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Unread 04-15-2001, 10:35 PM   #5
jimsnyder
Cooling Neophyte
 
Join Date: Mar 2001
Location: Columbus, OH
Posts: 23
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It is not so much the purity of the metals, but the oxidation/reduction potential of the metal itself. Zinc is more easily oxidized than most other metals, so you find zinc-coated chain link fences, etc. Zinc becomes the "sacrificial metal" for oxidation, preventing oxidation of the coated metal until the zinc is mostly oxidized. (Chemist!)
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