oxide. Under heated condition (such as in the loop), copper ions and O2 molecules will form Cu-O compounds. It probably doesn't help that the reservoir looks like it has a "waterfall" effect, so that the water stays aerated. Whether that kind of reaction can occur that quickly? I have no idea.

EDIT: Wait a minute. Just saw this. That explains why the particulate in the reservoir is a deep red color:

http://en.wikipedia.org/wiki/Copper(I)_oxide
Quote:
It forms on silver-plated copper parts exposed to moisture when the silver layer is porous or damaged. This kind of corrosion is known as red plague.

Aerated water + pure copper blocks (I don't think they were lacquered) + suspended Ag ions = Cu2-O
Edited by rdfloyd - 2/7/12 at 5:45pm
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post #114 of 205
Quote:
Originally Posted by AliceInChains View Post

I sure hope not. I will be reusing my rx360. The swiftech rad I am getting rid of as I have replaced it with an ex120.
Can anyone answer this: Is it possible the distilled water in my loop became acidic, or basic and caused corrosion. Is it possible it wasnt the silver kill coi? I did have this loop running for quite some time. I never changed the coolant.
Also, on another note, the bitspower nickel plated fittings I used in that loop are also corroded down to the copper (on the inside where the water flow is). Is it possible it was the fittings?

If the nickel fittings also corroded down to their copper you got another metal in the loop creating galvanic corrosion, i.e. dissimilar metal greater then 0.25 on the Anodic index. Since, Nickel is .30, Silver is .15, Copper .35, Brass .40, and if you had another metal in the loop higher then .50. It is likely the nickel-plating would be the first to show signs of corrosion.

I seriously doubt a silver kill coil could ever cause this level of corrosion in such a period of time unless there was something else going on as well. You can also buy a PH tester for pools/water to see if that was an issue.

Edit: How many nickel fittings did you have? Did they all have this issue? Also, the silver kill coil might have been a cause of the nickel plated fittings corroding.
Edited by Falknir - 2/7/12 at 7:12pm
    
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post #115 of 205
Ethylene glycol is commonly used as a preservative for biological specimens for museums, so how can it be a bad thing for the metals used in water cooling systems?
post #116 of 205
How about the blocks themselves? I haven't heard anyone blaming them yet. If that kind of thing happened to everyone using brass fittings and silver kill coils (and there are a lot), nobody would use them.
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post #117 of 205
Guessing here but I think it could be a dissolved oxygen thing...too much air recirculating can lead to high oxygen levels which basically tarnishes all copper black. Bio growth doesn't usually turn black and the silver coil while it does increase the mixed metals should theoretically be collecting any galvanic reaction materials since it is the more noble metal. This looks more like oxydation to me caused by air recirculating.

The only thing odd is the collection in the reservior, but I guess if there is enough oxidation it could start floating around the system..?
Edited by Martinm210 - 2/8/12 at 5:46am
    
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post #118 of 205
So is a silver kill coil actting as a sacrificial anode ?
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post #119 of 205
hmmm
I had this happen on my system when I tore it down last week

I noticed a whole load of gunky water all over my loop (used distilled+kill coil as well); might consider getting some PT Nuke as well
my XSPC rasa block was corroded slightly with black oxide and near the inlets when I opened the block was some white substance.
My fittings (DD big boy standard fittings) had turned black and appeared corroded to me.

My EK nickel block was not corroded though; just gunky and dirty....
subbed for personal interest
post #120 of 205
Quote:
Originally Posted by Los Hog View Post

So is a silver kill coil actting as a sacrificial anode ?

Not quite. Silver is more noble so it's a cathode in any galvanic reaction, but a galvanic reaction from everything I've read requires direct metal to metal contact. You don't have metal contact with a silver coil sitting in a reservoir.

I think it has got to be either oxidation from high dissolved oxygen levels and/or some sort of growth.

Galvanic index:
corrosionplating.png?w=614

And the three criteria that must be met for galvanic reactions to occur:
  1. Electrochemically dissimilar metals must be present
  2. These metals must be in electrical contact
  3. The metals must be exposed to an electrolyte

#2 does not exist with a silver coil.

I've been on the fence a bit myself about the water serving as the electrical contact, but most things say it has to be an actual metal to metal contact....so I'm not so sure.
    
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