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The effect of superhydrophobic wetting state on corrosion protection - The AKD example

Ejenstam, Lina; Ovaskainen, Louise; Rodriguez Meizoso, Irene LU ; Wagberg, Lars; Pan, Jinshan; Swerin, Agne and Claesson, Per M. (2013) In Journal of Colloid and Interface Science 412. p.56-64
Abstract
Corrosion is of considerable concern whenever metal is used as construction material. In this study we address whether superhydrophobic coatings could be used as part of an environmentally friendly corrosion-protective system, and specific focus is put on how the wetting regime of a superhydrophobic coating affects corrosion inhibition. Superhydrophobic alkyl ketene dimer (AKD) wax coatings were produced, using different methods resulting in hierarchical structures, where the coatings exhibit the same surface chemistry but different wetting regimes. Contact angle measurements, ESEM, confocal Raman microscopy, open circuit potential and electrochemical impedance spectroscopy were used to evaluate the surfaces. Remarkably high impedance... (More)
Corrosion is of considerable concern whenever metal is used as construction material. In this study we address whether superhydrophobic coatings could be used as part of an environmentally friendly corrosion-protective system, and specific focus is put on how the wetting regime of a superhydrophobic coating affects corrosion inhibition. Superhydrophobic alkyl ketene dimer (AKD) wax coatings were produced, using different methods resulting in hierarchical structures, where the coatings exhibit the same surface chemistry but different wetting regimes. Contact angle measurements, ESEM, confocal Raman microscopy, open circuit potential and electrochemical impedance spectroscopy were used to evaluate the surfaces. Remarkably high impedance values of 10(10) Omega cm(2) (at 10(-2) Hz) were reached for the sample showing superhydrophobic lotus-like wetting. Simultaneous open circuit potential measurements suggest that the circuit is broken, most likely due to the formation of a thin air layer at the coating-water interface that inhibits ion transport from the electrolyte to the metal substrate. The remaining samples, showing superhydrophobic wetting in the rose state and hydrophobic Wenzel-like wetting, showed less promising corrosion-protective properties. Due to the absence of air films on these surfaces the coatings were penetrated by the electrolyte, which allowed the corrosion reaction to proceed. (C) 2013 Elsevier Inc. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Superhydrophobic coating, Wetting state, Corrosion protection, Alkyl, ketene timer (AKD)
in
Journal of Colloid and Interface Science
volume
412
pages
56 - 64
publisher
Elsevier
external identifiers
  • wos:000326665700009
  • scopus:84885028398
ISSN
1095-7103
DOI
10.1016/j.jcis.2013.09.006
language
English
LU publication?
yes
id
84961fd0-4511-4dae-bf82-0c87fd1a4acc (old id 4197886)
date added to LUP
2014-01-13 14:13:33
date last changed
2019-02-20 02:18:41
@article{84961fd0-4511-4dae-bf82-0c87fd1a4acc,
  abstract     = {Corrosion is of considerable concern whenever metal is used as construction material. In this study we address whether superhydrophobic coatings could be used as part of an environmentally friendly corrosion-protective system, and specific focus is put on how the wetting regime of a superhydrophobic coating affects corrosion inhibition. Superhydrophobic alkyl ketene dimer (AKD) wax coatings were produced, using different methods resulting in hierarchical structures, where the coatings exhibit the same surface chemistry but different wetting regimes. Contact angle measurements, ESEM, confocal Raman microscopy, open circuit potential and electrochemical impedance spectroscopy were used to evaluate the surfaces. Remarkably high impedance values of 10(10) Omega cm(2) (at 10(-2) Hz) were reached for the sample showing superhydrophobic lotus-like wetting. Simultaneous open circuit potential measurements suggest that the circuit is broken, most likely due to the formation of a thin air layer at the coating-water interface that inhibits ion transport from the electrolyte to the metal substrate. The remaining samples, showing superhydrophobic wetting in the rose state and hydrophobic Wenzel-like wetting, showed less promising corrosion-protective properties. Due to the absence of air films on these surfaces the coatings were penetrated by the electrolyte, which allowed the corrosion reaction to proceed. (C) 2013 Elsevier Inc. All rights reserved.},
  author       = {Ejenstam, Lina and Ovaskainen, Louise and Rodriguez Meizoso, Irene and Wagberg, Lars and Pan, Jinshan and Swerin, Agne and Claesson, Per M.},
  issn         = {1095-7103},
  keyword      = {Superhydrophobic coating,Wetting state,Corrosion protection,Alkyl,ketene timer (AKD)},
  language     = {eng},
  pages        = {56--64},
  publisher    = {Elsevier},
  series       = {Journal of Colloid and Interface Science},
  title        = {The effect of superhydrophobic wetting state on corrosion protection - The AKD example},
  url          = {http://dx.doi.org/10.1016/j.jcis.2013.09.006},
  volume       = {412},
  year         = {2013},
}