[s-cars] Thermal properties of anodizing Aluminum

[Trevor Frank]

Improve tc I don't know of anything you could coat it with, but krytox
has a really nice ultra flat black paint that I remember seeing some
numbers that showed an improvement on emissivity that where fairly
impressive.  I also know that Nasa has a special anodized coating that
is very flat.  I have designed a system in the past that was very
sensitive to IR.  I first had the part sand blasted then anodized to
"flatten" it and improve the emissiveness.  Honestly I never saw an
improvement but it did look cool.

-----Original Message-----
From: mlp qwest [mailto:mlped at qwest.net]
Sent: Wednesday, February 12, 2003 10:11 AM
To: s-car-list at audifans.com
Subject: [s-cars] Thermal properties of anodizing Aluminum


Anyone on the list have any particular knowledge or expertise on the
thermal effects of anodizing aluminum?

I gather there are at least three (3) major types or subcategories
anodizing, sometimes described or referred to as:

1.	Type 1 - "Chromic Acid" ~> usually leaves very thin deposit

2.	Type 2 - "Sulfuric Acid" ~>  ditto

3.	Type III aka "Hard Coating" ~> a much thicker process, which can
be done
in a way to add  very different characteristics to aluminum.  Type III
anodizing can, and is used to significantly inhibit aluminums otherwise
high thermal heat exchange capabilities, as for example in coating
aluminum pistons to reject heat etc.

Anyone know how processes 1 or 2 affect aluminums heat transfer
capabilities? ' I'd like to know what, if any kinds of anodizing are
done to ENHANCE heat transfer either by conductivity, or for convection
transfer purposes.

Thanks
Mikee "Wondering if there could be a Purple Anodized Radiator in some
one's future" P.


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