Interactive Resource icon  Electrolytic Capacitor Foil - Anodising

 
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Resource type: Interactive Resource
Description: This interactive animation shows how via barrier film anodising a compact featureless oxide film is formed on aluminium. The aluminium is employed as anode in an electrolytic cell containing a near neutral solution of for example ammonium pentaborate, ammonium tartrate or other. The oxide film is grown via ingress of oxygen carrying species from the electrolyte and oxidised aluminium from the anode by applying an anodic current or potential across the electrochemical cell. The forming voltage determines the layer thickness; a ratio of 1.2-1.4 nm V-1 is generally valid.
Keywords: oxide film • electrolytic cell
Categories: Materials > Metals & alloys > Aluminium & alloys
Processes > Surface treatments
Properties > Electrical, magnetic & optical > Optical
Created by: MATTER, The University of Liverpool
Iris De Graeve, Vrije Universiteit Brussel (VUB)
Herman Terryn, Vrije Universiteit Brussel (VUB)
Contributions: Marc Ryckeboer, Sapa
Christophe Sigli, Alcan Centre de Recherches de Voreppe
Hugh Shercliff, University of Cambridge
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: 07 May 2004
Date added: 21 December 2009
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Resource ID: 2606