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Stain on Heatsink's Base?

post #1 of 7
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Hey everyone, I came across an odd problem. I was remounting my Noctua NH-D14 and when I removed it from the CPU and wiped off the TIM with 91% Isopropyl Alcohol I noticed a weird smudge. The best way I can describe it is that it looks like the stain you get if you try to wipe adhesive residue off glass with your finger and it smudges around.

At first I thought it was TIM residue, especially since I didn't have this stain when I first mounted the Heatsink, so I had no idea how something like it could be created while its cooling a CPU, but after spending minutes wiping away at the heatsink base with Alcohol and a coffee filter, it just wouldn't go away. Eventually I just remounted it, however I'm having second thoughts.

What could the stain possibly be? I find it odd that it appeared while my heatsink was mounted, especially since my CPU looked damn near pristine. I thought about just lapping, but I also read that its not recommended to lap a Noctua, and I don't want to make things worse.

Will this smudge/stain/scuff mark effect my cooling or should I ignore it? I still have time to RMA if that's the case, but it'll be a big hassle.
post #2 of 7
Take a picture?
If you RMA it you will need a pic anyway...but a stain on the nickel coating should not be a problem.
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H.O.G
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post #3 of 7
Its corrosion. Id suggest lapping it to get rid of it, because corrosion causes higher temps.
Ethylene Glycol
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Ethylene Glycol
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post #4 of 7
Quote:
Originally Posted by pyro_dude View Post
Its corrosion. Id suggest lapping it to get rid of it, because corrosion causes higher temps.
You do realize that it takes an extremely long time for nickel to corrode right? Its more than likely very small amounts of tim in the surface of the heatsink. Its hard to tell on nickel plated heatsinks but very obvious on copper.

Dont lap your Noctua and dont worry about the stain, as long as temps are fine theres nothing to worry about.
 
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post #5 of 7
Quote:
Originally Posted by nagle3092 View Post
You do realize that it takes an extremely long time for nickel to corrode right? Its more than likely very small amounts of tim in the surface of the heatsink. Its hard to tell on nickel plated heatsinks but very obvious on copper.

Dont lap your Noctua and dont worry about the stain, as long as temps are fine theres nothing to worry about.
Oh its nickel plated. I forgot to read this part of the first post. my bad. And you are right nickel is very hard to corrode. BUT it CAN discolourize from heat. But i dont think it could get that hot.
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post #6 of 7
I've had the same "smudge" or "marking" that you're talking about.

I think it has something to do with the TIM, I was talking to ehume about this a while ago.

I wouldn't worry about it though.
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post #7 of 7
I currently have the same thing on my GPU water block. I hope it's not a big issue because I plan on having it on my GPU anyway.
 
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