Effect of cerium on structure modifications of a hybrid sol-gel coating, its mechanical properties and anti-corrosion behavior
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Data
2012-11-01
Autores
Cambon, Jean-Baptiste
Esteban, Julien
Ansart, Florence
Bonino, Jean-Pierre
Turq, Viviane
Santagneli, S. H. [UNESP]
Santilli, Celso Valentim [UNESP]
Pulcinelli, Sandra Helena [UNESP]
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Editor
Pergamon-Elsevier B.V. Ltd
Resumo
An organic-inorganic hybrid coating was developed to improve the corrosion resistance of the aluminum alloy AA 2024-T3. Organic and inorganic coatings derived from glycidoxypropyltrimethoxysilane (GPTMS) and aluminum tri-sec-butoxide Al((OBu)-Bu-s)(3), with different cerium contents, were deposited onto aluminum by dip-coating process. Corrosion resistance and mechanical properties were investigated by electrochemical impedance measurements and nano-indentation respectively. An optimal cerium concentration of 0.01 M was evidenced. To correlate and explain the hybrid coating performances in relation to the cerium content, NMR experiments were performed. It has been shown that when the cerium concentration in the hybrid is higher than 0.01 M there are important modifications in the hybrid structure that account for the mechanical properties and anti-corrosion behavior of the sol-gel coating. (C) 2012 Elsevier Ltd. All rights reserved.
Descrição
Palavras-chave
Hydrides, Sol-gel chemistry, Nuclear magnetic resonance (NMR), Impedance spectroscopy, Electrochemical properties, Mechanical properties
Como citar
Materials Research Bulletin. Oxford: Pergamon-Elsevier B.V. Ltd, v. 47, n. 11, p. 3170-3176, 2012.