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The effect of superhydrophobic wetting state on corrosion protection: The AKD example
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Polymer och fiber. KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
Lund University, Sweden.
KTH Royal Institute of Technology, Sweden.
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2013 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 412, p. 56-64Article in journal (Refereed) Published
Abstract [en]

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 1010Ωcm2 (at 10-2Hz) 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.

Place, publisher, year, edition, pages
2013. Vol. 412, p. 56-64
Keywords [en]
Alkyl ketene dimer (AKD), Corrosion protection, Superhydrophobic coating, Wetting state
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-6584DOI: 10.1016/j.jcis.2013.09.006Scopus ID: 2-s2.0-84885028398Local ID: 23881OAI: oai:DiVA.org:ri-6584DiVA, id: diva2:964423
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2020-12-01Bibliographically approved

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Polymer och fiberSP Kemi Material och YtorSP – Sveriges Tekniska Forskningsinstitut
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