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2013-03-03 - 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 Multifunctional, hybrid and nanomaterials, Sorrento, Italy, 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) Mesoporous thin films have already been used many times for applications such as drug delivery, photoelectrode in DSSC, gas sensors... The pore network developed through the film is in fact employed to host active compounds providing specific functionalities to the coating. The objective of this work is to assess the ability of mesoporous sol-gel films to constitute nanocontainers for corrosion inhibitors in anticorrosive coatings for 2024 aluminium. Hexavalent chromium is currently the most effective way to protect aluminium but this compound is particularly harmful for health and for environment. It consequently becomes urgent to find an alternative treatment. Among the different opportunities, sol-gel coatings present very promising properties. However, in opposition with chromates, they are not able to protect the bare metal in case of scratch in the coating. The objective is then to incorporate corrosion inhibitors inside the mesoporosity to confer self-healing ability to the film. Mesoporous SiO2 coatings were synthesized using TEOS and Pluronic P123 through EISA process. A first insight of the film structure was obtained by TEM. Analyzing the surface with AFM also allowed showing that pores are opened at the surface. However, these microscopes do not provide information about pore connectivity. A crystal quartz microbalance coupled with a climatic chamber was consequently used to determine the pore volume which is accessible from the surface. The principle consists in recording the water uptake while the film is submitted to variations in water vapor partial pressure. Different synthesis parameters were considered in order to modify the pore volume and accessibility which are very important parameters for the further incorporation step. Organic benzotriazole solution was used to impregnate the mesoporous film. This inhibitor is indeed very efficient for aluminium. UV-visible spectrophotometry and FTIR were used in order to determine the amount of benzotriazole encapsulated in the film.