Flash-PEO of magnesium: Phosphate precursor driven functionalization

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...

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Detalles Bibliográficos
Autores: Guerra-Mutis, Marlon Hernando, Vega Vega, Jesus Manuel, Barrena Pérez, María Isabel, Matykina, Endzhe, Arrabal Durán, Raúl
Tipo de recurso: artículo
Fecha de publicación:2025
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/119023
Acceso en línea:https://hdl.handle.net/20.500.14352/119023
Access Level:acceso abierto
Palabra clave:620
669
AZ31B magnesium alloy
Phosphates
Chemical conversion coating
Flash plasma electrolytic oxidation
Electrochemical impedance spectroscopy
Transmission electron microscopy
Materiales
3312 Tecnología de Materiales
id ES_6f21bb69f1b7b4aeece76e17c403bc44
oai_identifier_str oai:docta.ucm.es:20.500.14352/119023
network_acronym_str ES
network_name_str España
repository_id_str
spelling Flash-PEO of magnesium: Phosphate precursor driven functionalizationGuerra-Mutis, Marlon HernandoVega Vega, Jesus ManuelBarrena Pérez, María IsabelMatykina, EndzheArrabal Durán, Raúl620669AZ31B magnesium alloyPhosphatesChemical conversion coatingFlash plasma electrolytic oxidationElectrochemical impedance spectroscopyTransmission electron microscopyMateriales3312 Tecnología de MaterialesIn 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.KEAIUniversidad Complutense de Madrid20252025-01-3120252025-01-31journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/119023reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/1190232026-06-02T12:44:21Z
dc.title.none.fl_str_mv Flash-PEO of magnesium: Phosphate precursor driven functionalization
title Flash-PEO of magnesium: Phosphate precursor driven functionalization
spellingShingle Flash-PEO of magnesium: Phosphate precursor driven functionalization
Guerra-Mutis, Marlon Hernando
620
669
AZ31B magnesium alloy
Phosphates
Chemical conversion coating
Flash plasma electrolytic oxidation
Electrochemical impedance spectroscopy
Transmission electron microscopy
Materiales
3312 Tecnología de Materiales
title_short Flash-PEO of magnesium: Phosphate precursor driven functionalization
title_full Flash-PEO of magnesium: Phosphate precursor driven functionalization
title_fullStr Flash-PEO of magnesium: Phosphate precursor driven functionalization
title_full_unstemmed Flash-PEO of magnesium: Phosphate precursor driven functionalization
title_sort Flash-PEO of magnesium: Phosphate precursor driven functionalization
dc.creator.none.fl_str_mv Guerra-Mutis, Marlon Hernando
Vega Vega, Jesus Manuel
Barrena Pérez, María Isabel
Matykina, Endzhe
Arrabal Durán, Raúl
author Guerra-Mutis, Marlon Hernando
author_facet Guerra-Mutis, Marlon Hernando
Vega Vega, Jesus Manuel
Barrena Pérez, María Isabel
Matykina, Endzhe
Arrabal Durán, Raúl
author_role author
author2 Vega Vega, Jesus Manuel
Barrena Pérez, María Isabel
Matykina, Endzhe
Arrabal Durán, Raúl
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 620
669
AZ31B magnesium alloy
Phosphates
Chemical conversion coating
Flash plasma electrolytic oxidation
Electrochemical impedance spectroscopy
Transmission electron microscopy
Materiales
3312 Tecnología de Materiales
topic 620
669
AZ31B magnesium alloy
Phosphates
Chemical conversion coating
Flash plasma electrolytic oxidation
Electrochemical impedance spectroscopy
Transmission electron microscopy
Materiales
3312 Tecnología de Materiales
description 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.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025-01-31
2025
2025-01-31
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/119023
url https://hdl.handle.net/20.500.14352/119023
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv KEAI
publisher.none.fl_str_mv KEAI
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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