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What aluminum finish provides salt water protection and wind abrasion resistance up to170C?

I would like to create an air-cooled heat sink for an electronic component for a salt water atmosphere. I expect the maximum temperature of the air cooled fin stock to reach 170C a localized area, worst case. The finish must withstand forced air cooling in a salt water atmosphere. I read in the answer to another question that anodizing is durable, but cracks above 100C, reducing thermal conductivity. Iriditing is not very durable. Are there any suitable aluminum finishes for this application?

Glenn Eksaa
Customer - Easton, Pennsylvania, USA
January 21, 2008

Anodizing is a common finish for heat sinks. Although it's true that it's coefficient of expansion is lower than that of aluminum, anodized and hard anodized cookware has been in service for decades.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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January 21, 2008

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