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Molecules 2018, 23(5), 1135; https://doi.org/10.3390/molecules23051135

Innovative Formulation Combining Al, Zr and Si Precursors to Obtain Anticorrosion Hybrid Sol-Gel Coating

1
CIRIMAT, Université de Toulouse, CNRS INPT UPS, UMR 5085, 118 Route de Narbonne, 31062 Toulouse CEDEX 09, France
2
Amphenol Socapex, 948 Promenade de l’Arve–BP 29, 74300 Thyez, France
*
Author to whom correspondence should be addressed.
Academic Editors: Ahmad Mehdi and Sébastien Clément
Received: 25 April 2018 / Revised: 4 May 2018 / Accepted: 6 May 2018 / Published: 10 May 2018
(This article belongs to the Special Issue Sol-Gel Chemistry. From Molecule to Functional Materials)
Full-Text   |   PDF [3595 KB, uploaded 10 May 2018]   |  

Abstract

The aim of our study is to improve the aluminium alloy corrosion resistance with Organic-Inorganic Hybrid (OIH) sol-gel coating. Coatings are obtained from unusual formulation with precursors mixing: glycidoxypropyltrimethoxysilane (GPTMS), zirconium (IV) propoxide (TPOZ) and aluminium tri-sec-butoxide (ASB). This formulation was characterized and compared with sol formulations GPTMS/TPOZ and GPTMS/ASB. In each formulation, a corrosion inhibitor, cerium (III) nitrate hexahydrate, is employed to improve the corrosion performance. Coatings obtained from sol based on GPTMS/TPOZ/ASB have good anti-corrosion performances with Natural Salt Spray (NSS) resistance of 500 h for a thickness lower than 4 µm. Contact angle measurement showed a coating hydrophobic behaviour. To understand these performances, nuclear magnetic resonance (NMR) analyses were performed, results make sol-gel coating condensation evident and are in very good agreement with previous results. View Full-Text
Keywords: aluminium alloy 6061; sol-gel process; hybrid coating; corrosion resistance aluminium alloy 6061; sol-gel process; hybrid coating; corrosion resistance
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Genet, C.; Menu, M.-J.; Gavard, O.; Ansart, F.; Gressier, M.; Montpellaz, R. Innovative Formulation Combining Al, Zr and Si Precursors to Obtain Anticorrosion Hybrid Sol-Gel Coating. Molecules 2018, 23, 1135.

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