2026-06-08T04:51:33Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/1190232025-03-29T00:57:22Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Guerra-Mutis, Marlon Hernando
author
Vega Vega, Jesus Manuel
author
Barrena Pérez, María Isabel
author
Matykina, Endzhe
author
Arrabal Durán, Raúl
2025-03-28T13:23:01Z
2025-03-28T13:23:01Z
2025-01-31
M.H. Guerra-Mutis, J.M. Vega, M.I. Barrena, E. Matykina, R. Arrabal, Flash-PEO of magnesium: Phosphate precursor driven functionalization, Journal of Magnesium and Alloys, 13 (2) (2025) 592-612. https://doi.org/10.1016/j.jma.2025.01.007.
10.1016/j.jma.2025.01.007
https://hdl.handle.net/20.500.14352/119023
2213-9567
https://doi.org/10.1016/j.jma.2025.01.007
https://www.sciencedirect.com/science/article/pii/S2213956725000210
In this study, a phosphate-based conversion coating (PCC) was applied as a precursor before forming silicate-fluoride (SiF) and silicate-phosphate-fluoride (SiPF) based flash-plasma electrolytic oxidation (Flash-PEO) coatings on AZ31B magnesium alloy. The main novelty is the successful incorporation of calcium, zinc, manganese and phosphate species into the Flash-PEO coatings via a precursor layer rather than using the electrolyte. The precursor also led to longer lasting and more intense discharges during the PEO process, resulting in increased pore size. Corrosion studies revealed similar short-term performance for all coatings, with impedance modulus at low frequencies above 10^7 Ωcm2, and slightly better performance for the SiPF-based coating. Nonetheless, the enlarged pores in the PEO coatings functionalized with the PCC precursor compromised the effectiveness of self-healing mechanisms by creating diffusion pathways for corrosive species, leading to earlier failure. These phenomena were effectively monitored by recording the open circuit potential during immersion in 0.5 wt.% NaCl solution. In summary, this study demonstrates that conversion coatings are a viable option for the functionalization of PEO coatings on magnesium alloys, as they allow for the incorporation of cationic and other species. However, it is crucial to maintain a small pore size to facilitate effective blockage through self-healing mechanisms.
eng
Attribution-NonCommercial-NoDerivatives 4.0 International
Flash-PEO of magnesium: Phosphate precursor driven functionalization
journal article
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URL
https://docta.ucm.es/bitstreams/90f1c589-60c7-4cd5-8d57-33bcbcf416dc/download
File
MD5
e9cc83216b2fafef25055a7dd27df31b
8790339
application/pdf
JMA_PCC_precursor.pdf