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sacrificial anode

American  

noun

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

sacrificial anode British  

noun

  1. 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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of sacrificial anode

First recorded in 1975–80

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Which of these metals could be used as a sacrificial anode in the cathodic protection of an underground steel storage tank?

From Textbooks • Feb. 14, 2019

Reactivity like this means the sacrificial anode would be depleted rapidly and need to be replaced frequently.

From Textbooks • Feb. 14, 2019

Don�t ignore a scratch and unwittingly let your aluminum outboard motor become a sacrificial anode.

From Time Magazine Archive

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.