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sacrificial anode

Chemistry. an anode that is attached to a metal object subject to electrolysis and is decomposed instead of the object.
Origin of sacrificial anode
1975-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for sacrificial anode
  • Water heaters come with internal sacrificial anode rods to protect against rusting.
  • 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 system.
  • The required cathodic protection current is supplied by sacrificial anode materials or by an impressed current system.
  • The zinc in this case is called a sacrificial anode, and the steel will be protected as long as any zinc remains.
British Dictionary definitions for sacrificial anode

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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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