Fernández-Hernán, J.P.Alves, M.M.Taryba, M.G.Montemor, M.F.Torres, B.Rams, J.2025-07-222025-07-222025-05-21J.P. Fernández-Hernán, M.M. Alves, M.G. Taryba, M.F. Montemor, B. Torres, J. Rams, Functionalized graphene – Modified sol-gel coatings: Controlling the degradation of bioresorbable AZ31 magnesium alloy for biomedical applications, Journal of Materials Research and Technology, Volume 36, 2025, Pages 9815-9830, ISSN 2238-7854, https://doi.org/10.1016/j.jmrt.2025.05.162.2214-0697 (online)2238-7854 (print)https://hdl.handle.net/10115/94137The fast degradation of Mg alloys requires strategies tailored for the controlled delay of corrosion. Pristine hybrid silica sol-gel coatings (SG) and sol-gel coatings doped with 0.05 wt% COOH-functionalized graphene nanoplatelets (SG + GNP) were successfully generated on AZ31 magnesium alloy substrates by dip-coating. The physicochemical properties and the anticorrosion behaviour of the coatings were evaluated by Field Emission Gun – Scanning Electron Microscope (FEG-SEM), Energy Dispersive Spectroscopy (EDS), ASTM D3359 standard adhesion tests, scanning vibrating electrode technique (SVET), scanning ion-selective electrode technique (SIET), and electrochemical impedance spectroscopy (EIS). Both coatings improved the behaviour in terms of localized and general corrosion, with the SG + GNP coating offering better protection. The presence of the COOHfunctionalized graphene nanoplatelets enhanced the mechanical properties of the sol-gel coating, improving their adhesion resistance and making them less brittle, and therefore offering a better barrier effect and anticorrosion protection. Also, high Ca–P accumulations were found after corrosion tests on both sol-gel coatings, indicative of in-vitro biocompatibility. Thus, SG + GNP coatings can enhance corrosion resistance and biocompatibility of magnesium alloys for biomedical applications.enAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Sol-GelCoatingsGraphene nanoplateletsCorrosionEISSVETSIETArticlehttps://doi.org/10.1016/j.jmrt.2025.05.162info:eu-repo/semantics/openAccess