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Issue 129, 2015
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On the structure of high performance anticorrosive PMMA–siloxane–silica hybrid coatings

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Abstract

Environmentally compliant organic–inorganic hybrid coatings for efficient corrosion protection of metallic surfaces are potential alternatives to the current method based on chromate passivation. In this context PMMA–siloxane–silica (PMMA–SS) hybrid films were prepared using the sol–gel process from the radical copolymerization of methyl methacrylate and 3-(trimethoxysilyl)propyl methacrylate followed by acidic hydrolysis and polycondensation of tetraethoxysilane (TEOS), under variation of the ethanol to H2O ratio (0.0–1.0). The structural properties of about 2 μm thick coatings, deposited by dip-coating onto carbon steel, were related with their corrosion protection efficiency. The correlation of data obtained by X-ray photoelectron spectroscopy, nuclear magnetic resonance and small angle X-ray scattering has shown for intermediate ethanol to H2O ratios the highest connectivity (∼83%) of the inorganic phase, bonded covalently to organic moieties, yielding a dense and homogeneous nanocomposite structure with high thermal stability, very good adhesion to the metallic substrate and excellent barrier properties. The electrochemical impedance spectroscopy measurements have shown for coatings prepared at intermediate EtOH/H2O ratios a high corrosion resistance of almost 10 GΩ cm2, which remained unchanged for more than 6 months in contact with 3.5% NaCl solution and more than 3 months exposed to an acidic NaCl environment.

Graphical abstract: On the structure of high performance anticorrosive PMMA–siloxane–silica hybrid coatings

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Supplementary files

Article information


Submitted
09 Oct 2015
Accepted
04 Dec 2015
First published
07 Dec 2015

RSC Adv., 2015,5, 106754-106763
Article type
Paper
Author version available

On the structure of high performance anticorrosive PMMA–siloxane–silica hybrid coatings

F. C. dos Santos, S. V. Harb, M. Menu, V. Turq, S. H. Pulcinelli, C. V. Santilli and P. Hammer, RSC Adv., 2015, 5, 106754
DOI: 10.1039/C5RA20885H

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