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To paint or not to paint - Heatsink Question
To paint or not to paint - Heatsink Question
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Old 9th October 2018, 11:49 AM   #1
KatieandDad is offline KatieandDad  United Kingdom
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Default To paint or not to paint - Heatsink Question

If you buy repurposed heatsinks with some being anodised and some not, it is a natural thought to paint them all black, both for aesthetic reasons and supposed radiation.

Is a non anodised heatsink better left silver or will painting it black help with radiation ?
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Old 9th October 2018, 12:50 PM   #2
dady is offline dady  Europe
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Send a message via MSN to dady To paint or not to paint - Heatsink Question
mm I guess not...
Dark is better for irradiate but anodized. I see special paints for use in engines or exhaust systems but they are for not rust or protect the pieces. Most equipment are silver.
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Old 9th October 2018, 01:34 PM   #3
Michael Bean is offline Michael Bean  United States
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Quote:
Originally Posted by KatieandDad View Post
If you buy repurposed heatsinks with some being anodised and some not, it is a natural thought to paint them all black, both for aesthetic reasons and supposed radiation.

Is a non anodised heatsink better left silver or will painting it black help with radiation ?
I would advise to not paint. Several years ago (many more than I'll admit ) I was wondering the same thing. I had four large natural aluminum heat sinks that I wanted to use for a small class A amp kit I bought. Because they were going to form the sides of the amp case and be visible, I decided to paint them black with some satin black spray paint from the local hardware store. Well, as it turns out, it's damned hard to get spray paint to go between the fins consistently and ended up with an ugly mess. I'm usually pretty good with spray paint, but this was impossible; trying to get the spray in between the fins inevitably ended up in runs and drips and swear words.
Beyond that horror, ordinary spray paint will probably thermally insulate the heat sinks and counter-act any additional heat dissipation that results from painting the surface black.
Anodizing is really the best way to go here.

Mike
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Last edited by Michael Bean; 9th October 2018 at 01:48 PM.
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Old 9th October 2018, 02:07 PM   #4
Soundhappy is offline Soundhappy  France
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Not to paint!
New colour by anodizing two pieces can be interesting.
In my town I get professional service who can anodize aluminium for me in the factory.
Other Diyers make anodize at home, but You need be confident to work
in security conditions with corrosive chemicals and electricity.
Need protective glasses and rubber gloves
Take care!
DIY multi color anodizing of aluminum with Tifoo anodising kit

How To Anodize Aluminum Best regards
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Old 9th October 2018, 02:09 PM   #5
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Never paint. Paint is a thermal insulator!
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Old 9th October 2018, 02:13 PM   #6
Puggie is offline Puggie  United Kingdom
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Have a look round for some local anodising companies and give them a ring. the last place I used I wanted 2 large aluminium (12" dia) brake disc bells hard anodizing and a set of 4 M22ish nuts and bolts blasting and plating with zinc and black. I think they charged me about 20 (cash) for the job, it really wasn't expensive and the quality was fine.

You may find someone local to do you a decent job for sensible money.
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Old 9th October 2018, 02:19 PM   #7
scottjoplin is offline scottjoplin  Wales
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Heatsinks work more by convection than radiation so colour isn't such a large issue as surface area, orientation of fins and good air flow
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Old 9th October 2018, 02:21 PM   #8
moray james is offline moray james  Canada
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even with the insulation qualities of paint a painted heat sink will still radiate more heat than the same sink in bare metal. Your most efficient option however is going to be an anodized heat sink.
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Old 9th October 2018, 02:22 PM   #9
JMFahey is offline JMFahey  Argentina
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Black is better any day of the week but paint layer must be thin and matte black, not shiny.

The big thermal resistance barrier is not through the paint layer itself but between solid surface and air.
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Old 9th October 2018, 02:28 PM   #10
Zen Mod is offline Zen Mod  Serbia
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To paint or not to paint - Heatsink Question
thin powdercoated is better than naked Al , any day ....... all day


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