Interactive Resource icon  Reactivity of the Oxide Film

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Description: In contact with moisture from the environment or by immersion in boiling water the outer surface of the alumina film becomes hydrated. The oxide film formed in boiling water is expected to be thicker and more protective compared to the film formed in moisture. This animation shows how alumina film further reacts with moisture and boiling water respectively. Click on each diagram to see how the new alumina film is formed in both cases. lImmersion of aluminium in boiling water is called boehmitage (formation of boehmite, Al2O3.H2O(s)) and is used industrially to improve the corrosion properties of aluminium.
Keywords: alumina film • moisture • boiling water • boehmite
Categories: Science approaches > Corrosion & degradation
Materials > Ceramics & glasses > Technical ceramics > Alumina
Materials > Metals & alloys > Aluminium & alloys
Product Forms > Flat > Foil, film & tape
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: 23 March 2005
Date added: 07 July 2010
Resource ID: 2858