Black Anodize Color Specification per MIL Spec

K

Kamranabbasian

#1
Is there any visual specification for black anodizing color? I heard there are coupons to use as a reference. Is that right? is that comply to Mil-A-8625, Type II, Class 2 requirements? some of black anodizing parts turn to kind of blue. I am wondering is there any standard to specify how off of black could be the color. I went through Mil-A-8625 and QPL-81706 but i couldn't find any thing to address my question.
 
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Mike S.

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#2
The color change is often due to UV light or heat. Castings will often absorb the die differently from place to place.

There is a light fastness test in the standard (section 4.5.4) -- I'd read those ASTM standards referenced and see if there is any help there.

If you are working with an anodizer, they should be able to help you come to an agreement on how to specify the color fastness. Finding a good anodizer is not easy.
 
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