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topic 35882

Specs for Black Anodizing of 6061-T6 Aluminum

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We require a Black Hardtuf X20 Anodize finish per Mil-A-63576 [link by ed. to spec at TechStreet] A (or equivalent) on some of our parts. Can you tell me if Mil-A-8625 [link is to free spec at Defense Logistics Agency,]F is equivalent to this finish?

Nelson Conchinha
medical device manufacturer - New Bedford, Massachusetts


First of two simultaneous responses -- 2005

Black Hardtuf X20 is a proprietary process that would take place AFTER the parts are Hard Anodized.

The specification 63576 is a teflon/anodize coating spec.
I would venture to say that any good anodizer should have a copy of this standard.

The "Hardtuf x20" on the other hand may be difficult to locate.

Bill Grayson
metal finishing - San Jose, California

Second of two simultaneous responses -- 2005

MIL-A-63576A specifies a hardcoat per MIL-A-8625 (Type III, Class 1) *Emphasis on Type and Class* with an additional PTFE post treatment. So no, they are not equivalent. Companies who supply coatings to this specification, using a variety of trade names, use different techniques and methods to apply the PTFE post treatments. So Luke Engineering's product, Lukon 24, and others may not be exactly equivalent either.

Chris Jurey, Past-President IHAA
Luke Engineering & Mfg. Co. Inc.
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International Hard Anodizing Association - Wadsworth, Ohio

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