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Old 9th Sep 2017, 7:11 pm   #4
Craig Sawyers
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Join Date: Nov 2010
Location: Oxford, UK.
Posts: 4,941
Default Re: Re-anodising heatsinks?

Black anodising is essentially cosmetic for a heatsink that is not running stinking hot.

The majority of heat transport from a heatsink is via convection, not radiation, for typical heat rise of say 40C. In that case the difference between a black anodised heatsink and a shiny aluminium one is negligible that for typical heat rise.

Rather than pay for a small quantity to be stripped to bare metal and re-anodised, I'd be tempted to spray paint them black.
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