Metal finishing Q&As since 1989
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Etching of cobalt-chrome alloys, electropolishing
I am looking for any and all information on surface etching of cobalt chrome alloys using an ambient temperature bath.
David B [last name deleted for privacy by Editor]1996
January 3, 2009
Hi, David. We need more info please? :-)
Sorry but it's just not clear whether you wish to etch a cobalt-chrome alloy . . . or whether you are trying to electropolish it but it is getting etched instead of electropolished . . . or what the situation is. It's not clear if you require an ambient temperature bath, or you are telling us that the bath you are using which is causing the etching is ambient temperature.
It's not clear if you are successfully electropolishing a number of other stainless steels but the cobalt-bearing one is causing problems that the nickel-bearing steels are not.
The most common causes of etching are excess water (and at ambient temperature you have no evaporation to deal with the drag-in) and insufficient current density.
The Electroplating Engineering Handbook [on
AbeBooks or
eBay or
Amazon (adv.)]
has a good chapter on electropolishing, and
Metal Coating Process Corporation runs an electropolishing school. Good luck.
Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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