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2013-07-15 - Colloque/Présentation - poster - Anglais - 1 page(s)

Recloux Isaline , Yoann Paint, Baroni Alexandra, Olivier Marie-Georges , "Use of SiO2 Mesoporous Thin Film as Nanocontainer for Benzotriazole in Anticorrosive Coating" in International Conference on Advanced Complex Inorganic Nanomaterials, Namur, Belgique, 2013

  • Codes CREF : Corrosion des matériaux (DI2114)
  • Unités de recherche UMONS : Science des Matériaux (F502)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Ingénierie des matériaux (CRIM)

Abstract(s) :

(Anglais) In the field of aeronautics, surface treatments achieved to protect 2024 aluminium are still based on the use of hexavalent chromates while these compounds are very harmful for health and for environment. Sol-gel coatings have been investigated as alternative treatments but are not as efficient as chromates as they are not able to provide healing properties to the metallic substrate. In order to impart this ability to the layer, mesoporous silica thin films were used and the mesoporosity was employed as a nanocontainer for corrosion inhibitors. It was already shown many times that incorporating active species inside the porosity could provide specific functionality to the film for different kind of applications such as catalyst, dye sensitized solar cells1, drug delivery2 … Synthesis conditions and characterization of mesoporous sol-gel coatings were optimized for 2024 aluminium alloy substrates. Mesostructured films were prepared by dip-coating through Evaporation Induced Self-Assembly (EISA) process, using tetraorthosilicate and Pluronic P123. The removal of the templating agent from the film was achieved via UV/ozone process at room temperature as mechanical properties of 2024 aluminium alloy are very sensitive to elevated temperatures. Morphology of mesoporous films was characterized by TEM imaging and pore size distribution was determined by adsorption porosimetry based on quartz crystal microbalance measurements. Benzotriazole is known to be a specific corrosion inhibitor for 2024 aluminium. An ethanolic solution of this compound was consequently used to impregnate mesoporous films and to impart active property to the layer. UV-visible spectrophotometry, coupled to Fourier transformed infrared spectrometry (FTIR), were used in order to determine if benzotriazole is able to soak into the pores due to capillarity forces and if the compound can be released from the film when corrosion processes appear. Benefits brought by the presence of corrosion inhibitors inside the film were also evidenced through corrosion tests using electrochemical impedance spectroscopy (EIS). 1. J. Dewalque, R. Cloots, F. Mathis, O. Dubreuil, N. Krins, C. Henrist, J. Mater. Chem., 21, 7356 (2011). 2. I. Izquiedo-Barba, M. Vallet-Regi, N. Kupferschmidt, O. Terasaki, A. Schmidtchen, M. Malmsten, Biomaterials, 30, 5729 (2009).