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Three-dimensional structure analysis and percolation properties of a barrier marine coating

Chen, B; Guizar-Sicairos, M; Xiong, G; Shemilt, L; Diaz, A; Nutter, J; Burdet, N; ... Robinson, I; + view all (2013) Three-dimensional structure analysis and percolation properties of a barrier marine coating. Scientific Reports , 3 , Article 1177. 10.1038/srep01177. Green open access

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Abstract

Artificially structured coatings are widely employed to minimize materials deterioration and corrosion, the annual direct cost of which is over 3% of the gross domestic product (GDP) for industrial countries. Manufacturing higher performance anticorrosive coatings is one of the most efficient approaches to reduce this loss. However, three-dimensional (3D) structure of coatings, which determines their performance, has not been investigated in detail. Here we present a quantitative nano-scale analysis of the 3D spatial structure of an anticorrosive aluminium epoxy barrier marine coating obtained by serial block-face scanning electron microscopy (SBFSEM) and ptychographic X-ray computed tomography (PXCT). We then use finite element simulations to demonstrate how percolation through this actual 3D structure impedes ion diffusion in the composite materials. We found the aluminium flakes align within 15° of the coating surface in the material, causing the perpendicular diffusion resistance of the coating to be substantially higher than the pure epoxy.

Type: Article
Title: Three-dimensional structure analysis and percolation properties of a barrier marine coating
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/srep01177
Publisher version: http://dx.doi.org/10.1038/srep01177
Language: English
Additional information: This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/.
Keywords: Characterization and analytical techniques, Imaging techniques, Phase-contrast microscopy, Structure of solids and liquids
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1388546
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