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oai:docta.ucm.es:20.500.14352/713552024-09-03T13:57:00Zcom_20.500.14352_14col_20.500.14352_15

Hybrid sol-gel coatings doped with non-toxic corrosion inhibitors for corrosion protection on AZ61 magnesium alloy Rodríguez Alonso, Luis López Sánchez, Jesús Serrano, Aída Rodríguez De La Fuente, Óscar Galván, Juan Carlos Carmona Tejero, Noemí © 2022 by the authors. Licensee MDPI, The authors acknowledge the Spanish Ministry of Science and Innovation for financing the projects RTI2018-095856-B-C21 (AEI/FEDER; PIE: 2021-60-E-030, PIE: 2010-6-OE-013, and PID2019- 104717RB-I00). A.S. acknowledges the financial support from the Comunidad de Madrid for an “Atracción de Talento Investigador” contract (no. 2017-t2/IND5395). The authors acknowledge the CNME Unit of the UCM for SEM measurements. Physiological human fluid is a natural corrosive environment and can lead to serious corrosion and mechanical damages to light Mg-Al alloys used in prosthetics for biomedical applications. In this work, organic-inorganic hybrid coatings doped with various environmentally friendly and non-toxic corrosion inhibitors have been prepared by the sol-gel process for the corrosion protection of AZ61 magnesium alloys. Effectiveness has been evaluated by pH measurements, optical microscopy, and SEM during a standard corrosion test in a Hanks' Balanced Salt Solution. The results showed that the addition of an inhibitor to the sol-gel coating can improve significantly the corrosion performance, being an excellent barrier for the L-cysteine-doped hybrid sol-gel films. The incorporation of TiO2 nanoparticles, 2-Aminopyridine and quinine organic molecules slowed down the corrosion rate of the Mg-Al alloy. Graphene oxide seemed to have the same response to corrosion as the hybrid sol-gel coating without inhibitors. 2023-06-22T10:41:02Z 2023-06-22T10:41:02Z 2022-01 journal article 2310-2861 10.3390/gels8010034 https://hdl.handle.net/20.500.14352/71355 http://dx.doi.org/10.3390/gels8010034 https://www.mdpi.com/ eng RTI2018-095856-B-C21 (PIE 2021-60-E-030; PIE 2021-60-E-030; PID2019- 104717RB-I00) 2017-T2/IND5395 https://creativecommons.org/licenses/by/3.0/es/ open access Atribución 3.0 España MDPI