sacrificial anode

Chemistry. an anode that is attached to a metal object subject to electrolysis and is decomposed instead of the object.

1975–80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sacrificial anode
metallurgy an electropositive metal, such as zinc, that protects a more important electronegative part by corroding when attacked by electrolytic action

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Water heaters come with internal sacrificial anode rods to protect against
Ensure that the pump is properly grounded and bonded to reduce the chance of it
  becoming a sacrificial anode.
For sacrificial anode systems, periodic underwater inspections shall be
  performed and observations recorded.
Cathodic protection of the piping shall be provided by a sacrificial anode
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