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    Methyl-modified hybrid organic-inorganic coatings for the conservation of copper

    Year: 2014

    Journal: JOURNAL OF CULTURAL HERITAGE, Vol. 15, p 242-249, 20150722

    Authors: Kiele, Erika; Lukseniene, Janina; Griguceviciene, Asta; Selskis, Algirdas; Senvaitiene, Jurate; Ramanauskas, Rimantas; Raudonis, Rimantas; Kareiva, Aivaras

    Organizations: Vilnius State Univ, Fac Chem, Dept Inorgan Chem, LT-03225 Vilnius, Lithuania; Lithuanian Art Museum, Pranas Gudynas Ctr Restorat, LT-01135 Vilnius, Lithuania; Inst Chem, Ctr Phys Sci & Technol, LT-01108 Vilnius, Lithuania

    A simple sol-gel technique for the preparation of methyl-modified silica coatings for the protection of the external surface of copper has been used in this study. Tetraethylorthosilicate (TEOS) has been used as a precursor to prepare nanosilica coatings on the surface of copper. The methyl-modified silica sols were obtained by mixing of 3% SiO2 sol solution with trimethylchlorosilane (TMCS) or hexamethyldisilozane( HMDS) as basic materials. For comparison, the copper substrates were also coated with commercial polymers (Paraloid B 72, Plexisol P 550-40 and polyvinyl butyral (PVB)). The surface morphology changes of uncoated and coated specimens were investigated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The hydrophobicity of surfaces and photochemical ageing effects were evaluated by contact angle measurements. Potentiodynamic measurements were obtained in order to compare corrosion parameters of the coatings. (C) 2013 Elsevier Masson SAS. All rights reserved.