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2020-09-10 - Colloque/Présentation - poster - Anglais - page(s)

Sopchenski Santos Luciane , Portier Amandine , Vitry Véronique , Olivier Marie-Georges , "Barrier properties of Sol-Gel layer applied on PEO porous coatings for AA2024 corrosion protection" in Virtual Eurocorr2020, Bruxelles, Belgium, 2020

  • 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) Plasma electrolytic oxidation (PEO) is an electrochemical surface modification technique used to obtain adherent oxide coatings in valve metals, such as aluminum, titanium, and magnesium. By setting the appropriate electrical parameters and the electrolyte composition, it is possible to control the coating composition, thickness, crystalline structure, and morphology. PEO coatings possess high hardness and grant wear protection to the substrate. However, the corrosion protection has some limitations since PEO coatings are inherently porous due to the formation of plasma channels during the oxidation. Sol-gel coatings have been extensively investigated as a corrosion protection layer for aluminum substrates and might be an alternative to increase the corrosion resistance of PEO coatings. In this research, the sealing ability of a TEOS/GPTMS sol-gel layer applied on porous PEO coatings on AA2024 was investigated. The sol-gel layer was able to impregnate the PEO porosity, without changing the overall morphology of the coating. The corrosion resistance of the coatings was assessed by Electrochemical Impedance Spectroscopy (EIS). PEO coatings sealed with sol-gel presented increased corrosion resistance in comparison to stand-alone PEO coatings or sol-gel layers.