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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.

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

From Textbooks • Feb. 14, 2019

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

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.