Improvement of wear and corrosion protection of PEO on AA2024 via sol-gel sealing - Université de Lille
Article Dans Une Revue Surface and Coatings Technology Année : 2021

Improvement of wear and corrosion protection of PEO on AA2024 via sol-gel sealing

Résumé

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.
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Dates et versions

hal-03219885 , version 1 (06-05-2021)

Identifiants

Citer

Luciane Sopchenski, Julien Robert, Matthieu Touzin, Arnaud Tricoteaux, Marie-Georges Olivier. Improvement of wear and corrosion protection of PEO on AA2024 via sol-gel sealing. Surface and Coatings Technology, 2021, Surface and Coatings Technology, 417, pp.127195. ⟨10.1016/j.surfcoat.2021.127195⟩. ⟨hal-03219885⟩
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