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My niece that makes jewelry for a living shared this on facebook. It's quite interesting. There are pictures at the link of what happens over a period of time as the rings are worn.

Copper and silver rings may not be such a good idea.
by binnion on November 23, 2012

"When you join two metals together in a ring beyond your aesthetic creation you also create something that under the right circumstances can destroy all your work. Two metals joined together in the presence of an electrolyte create an electrolytic cell which is in essence a battery. In a ring the electrolyte is provided by the water you constantly expose your hands to through washing, sweat, swimming etc. One of the metals will be more electrically positive or anodic and one will be more electrically negative or cathodic. The the difference between these poles is measured in volts. When exposed to the electrolyte the anode will dissolve and supply ions to the electrolyte. Just like electroplating or electroetching. The higher the voltage the greater the activity and the faster the anode will dissolve."

Pictures and full story can be read at the link:

http://ganoksin.com/blog/binnion/2012/11/23/copper-and-silve...

Art
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Engineers use the same phenomenon to prevent offshore oil production platforms from rusting away. Aluminum anodes are bolted to the steel legs of the platform and they corrode instead of the steel platform.

http://chemwiki.ucdavis.edu/Analytical_Chemistry/Electrochem...

intercst
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"Engineers use the same phenomenon to prevent offshore oil production platforms from rusting away. Aluminum anodes are bolted to the steel legs of the platform and they corrode instead of the steel platform." intercst


So from time to time they have to be replaced? They use divers to go down and bolt new ones on?

I've heard that those oil platforms are great places to fish, that underneath it develops a sort of fish ecosystem and that all kinds of different fish hang out around the rigs? I'd love to go out to one and go fishing. It would be amazing.

Art
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Thx for posting, Art, I always admired those Japanese rings--yikes.

My ring is "white gold," an alloy of gold and either nickel, manganese or palladium--I have no idea which. The ring is nearly 100 years old, has three tiny diamonds, and was my grandmother's wedding ring.
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Yes, the anodes have to be replaced periodically and the fishing is one of the perks of working on a platform.

intercst
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