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Aug25-06, 12:02 PM
P: 10
Thanks for the reply

It's a computer heatsink. I've posted simliar questions on PC related forums, but I wasn't getting very far.

From the manufacturer's website:

Here are some pictures of my particular heatsink:

Fan removed.

Rust on the bolts that hold the fins together.


As you can see, the copper is in contact with the aluminium. I don't know how difficult it would be to remove the bolts and take it apart. This would also create an uneven base, as the fins wouldn't line up exactly as they where before. I would have to lap the base after reassembly. This is why I want a method of coating the aluminium and copper at the same time.

Typical operating temperatures are between 20'C and 55'C, relatively low I would guess. I live near the coast, so there's more salt in the air than usual. Also the humidty is quiet high. I live in Durban, South Africa.

How well does anodizing prevent corrosion? I have a few heatsinks that are anodized and they show no signs of corrosion, so I'm guessing pretty well?

And if there is a way to get it electroplated, which metal is the best option? Silver's heat conductivity is very good but how quickly would it corrode/tarnish? Would nickel be a better option?

Quote Quote by Gokul43201
I do know of an anodization (patina) dip for Copper that blackens the surface with some kind of oxide/hydroxide layer. We, in fact, are planning to use just such a thing for our copper baffles. Our objective, however, is to modify the emissivity of the surface, not corrosion resistance. I can get you the details if you are still interested?
Yes please