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"Want to know how to do two-color anodizing"

April 27, 2010

Q. Dear Sirs,

We are the largest and oldest factory for motorcycle alloy rims. Now some customers need double color anodised rims. Although, we have the in-house anodising workshop, we do not know how to do two color anodising.

If any expert can help, we will appreciate it very much.

Best regards

Drill Zhang
plating shop employee - Shanghai, China

"Surface Treatment & Finishing of Aluminium and Its Alloys"
Wernick, Pinner & Sheasby
from Abe Books

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April 29, 2010

A. Assuming that you are using dye for color, dye the whole part with the lightest color, seal it and then mask off the portion that you need to keep that color. Then give the part a quick dip in a dilute nitric acid tank to break the seal, rinse and dye with the darker color. Rinse very well and then seal. You could try not sealing the part after the first dye and before the masking, but that may depend on what maskant you use is.
If the shape of the part is amenable, you might be able to dye the lighter color, use a mechanical mask/shield and spray dye the darker color. This can be a pain because of the temperature required.

James Watts
- Navarre, Florida

July 11, 2012 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. Hi, I'm Nisa from Malaysia. I just want to ask you do you have any idea to do single anodizing with two colors? Should I go for masking? Does masking will give good effect to the second color?

Khairunnisa Abd Ghani
- Kota Kinabalu, Malaysia

July 11, 2012

A. Hi Nisa. As you see, we appended your inquiry to a thread which already answers it. If you have further questions, get back to us.

Good luck.


Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

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