Interactive Resource icon  Intergranular Corrosion: Anodic and Cathodic Precipitates

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Description: Intergranular or intercrystalline corrosion (IGC) is the preferential attack of the grain boundaries or closely adjacent regions without appreciable attack of the grains themselves. This type of attack is caused by difference in the corrosion potential between the grain boundary-region and the adjacent grain bodies. This type of corrosion is frequently found in 2xxx, 5xxx, 7xxx and in lower degree in 6xxx series. IGC can be caused by preferential precipitation of fine intermetallics at grain boundaries. If such precipitates are closely spaced forming a semi-continuous network along grain boundaries, they lead to IGC. This animation shows schematically the intergranular corrosion on anodic or cathodic intermetallic precipitates.
Keywords: intergranular corrosion • corrosion potential • grain boundaries • precipitates • intermetallics
Categories: Science approaches > Structure, bonding & defects > Grain boundaries
Science approaches > Corrosion & degradation
Science approaches > Corrosion & degradation > Forms of corrosion
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: 12 May 2005
Date added: 07 July 2010
Resource ID: 2871