Samenvatting
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.
| Originele taal-2 | English |
|---|---|
| Artikelnummer | 127195 |
| Tijdschrift | Surface and Coatings Technology |
| Volume | 417 |
| DOI's | |
| Status | Published - 15 jul 2021 |
Bibliografische nota
Funding Information:This work has been financially supported by the Interreg France-Wallonie-Vlaanderen program (TRANSPORT), and the University of Mons (ARC SEALCERA). The SEM facility in Lille (France) is supported by the Conseil Régional des Hauts-de-France, and the European Regional Development Fund (ERDF).
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© 2021 Elsevier B.V.
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Copyright 2021 Elsevier B.V., All rights reserved.