Curated with aloha by
Ted Mooney, P.E. RET
The authoritative public forum
for Metal Finishing 1989-2025
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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 [on DLA] Type I. Any help.
Frank Grabowski- danbury Connecticut USA
2000
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
Los Angeles California USA
2000
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,
anodising shop - Auckland, New Zealand
2000
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