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2021-09-22 - Colloque/Présentation - communication orale - Anglais - 1 page(s)

Akbarzadeh Sajjad , Sopchenski Santos Luciane , Vitry Véronique , Olivier Marie-Georges , "Improvement of the corrosion performance of AA2024 by a duplex PEO/clay modified sol-gel nanocomposite coating" in EUROCORR2021, Virtuel (Budapest), Hongrie, 2021

  • 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)

Abstract(s) :

(Anglais) Due to the intrinsic porosity of the layers formed by plasma electrolytic oxidation (PEO)process, the application of silane-based coatings as an eco-friendly layer is a promising way to diminish penetration of the corrosive species into the PEO coating by pores sealing. In this study, in order to enhance the corrosion protection of AA2024, the performance of the duplex system achieved by adding different concentrations in sodium montmorillonite dispersed into the silane coating was assessed. In this study, a hybrid sol-gel layer (30% V/V) obtained from a tetraethoxysilane (TEOS) and 3-glycidoxypropyltrimethoxysilane (GPTMS) sol-gel solution is applied onAA2024 previously covered by an optimized PEO layer using a solution containing sodium silicate and potassium hydroxide solution as electrolyte. Electrochemical impedance spectroscopy (EIS) revealed the significant impact of the sol-gel/clay nanocomposite layer on the corrosion protection performance of the PEO layer on the AA2024 substrate in 3.5% NaCl solution. The morphology and the duplex coating stucture were highlighted by using Scanning electron microscope (SEM). The flake-like structure of sodium montmorillonite not only enhanced the barrier performance, but also FT-IR outcomes reflected the reticulation of the silane network through the interaction of nanoparticles with SiOH groups of the silane layer.