cathodic protection

protection of ferrous metals against electrolysis by the attachment of sacrificial anodes.
Also called electrolytic protection.

1930–35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cathodic protection
metallurgy See also sacrificial anode a technique for protecting metal structures, such as steel ships and pipelines, from electrolytic corrosion by making the structure the cathode in a cell, either by applying an electromotive force directly or by putting it into contact with a more electropositive metal

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Another option for upgrading existing tanks is to add both cathodic protection
  and interior lining.
The rectifier is the heart of the cathodic protection system, supplying the
  electric power that makes the system work.
Cathodic protection upgrade shall be performed under the direct supervision and
  instruction of a corrosion expert.
Cathodic protection is a procedure by which an underground metallic pipe is
  protected against corrosion.
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