Interactive Resource icon  AC-Electrograining

 
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Resource type: Interactive Resource
Description: This interactive animation presents AC-electrograining process used for roughening aluminium. For AC-electrograining, during the anodic charge cycle, the pits, initiated by the graining solution anions, Cl- or NO3-, grow due to aluminium oxidation. During the subsequent cathodic charge cycle, all the current is drawn to the local pits, hence heterogeneously distributed, and consequently very high local cathodic current densities are present. This leads to mass transfer control over the cathodic hydrogen gas evolution reaction, which results in an increase of the local pH at the pit sites.
Keywords: charge cycle • pH • current density • roughening
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: 03 December 2003
Date added: 21 December 2009
Package:
Resource ID: 2608