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Faded Anodized Parts

Over a period of years, (3-5),the black anodizing of housings exposed to the elements fades to a white color. They were anodized to MIL-A-8625 / MIL-PRF-8625 [⇦ this spec on DLA] Type I. Any help.

Frank Grabowski
- danbury Connecticut USA
2000

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Dear Frank,

I would need a little more info, such as alloy and size of the parts. But you might want to try a non fade anodize along the lines of the Aluminum Association Standards & Designations A44.

Thank You,

Chris

Chris Faeth
Los Angeles California USA
2000

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Dear Frank

Fading can cause by a very hash corrosive and/or salty atmospheric conditions. Film thickness and the colouring process are contributing factors. Electrolytic colouring process has superior colour fastness as compared to colouring by dye.

Regards,

Pelimani Fisi'iahi
anodising shop - Auckland, New Zealand
2000

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