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"MIL-C-5541 class 3" versus "MIL-a-8625 type III class 2"

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Greetings,

I am engineering student, I am designing a radiator of aluminum and wanted to consult as anticorrosive treatment but is adapted, "MIL-C-5541 Class 3" versus" Mil-A-8625 [link is to spec at TechStreet] Tipe III Class 2 ", and why?.

Thanks,

Lucas Jiménez Moroto
UPM - Madrid, España

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The former spec is chromate conversion coating, which leaves a thin electrically conductive film on the aluminum. The latter spec is hard coat anodizing, which is a very heavy, electrically insultating, wear resistant finish. I don't know if the former will meet your needs but I'm pretty sure the latter won't. You need to obtain the specs and read them, Lucas. They should be available free from http://assist.daps.dla.mil.

Ted Mooney, P.E.
finishing.com
Brick, New Jersey

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