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    Effect of graphene oxide and fluorinated polymeric chains incorporated in a multilayered sol-gel nanocoating for the design of corrosion resistant and hydrophobic surfaces

    Year: 2017

    Journal: Appl. Surf. Sci., Volume 419, OCT 15, page 138–149

    Authors: Maeztu, Juan Deyo; Rivero, Pedro J.; Berlanga, Carlos; Bastidas, David M.; Palacio, Jose F.; Rodriguez, Rafael

    Organizations: Spanish Economy and Competitiveness Ministry-FEDER Proyecto Retos [TRA2013-48603-C4-1-R]; Public University of Navarre collaboration research grants

    Keywords: Graphene oxide; Fluorinated polymeric chains; Multilayer sol-gel hybrid coatings; Nanostructured coatings; Corrosion resistance; Hydrophobicity

    In this work, it is proposed a multilayer sol-gel nanocoating onto aluminum alloys for the fabrication of new surfaces with a dual property of hydrophobicity and corrosion resistance. A study of two experimental variables such as number of dips and thermal treatment has been performed in order to have a better optimization of the nanocoatings with the desired corrosion resistance properties. A combination of a hybrid sol-gel matrix to host the corrosion inhibitor (graphene oxide) with a simple sol-gel matrix to provide hydrophobic properties (fluorinated polymeric chains) is presented. The effect of the thermal treatment is also analyzed for the formation of highly cross-linked sol-gel matrices with an improvement in the mechanical and hydrophobic properties. The surface and coating morphology have been determined by using atomic force microscopy, profilometry and scanning electron microscopy; whereas the hydrophobicity was determined by measurements of the water contact angle. Finally, the corrosion resistance of the sol-gel coatings has been determined usingpotentiodynamic polarization and electrochemical impedance spectroscopy. These results open up a new perspective for the design and implementation of novel coatings in applications of high performance. (C) 2017 Elsevier B.V. All rights reserved.
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