Curated with aloha by
Ted Mooney, P.E. RET
The authoritative public forum
for Metal Finishing 1989-2025
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Excess dye on surface of anodized parts
Q. I have machined parts made from 7075-T651 aluminum coming back from my local anodizer after Type II Class II anodizing with excess dye on all surfaces of the parts. The excess dye can be wiped away with a microfiber cloth wetted with vinegar (4% acetic acid) and once the excess dye is wiped away the anodized layer underneath looks pristine and has no visible changes to its color or finish. Excess dye is seen with all dye colors except the gold which I believe is a FAO based dye. Anodizer uses a mid temperature nickel free seal.
Any recommendations for process changes to prevent the excess dye or post anodizing cleaning solutions to wash away the excess dye are welcome.
- Calgary Alberta Canada
April 26, 2025
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