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2021-07-15 - Article/Dans un journal avec peer-review - Anglais - 11 page(s)

Sopchenski Santos Luciane , Robert Julien, Touzin Mathieu, Tricoteaux Arnaud, Olivier Marie-Georges , "Improvement of wear and corrosion protection of PEO on AA2024 via sol-gel sealing" in Surface and Coatings Technology, 417, 1-11, 127195

  • Edition : Elsevier (Netherlands)
  • 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) Plasma electrolytic oxidation (PEO) is a versatile and cost-effective technique to obtain protective oxide coatings in light metals, although its intrinsic porosity is a drawback for long-term corrosion resistance. Sol-gel layers are pointed as a useful tool to seal PEO porosity and increase its corrosion resistance, although little is known about its influence on the wear performance of PEO coatings. In this study, a PEO coating obtained on AA2024 was sealed with a hybrid sol-gel via dip-coating. Two withdrawal speeds were set in order to investigate the influence of the sol-gel filling in its sealing ability. Both sol-gel application conditions were able to fill the PEO pores and microcracks and change its wettability. EIS results showed samples sealed with sol-gel maintained the protective behavior upon 28 days and increased the resistance of the system by several orders of magnitude in comparison to unsealed PEO coatings. Pin-on-disk tests indicate the sol-gel decrease the shear stresses of the coating, decreasing its wear rate in 40% compared to the unsealed PEO.