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"Anodizing of zinc"



 

Q. What prevents the anodizing of zinc in a process normally used for anodizing aluminum? I am aware of the "zinc anodizing" process (misnomer) but am looking for a "true" oxide coating on zinc alloy parts (Zamak 3 and/or ZA-8).

Thanks.

Brian Brandel
- Mequon, Wisconsin
^


 

A. Aluminum anodizing processes don't work because the voltage must be much, much higher to anodize zinc. Further, I doubt that sulfuric acid attacks zinc in the same way it attacks aluminum, creating the pinhole porosity characteristic of anodized aluminum. Why do you call it a misnomer--educate me please. Thanks.

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


 

Q. It is a misnomer because with what is described as "zinc anodizing" a layer of oxides, phosphates, and chromates combined, not a simple oxide layer as in aluminum anodizing. In addition, zinc anodizing uses AC current, not DC; therefore, there is no anode and cathode present.

Brian Brandel [returning]
- Mequon, Wisconsin
^


 

A. Anodizing of Zinc was a process offered by Allied-Kelite but not carried over into the acquisition by Macdermid. The process worked in the lab but never gained commercial acceptance because the equipment set up was prohibitively expensive. If you desire I'll try to dig out some of the old papers and copy for you. However, again, it ain't practical.

robert probert
Robert H Probert
Robert H Probert Technical Services
supporting advertiser
Garner, North Carolina
probertbanner
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December 26, 2011

thumbs up signYes, please it would be great to get some literature on the process.
Thanks a lot!

Irwin Sproule
- Ottawa, Ontario, Canada
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December 26, 2011

A. Hi, Irwin.

Fred Pearlstein wrote a good article about it for Products Finishng magazine many years ago. I think it was entitled "Anodizing of 'Other' Metals". Anodized zinc offers fabulous corrosion resistance, but the voltages are much too high to safely use in the "open bus bar" fashion of most plating shops.

I believe that Frank Goodwin of ILZRO can give you some more current information on the process. Good luck.

Regards,

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


September 25, 2014

Q. Need to know what coating / finish can be used on ZAMAK to make it less conductive?
Need to replace an Anodized Aluminium with ZAMAK with similar electrical conductivity resistance that Anodizing offers.

Francis Saju
Mechanical Engineer - Bangalore, INDIA
^


October 2014

A. Hi Francis. As Robert Probert notes, zinc anodizing has proved to usually be impractical. How about a UV-cured hard coating as used on auto headlights and such?

Regards,

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

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