Interactive Resource icon  Corrosion Prevention: Silane Coating

 
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Description: Silanes as widely used as adhesion promoters and for corrosion protection on metals. Silanes are hybrid organic-inorganic molecules containing Si-O-CnH2n+ groups which, after hydrolysis into silanol groups -Si-OH, can interact with the metallic substrate to form a complex interface region, containing -Si-O-M bonds (M = metal). Silanes can be used on various metals: Al, Zn, steel, Mg. The formation of strong chemical bonds at the metal/film interface depends however on the initial surface condition of the metal; surface OH groups are required, hence a proper surface cleaning/etching must precede the silane passivation process. After application, curing of the silane film is required to obtain a dense film network, which provides good corrosion barrier properties. The animation shows TEM image of a cross-section of silane passivated aluminium (courtesy of A. Franquet, PhD, Vrije Universiteit Brussel (VUB)).
Keywords: silane • hybrid • organic-inorganic molecules • passivation • curing
Categories: Science approaches > Corrosion & degradation
Science approaches > Corrosion & degradation > Corrosion protection
Materials > Hybrids
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: 05 December 2003
Date added: 07 July 2010
Package:
Resource ID: 2878