Join Date: May 2006
Location: Left Coast USA
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The least noble metal will be sacrificed first, but adding a more noble metal (an aditional zinc) will increase the decay of the least noble. It that makes sense. So if you use both you will just decay the magnesium anode faster, but then the zinc would start protecting when the magnesium is gone.
At least that is the way I see it.
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Currently in Long Beach, CA