Interactive Resource icon  Pitting and Intergranular Corrosion

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Description: Very small second phases precipitates appear to be harmless. However if they are in located preferentially at grain boundaries they may be able to promote intergranular corrosion. Particularly, if small precipitates are closely spaced so that they can form a semi-continuous network along grain boundaries. This animation is a virtual experiment in which two aluminium alloys are corroded by adding an acidified NaCl solution. The animation shows differencies between pitting and itergranular corrosion, and formation of a precipitate free zone (PFZ).
Keywords: alloying elements • secondary phase • grain boundaries • pitting corrosion • itergranular corrosion • precipitate free zone
Categories: Science approaches > Structure, bonding & defects > Grain boundaries
Science approaches > Corrosion & degradation
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: 19 January 2005
Date added: 07 July 2010
Resource ID: 2867