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Alternate options for anodization

2003

Hi,

I'm an undergraduate student at the University of Oregon. The lab I'm currently a part of uses anodization quite frequently on various aluminum parts. We use aluminum for both the cathode and anode. This creates a problem because every time we anodize something a substantial part of the cathode disintegrates. As a result, the threads and screws no longer make electrical contact with each other/no longer tightly hold onto the aluminum part to be anodized. We would like to try to use a different material for the cathode or anode, perhaps stainless steel or graphite. Contamination of the bath seems to be an unavoidable and unacceptable side effect when other materials are used. Obviously commercial industries must have found a way to reduce this effect, but I have been unable to find out how they do this. Any ideas?

Thanks,

Sandra Penny
- Eugene, Oregon, USA

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Staying with aluminum cathodes is probably the best answer for your case, but you need the right alloy and construction method.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2003