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LDH conversion films for active protection of AZ31 Mg alloy Pillado Ríos, Borja Mingo, Beatriz Del Olmo Martínez, Rubén Matykina, Endzhe Kooijman, A.M. Gonzalez-Garcia, Y. Arrabal Durán, Raúl Mohedano Sánchez, Marta 620 AZ31 Magnesium Layered Double Hydroxydes Corrosion inhibitors Active corrosion protection Materiales 3312 Tecnología de Materiales Zinc aluminium (Zn-Al) and lithium aluminium (Li-Al) – layered double hydroxides (LDH) coatings with incorporated inhibitors (Li−, Mo− and W−based) were successfully synthesized on AZ31 Mg alloy. Zn−Al LDH W and Li−Al LDH Li showed the highest corrosion resistance and were selected for further evaluation. SEM cross−section examination revealed a bi−layer structure composed of an outer part with loose flakes and a denser inner layer. XRD, FTIR, and XPS analysis confirmed the incorporation of the inhibitors. Post−treatments with corrosion inhibitors containing solutions resulted in the selective dissolution of the most external layer of the LDH coating, reducing the surface roughness, hydrophilicity and paint adhesion of the layers. Active corrosion properties were confirmed by SVET evaluation for the Zn−Al LDH W coating. The proposed active corrosion mechanism involves the ion−exchange of aggressive Cl− ions, deposition of hydroxides and competitive adsorption of W−rich corrosion inhibitors. Agencia Estatal de Investigación Ministerio de Ciencia, Innovación y Universidades FEDER, EU Comunidad de Madrid Royal Academy of Engineering Depto. de Ingeniería Química y de Materiales Fac. de Ciencias Químicas TRUE pub 2025-02-14T09:52:58Z 2025-02-14T09:52:58Z 2022-09-03 journal article VoR https://hdl.handle.net/20.500.14352/118079 XXXX-XXXX 10.1016/j.jma.2022.09.014 eng PID2021–124341OB-C22/AEI/10.13039/501100011033/FEDER RTI2018-096391-B-C33 RYC-2017-21843 EP/V026097/1 B. Pillado, B. Mingo, R. del Olmo, E. Matykina, A.M. Kooijman, Y. Gonzalez−Garcia, R. Arrabal, M. Mohedano, LDH conversion films for active protection of AZ31 Mg alloy, Journal of Magnesium and Alloys, Volume 11, Issue 1, 2023, Pages 201-216, ISSN 2213-9567, https://doi.org/10.1016/j.jma.2022.09.014. Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ open access application/pdf KEAI Publishing LTD