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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 10th October 2018, 03:41 PM   #21
Eric is offline Eric  United States
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To paint or not to paint - Heatsink Question
I am going to experiment with this shortly - I have a few sinks that are natural aluminum and some of the same profile that are painted black vs brown.

I am planning to use an upcoming MoFo build (most simple- single sink, single transistor to mount) to compare various types of mounting interfaces (various silpads, mica&goop, Keratherm, Aluminum oxide ceramic, etc).

This will also give an opportunity to explore paint color vs raw aluminum. Still waiting on a few parts to arrive in the mail, but this should provide some interesting data.
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Old 11th October 2018, 01:44 AM   #22
JMFahey is online now JMFahey  Argentina
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You sure they are *painted*?

Id guess they are anodized intead.

Which on aluminum is cheaper/faster/better/more uniform.
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Old 11th October 2018, 01:51 AM   #23
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Color of the paint on anodized aluminum does NOT matter.
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Old 11th October 2018, 01:56 AM   #24
metalman is offline metalman  Canada
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Color of anodizing does matter as the emissivity varies with color. Similar variation in emissivity also occurs with paint colors.
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Old 11th October 2018, 07:47 AM   #25
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by alexberg View Post
Color of the paint on anodized aluminum does NOT matter.
Is that a philosophical point you are making?
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Old 11th October 2018, 07:58 AM   #26
KatieandDad is offline KatieandDad  United Kingdom
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They are definitely painted.
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Old 11th October 2018, 08:01 AM   #27
avtech23 is offline avtech23  Australia
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To paint or not to paint - Heatsink Question
Quote:
Originally Posted by vdi_nenna View Post
How to anodize without battery acid.
Acid vs non-acid process results look the same in photo.

Anodizing and dyeing aluminum without battery acid... - Observations


Thanks for that link. Very useful!
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Old 11th October 2018, 09:32 AM   #28
rookakoma is offline rookakoma  Hungary
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Quote:
Originally Posted by metalman View Post
Color of anodizing does matter as the emissivity varies with color. Similar variation in emissivity also occurs with paint colors.
The emissivity of clear anodized is 0.76 to 0.84, close to black (0.82-0.86)
and the plain is just 0.04?
Is that correct?
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Old 11th October 2018, 10:16 AM   #29
KatieandDad is offline KatieandDad  United Kingdom
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I've done some phoning around. I'd have to paint strip the sinks first. Then it would cost about 80 to have them anodized in black.

I might consider it as it apart at the moment with failed PSU caps.
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Old 11th October 2018, 02:10 PM   #30
alexberg is offline alexberg
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Quote:
Originally Posted by scottjoplin View Post
Is that a philosophical point you are making?
Who knows. Not cheery picking for sure.
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