Interactive Resource icon  Corrosion Prevention: Anodisation

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Description: Anodising is an electrolytic process, in which aluminium is oxidised by applying an external, electrical driving force, to form a inert aluminium oxide film on the surface. In acid electrolytes, such as sulphuric acid, phosphoric acid or chromic acid, regular structured, porous oxide layers are formed. The film thickness can be tuned via the electrical anodising current/potential and time applied, but is limited by the dissolving power (acid type, concentration and temperature) of the anodising solution used; the thickness can thus range between a few nm to 50-100 μm. The animation schematically illustrates this mechanism, and shows how porous anodic film is formed, giving aluminium excellent protection against corrosion, especially after sealing the pores.
Keywords: anodising • porosity • anodic film • electrolyte
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: 28 January 2005
Date added: 07 July 2010
Resource ID: 2876