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2019-09-11 - Colloque/Présentation - poster - Anglais - 1 page(s)

De Freitas Fernanda Gabriel , Bertolucci Coelho Leonardo , Kossman Stéphania, Montagne Alex, Poorteman Marc , Olivier Marie-Georges , "Improvement of the corrosion and mechanical properties of stainless steel by sol-gel hybrid coatings : a first approach" in Eurocorr 2019, Sevilla, Spain, 2019

  • Codes CREF : Enseignement des sciences de l'ingénieur (DI0132), 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)
Texte intégral :

Abstract(s) :

(Anglais) Austenitic stainless steel is widely used in the chemical, petrochemical, pharmaceutical, food, and other industries. Its industrial use is due to its high corrosion resistance in neutral/alkaline media [1]. Nevertheless, studies combining corrosion and tribocorrosion behaviour of stainless steel remain scarce but have gained interest in the transport applications where damages can appear by friction. This study is involved in the framework of the Transport INTERREG Project and focuses on the development of pretreatments aiming at preventing the damage due to a contact between different parts of the metallic structure and so preventing the tribocorrosion [2]. This work aims at improving the tribocorrosion, corrosion and mechanical properties of 316L stainless steel, through the deposition of hybrid sol-gel films. The influence of different parameters such as the surface preparation, the functional groups of the precursors and/or use of polymerization agents were investigated [3-5]. In this context, the hybrid coatings were prepared via the sol-gel process with controlled pH, by using different ratios of distilled water/alcohol and different types of silanes, such as: (3-aminopropyl)triethoxysilane (APTES), tetraethylorthosilicate (TEOS), (3-mercaptopropyl)trimethoxysilane (MPTS) and (3-glycidyloxypropyl)trimethoxysilane (GPTMS). The hybrid films presenting the most promising electrochemical properties were selected for the incorporation of zirconium dioxide (ZrO2) and/or zirconium phosphate (ZrP) compounds. The solutions were characterized using FTIR, turbidimetry, rheology and zeta potential measurements. The morphology of the coatings was investigated by using XPS, SEM-EDS analyses while nanoindentation/pin-on-disc tests were carried out to highlight their mechanical/tribological properties. Finally, EIS measurements were performed in order to evaluate the anti-corrosion behavior of the hybrid coating/substrate systems exposed to NaCl solution. As a future perspective, the tribocorrosion was also studied by OCP measurement under friction conditions in aggressive media. [1] R. Z. Zand et al. J. Prog. Coat, 06 (2012) 008. [2] R. B. Figueira et al. J. Coat. Technol. Res., 12 (2015), 1–35. [3] A. E. Danks et al. Mater. Horiz., 3, (2016), 91. [4] L. V. Mora et al. J. Surf. Coat., 2 (2018), 080. [5] H. Xiao et al. J. Mat. Des., 5 (2018), 041.