Interactive Resource icon  Cathodic Protection Methods

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Description: Cathodic protection can be applied if the metal to be protected is coupled to the negative pole of a direct current source, while the positive pole is coupled to an auxiliary anode. Since the driving voltage is provided by the DC source there is no need for the anode to be more active than the structure to be protected. In fact, it is possible to use anodes which can remain inert/non-consumable during impressed cathodic protection. This type of anode supports other anodic reactions on their surfaces. In environments where water and chloride ions are present, chlorine evolution and oxidation of water are possible. It is also possible to use semi-consumable anodes such as graphite and high silicon iron or consumable anodes such as scrap iron, for example. This animation illustrates how cathodic protections can be provided by: sacrificial anodes, impressed current and cladding process (courtesy of Corrosion Doctors at
Keywords: cathodic protection • sacrificial anodes • impressed current • cladding
Categories: Science approaches > Corrosion & degradation
Science approaches > Corrosion & degradation > Corrosion protection
Materials > Metals & alloys > Aluminium & alloys
Created by: MATTER, The University of Liverpool
Steven Meijers, Corus
Carlos Caicedo-Martinez, Corus
Contributions: Andreas Blistein, Alcan
Herman Terryn, Vrije Universiteit Brussel (VUB)
Iris De Graeve, Vrije Universiteit Brussel (VUB)
Marc Ryckeboer, Sapa
Published by: European Aluminium Association, Brussels
License: This resource is released under the Creative Commons Attribution Non-Commercial No Derivatives license (2.0 UK: England & Wales).
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Date created: 10 October 2005
Date added: 07 July 2010
Resource ID: 2879