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Issue 6, 2014
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Self-healing mechanisms of water triggered smart coating in seawater

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Abstract

Scratched alkyd varnish coating (AVC), with isophorone diisocyanate (IPDI) microcapsules as functional additives, display self-healing properties. Here we investigated the mechanism of the self-healing process using a water trigger in seawater. Electrochemical impedance spectroscopy was used to monitor the self-healing efficiency. A detailed examination of the penetration of seawater into the crevice, the self-healing process along the crevice, the self-healing process of seawater penetrating into the coating and failure process of the coating was carried out. The self-healing time of IPDI-AVC was influenced by different metal substrates and self-healing could be inhibited by active metals such as Q235 steel. Due to the formation of a thin metal-oxide layer on the metal surface, other metals, such as 5083 aluminum alloy, titanium and copper, had much less influence on the self-healing time of IPDI-AVC. This study enhances the comprehension of the mechanism of self-healing AVC functionalized by the addition of microcapsules.

Graphical abstract: Self-healing mechanisms of water triggered smart coating in seawater

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Article information


Submitted
27 Aug 2013
Accepted
23 Oct 2013
First published
25 Oct 2013

J. Mater. Chem. A, 2014,2, 1914-1921
Article type
Paper

Self-healing mechanisms of water triggered smart coating in seawater

W. Wang, L. Xu, X. Li, Z. Lin, Y. Yang and E. An, J. Mater. Chem. A, 2014, 2, 1914
DOI: 10.1039/C3TA13389C

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