Study of the degradation of hybrid sol–gel coatings in aqueous medium
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Other documents of the author: Suay, Julio; Cabedo, Luis; Hernández Escolano, Miriam; Juan Díaz, M.; Martínez Ibáñez, M.; Izquierdo Escrig, Raul; GURRUCHAGA, MARILO; Goñi, Isabel
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comunitat-uji-handle2:10234/7034
comunitat-uji-handle3:10234/8619
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http://dx.doi.org/10.1016/j.porgcoat.2014.06.004 |
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Title
Study of the degradation of hybrid sol–gel coatings in aqueous mediumAuthor (s)
Date
2014-11Publisher
ElsevierISSN
0300-9440Bibliographic citation
JUAN-DÍAZ, M. J., et al. Study of the degradation of hybrid sol–gel coatings in aqueous medium. Progress in Organic Coatings, 2014, vol. 77, no 11, p. 1799-1806.Type
info:eu-repo/semantics/articlePublisher version
http://www.sciencedirect.com/science/article/pii/S0300944014002069Abstract
The design and development of suitable multilayered functional coatings for delaying corrosion advance in metals and become controlled-release vehicles requires that the properties of the coatings are known. Coatings ... [+]
The design and development of suitable multilayered functional coatings for delaying corrosion advance in metals and become controlled-release vehicles requires that the properties of the coatings are known. Coatings prepared by the sol–gel method provide a good approach as protective layers on metallic surfaces. This kind of coating can be prepared from pure chemical reagents at room temperature and atmospheric pressure, with compositions in a very wide range of environmentally non-aggressive precursors. Sol–gel coatings based on siloxane bonded units were prepared, starting with an organic–inorganic hybrid system. Synthesis procedures included acid-catalysed hydrolysis, sol preparation, and the subsequent gelation and drying. The alkoxide precursors used were methyl-triethoxysilane (MTMOS) and tetraethyl-orthosilicate (TEOS) in molar ratios of 10:0, 9:1, 8:2 and 7:3. After determination of the optimal synthesis parameters, the materials were characterised by solid 29Si nuclear magnetic resonance (29Si NMR), Fourier transform infrared spectroscopy (FTIR), contact angle measurement and electrochemical impedance spectroscopy (EIS) test. Finally, the materials were assayed by controlling their weight in contact with water, to determine their ability to degrade by hydrolysis. Electrochemical analysis reveals the formation of pores and water uptake during the degradation. The quantity of TEOS is one of the principal parameters that determine the kinetics of degradation. There is a correlation between the degradation process obtained for long periods and the electrochemical parameters obtained by EIS in short times. The study tries to incorporate knowledge that can be used for designing the degradation process of the functional coatings and to control their properties in short times. [-]
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Progress in Organic Coatings (2014) vol. 77, no 11, p. 1799-1806Rights
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info:eu-repo/semantics/restrictedAccess
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