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Sol-gel hybrid films based on organosilane and montmorillonite for corrosion inhibition of AA2024
Dalmoro, V.; Dos Santos, J.H.Z.; Armelín Diggroc, Elaine Aparecida; Alemán Llansó, Carlos; Azambuja, Denise S.
Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. IMEM - Innovació, Modelització i Enginyeria en (BIO) Materials
The present work reports the production of films on AA2024-T3 composed of vinyltrimethoxysilane (VTMS)/tetraethylorthosilicate (TEOS) with incorporation of montmorillonite (sodium montmorillonite and montmorillonite modified with quaternary ammonium salt, abbreviated Na and 30B, respectively), generated by the sal-gel process. According to FT-IR analyses the incorporation of montmorillonite does not affect silica network. Electrochemical characterization was performed by electrochemical impedance spectroscopy measurement in 0.05 mol L-1 NaCl solution. Results indicate that montmorillonite incorporation improves the corrosion protection compared to the non-modified system. Scanning electron microscopy micrographs reveal that high concentrations of montmorillonite provide agglomerations on the metallic surface, which is in detriment of the anticorrosive performance. The VTMS/TEOS/30B films with the lowest concentration (22 mg L-1) of embedded clay provide the highest corrosion protection. (C) 2014 Elsevier Inc. All rights reserved.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria química
Aluminum alloys
Protective coatings
Aluminum
Corrosion
Hybrid coating
Montmorillonite
Sol-gel
ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY
WATER-BARRIER PROPERTIES
ALUMINUM-ALLOY
CLAY NANOPARTICLES
SILANE FILMS
SILICA
PROTECTION
COATINGS
2024-T3
NANOCOMPOSITES
Alumini -- Aliatges
Revestiments protectors
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
info:eu-repo/semantics/publishedVersion
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