06-20-2010, 08:37 PM
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#11 (permalink)
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Base Member
Join Date: May 2010
Location: SF bay area
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Quote:
Originally Posted by frost
There would really be no reason I can think of to do both anodizing and powder coating. The benefits of anodizing a part (color, scratch resistance, strengthening, and protection from elements, including sunlight, rain, chemicals, etc) are pretty much rendered useless if a powder coating is applied on top of it.
Powder coating will provide all these benefits, with the exception of actually strengthening the aluminum alloy, and you will have more options of colors, and the colors will be more consistent.
Since the aluminum will not be in some sort of high abuse area, I actually think PC will be a better option for your particular application.
But to answer your question, anodize coatings, no matter how thick are still subject to cracking (known as crazing in the biz) under extreme temperatures because of the coefficient of expansion in aluminum (aluminum oxide is hard and brittle, the base metal is soft and malleable). So I would probably pick one or the other.
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The reason I wanted to both anodize and powder coat is to achieve two tone coloring, black and silver, So I was planing on anodizing the whole part hard clear and having the recessed area powder coated black.
I have seen some parts anodized two different colors, but they didn't turn out so well. As far as powder coating in two colors, I'm not sure if that's possible, please advise.
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