Autor(en)
Dalmoro, V; dos Santos, J. H. Z; Armelin, E; Aleman, C; Azambuja, D. S
Titel
Sol-gel hybrid films based on organosilane and montmorillonite for corrosion inhibition of AA2024
Teil von
  • Journal of colloid and interface science, 2014-07-15, Vol.426 (426), p.308-313
Ort / Verlag
SAN DIEGO: ACADEMIC PRESS INC ELSEVIER SCIENCE
Links zum Volltext
Quelle
TEMA - Technik und Management
Beschreibungen
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.

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