Mohedano Sánchez, MartaMatykina, EndzheArrabal Durán, RaúlMingo, B.Pardo, Angel2024-07-312024-07-312015-08-15M. Mohedano, E. Matykina, R. Arrabal, B. Mingo, A. Pardo, PEO of pre-anodized Al–Si alloys: Corrosion properties and influence of sealings, Applied Surface Science, Volume 346, 2015, Pages 57-67, ISSN 0169-4332, https://doi.org/10.1016/j.apsusc.2015.03.206.10.1016/j.apsusc.2015.03.206https://hdl.handle.net/20.500.14352/107293Voltage-controlled PEO coatings were developed on A356 aluminum alloys (gravity-cast and rheocast) with a pre-anodized layer. The influence of the alloy manufacturing process and the effect of Si-rich phase on the structure and composition of the oxide layers were evaluated using SEM, EDS and XRD. The pre-anodized oxide layer preserves the microstructure of the substrate due to the presence of secondary phases that have a different behavior relative to the matrix during anodizing. PEO coatings consisted of a mixture of α-Al2O3, γ-Al2O3 and mullite. The corrosion behavior and the effectiveness of different sealing techniques based on salts of nickel, cobalt, cerium and phosphonic acid were also studied. Post-treatments improved the hydrophobic properties of the coatings and showed a beneficial effect, significantly increasing the coating impedance and thereby reducing the susceptibility to corrosion.engAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/journal articlehttps://doi.org/10.1016/j.apsusc.2015.03.206https://www.sciencedirect.com/science/article/pii/S0169433215008223open access66620.1AluminumAnodizingPEOPost-treatmentCorrosionIngeniería químicaMateriales3303 Ingeniería y Tecnología Químicas3312 Tecnología de Materiales