Authors: Durán, A.; Castro, Y.; Aparicio, M.; Conde, A.; de Damborenea, J. J.

Source: International Materials Reviews, Volume 52, Number 3, May 2007 , pp. 175-192(18)

Publisher: Maney Publishing

Abstract:

The preparation and properties of protective sol–gel coatings on metallic substrates are reviewed. Control of the coating microstructure is critical to obtain the desired properties and this requires optimisation of processing parameters that include sol composition, synthesis and processing conditions, deposition method and post-deposition sintering or curing. Current knowledge in these areas, e.g. structure–property–processing relationships, and the characterisation of the coatings produced are discussed. SiO₂ layers have been found to confer good oxidation resistance, but for electrochemical corrosion resistance, mixed oxide layers or hybrid organic–inorganic layers are required. Incorporation of alkylalkoxides with polymerisable groups attached has allowed synthesis of hybrid nanostructured coatings consisting of interpenetrating, chemically bonded organic and inorganic networks. Doping of hybrid sol–gel coatings with environmentally friendly inhibitors is also a promising approach combining barrier properties with active inhibition of corrosion. The potential to control functional properties such as biocompatibility is also briefly considered. It is concluded that both fundamental work on new coating compositions and the development of improved industrial technologies are priorities for future research.

Keywords: CORROSION; PROTECTION; COATING; SOL-GEL; METAL

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174328007X160263

Publication date: 2007-05-01

More about this publication?

• The archive of International Materials Reviews has three previous titles. The full archive is available online, and each title has a separate page of volumes. Please see Metallurgical Reviews , for volumes 1-16, International Metallurgical Reviews for volumes 17-20 and International Metals Reviews for volumes 21-31

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