sacrificial anode

 Use in a sentence

sacrificial anode

noun
Chemistry. an anode that is attached to a metal object subject to electrolysis and is decomposed instead of the object.
Origin:
1975–80

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
sacrificial anode
 
—n
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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00:10
Sacrificial anode is always a great word to know.
So is scrub. Does it mean:
any of a class of chemical compounds having the general formula ROH, where R represents an alkyl group and ?OH a hydroxyl group
to remove impurities from a gas by chemical means, as sulfur dioxide from smokestack gas or carbon dioxide from exhaled air in life-support packs
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Example sentences
For sacrificial anode systems, periodic underwater inspections shall be
  performed and observations recorded.
The required cathodic protection current is supplied by sacrificial anode
  materials or by an impressed current system.
Ensure that the pump is properly grounded and bonded to reduce the chance of it
  becoming a sacrificial anode.
Cathodic protection of the piping shall be provided by a sacrificial anode
  system.
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