Over the oih solgel process shows high potential for

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over, the OIH sol–gel process shows high potential for the production of multilayer coating systems which are promising environmentally friendly candidates for replacement of the chromate-based pretreatments due to a synergistic effect of good barrier properties and effective ‘‘self-healing’’ action. Acknowledgments The authors would like to gratefully acknowledge the financial support from Fundac ¸a ˜o para a Cie ˆncia e Tecnologia (FCT) for the PhD grant SFRH/BD/62601/2009, the financial support by Centro de Quı´mica [project F-COMP-01-01024- FEDER-022716 (ref. Pest-C/Qui/UI0686/2011)-FEDER- COMPETE] and EU COST action MP1202: HINT - Rational design of hybrid organic-inorganic interfaces: the next step towards functional materials. References 1. Osborne, JH, ‘‘Observations on Chromate Conversion Coatings from a Sol–Gel Perspective.’’ Prog. Org. Coat. , 41 280–286 (2001) 2. Guo, K, ‘‘A Review of Magnesium/Magnesium Alloys Corrosion and Its Protection.’’ Recent Pat. Corros. Sci. , 2 13–21 (2010) 3. Guglielmi, M, ‘‘Sol–Gel Coatings on Metals.’’ J. Sol Gel Sci. Technol. , 8 443–449 (1997) 4. Twite, RL, Bierwagen, GP, ‘‘Review of Alternatives to Chromate for Corrosion Protection of Aluminum Aerospace Alloys.’’ Prog. Org. Coat. , 33 91–100 (1998) 5. Metroke, TL, Parkhill, RL, Knobbe, ET, ‘‘Passivation of Metal Alloys Using Sol–Gel-Derived Materials—A Re- view.’’ Prog. Org. Coat. , 41 233–238 (2001) 6. Van Ooij, WJ, et al., ‘‘Corrosion Protection Properties of Organofunctional Silanes—An Overview.’’ Tsinghua Sci. Technol. , 10 639–664 (2005) 7. Gray, J, Luan, B, ‘‘Protective Coatings on Magnesium and Its Alloys—A Critical Review.’’ J. Alloys Compd. , 336 88– 113 (2002) 8. Aegerter, MA, Mennig, M, Sol–Gel Technologies for Glass Producers and Users . Kluwer, Norwell, 2004 9. Dislich, H, ‘‘Glassy and Crystalline Systems from Gels: Chemical Basis and Technical Application.’’ J. Non Cryst. Solids , 57 371–388 (1983) 10. Segal, DL, ‘‘Sol–Gel Processing: Routes to Oxide Ceramics Using Colloidal Dispersions of Hydrous Oxides and Alkox- ide Intermediates.’’ J. Non-Cryst. Solids , 63 183–191 (1984) 11. Brinker, CJ, Scherer, GW, Sol–Gel Science: The Physics and Chemistry of Sol–Gel Processing . Academic Press, San Diego, 1990 12. Pierre, AC, In: Pierre, AC (ed.), Introduction to Sol–Gel Processing , p. 4. Kluwer Academic Publishers, Norwell, 1998 13. Brinker, C, Hurd, A, Schunk, P, Frye, G, ‘‘Review of Sol– Gel Thin Film Formation.’’ J. Non Cryst. Solids , 148 424–436 (1992) 14. Hench, LL, West, JK, ‘‘The Sol–Gel Process.’’ Chem. Rev. , 90 33–72 (1990) 15. Sanchez, C, Belleville, P, Popall, M, Nicole, L, ‘‘Hybrid Materials Themed Issue.’’ Chem. Soc. Rev. , 40 453–1152 (2011) 16. Sanchez, C, et al., ‘‘Designed Hybrid Organic–Inorganic Nanocomposites from Functional Nanobuilding Blocks.’’ Chem. Mater. , 13 3061–3083 (2001) 17. Shchukin, DG, Yaremchenko, AA, Ferreira, MGS, Kharton, VV, ‘‘Polymer Gel Templating Synthesis of Nanocrystalline Oxide Anodes.’’ Chem. Mater. , 17 5124–5129 (2005) 18. Canto, CF, de A. Prado, LAS, Radovanovic, E, Yoshida, IVP, ‘‘Organic–Inorganic Hybrid Materials Derived from Epoxy Resin and Polysiloxanes: Synthesis and Characteriza- tion.’’ Polym. Eng. Sci. , 48 141–148 (2008) 19. Sanchez, C, Ribot, F, ‘‘Design of Hybrid Organic–Inorganic Materials Synthesized Via Sol–Gel Chemistry.’’ New J.
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