to limit electrode galvanic effect

I saw this sentence and thena related phrase suggesting the use of a certain type of electrode.... like sacrifice electrode... the what is the correct word for this typeof electrode?
robrodpAsked:
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ECNSSMTCommented:
grounding electrodes??

I remember something about using lengths of zinc based wires along side regular piping so that the zinc would oxidize first saving the regular piping from oxiding due to ground currents.  It was weird bit of fact stuck in my mind, and what's weirder yet is someone else is asking... (LOL)

Regards,
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ECNSSMTCommented:
thanks for the points.  you've just made my night... LOL

regards,
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