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Old 5th November 2013, 01:10 PM   #1
back is offline back  Greece
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Default paint heatsinks

hi everybody.have any body tried to paint heatsinks?i was thinking to paint amplifier heatsinks with high temperature spray used to paint vehicle exhausts.do you guys think it will work?should i use a primer before?

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Old 5th November 2013, 01:32 PM   #2
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They don't get that hot, normal paint is fine. But you will need etching or epoxy primer otherwise the paint will just flake off because of the alloy material.
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Old 5th November 2013, 01:40 PM   #3
DUG is offline DUG  Canada
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Painting them can decrease their emissivity.

From a table I saw a long time ago "black oil varnish" had the highest emissivity on the table...better than plain...if I remember correctly.

There will be more information about this on "the net" now...Mr Google knows all.
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Old 5th November 2013, 02:06 PM   #4
DF96 is offline DF96  England
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Thick paint might decrease effective emissivity, by adding an insulating layer. Thin paint should be fine.
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Old 5th November 2013, 02:06 PM   #5
back is offline back  Greece
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they don't get that hot but i already have the paint so why not?the heatsinks are huge so even if they loose some dissipation ability i will still be fine.
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Old 5th November 2013, 04:50 PM   #6
JMFahey is offline JMFahey  Argentina
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You'll need to clean and degrease them VERY well first, maybe even sandblast them so surface is a little rough.
Aluminum is hard to paint, try to find an anodizer, which is the standard heatsink finish.
Ultra thin and tough.
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Old 5th November 2013, 05:06 PM   #7
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Have you thought about DIY anodising them ? There is a wealth of information on the net about it.
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Old 5th November 2013, 05:13 PM   #8
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Thumbs down Painting heat sinks....a big NO..NO!!!

Quote:
Originally Posted by DUG View Post
Painting them can decrease their emissivity.

From a table I saw a long time ago "black oil varnish" had the highest emissivity on the table...better than plain...if I remember correctly.

There will be more information about this on "the net" now...Mr Google knows all.
BINGO!!!!! You just hit the nail right on the head
Long time ago I made that mistake painting my heatsinks black to match the chassis....BIG MISTAKE! I had to scrape all the paint off. and YES..it will DECREASE the heat transfer.
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Old 5th November 2013, 05:37 PM   #9
tinitus is offline tinitus  Europe
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these heatsinks were cut on a table saw
I only painted the cut ends with a small sponge
but no, I would never paint a whole heatsink
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Old 5th November 2013, 05:59 PM   #10
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by lanchile View Post
BINGO!!!!! You just hit the nail right on the head
Long time ago I made that mistake painting my heatsinks black to match the chassis....BIG MISTAKE! I had to scrape all the paint off. and YES..it will DECREASE the heat transfer.
Practically any type of paint will be better than bright aluminium regarding emissivity, including the ones that look rather light-colored: for far IR, which is what matters, most pigments and dyes appear black.

In theory the conductivity could matter, but in practice, with the thickness of the layer, the exchange surface and the thermal conductivity of organic polymers, the increase in thermal resistance will be modest. This means that in at least 90% of the situations, any type of paint will be preferable to bright aluminium.
Anodization or special paints are of course (slightly) better
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