Degradation Rate Control Issues of PEO-Coated Wrought Mg0.5Zn0.2Ca Alloy

Bioactive plasma electrolytic oxidation (PEO) coatings were developed on a wrought Mg0.5Zn0.2Ca alloy using a transparent electrolyte for easy maintenance and waste disposal, compared to a conventional suspension-based solution. Treatment times of 300, 600, and 900 s were evaluated for their effects...

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Autores: Moreno, Lara, Mohedano, Marta, Arrabal, Raúl, Matykina, Endzhe
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2024
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/356293
Acceso en línea:http://hdl.handle.net/10261/356293
Access Level:acceso abierto
Palabra clave:degradation rate
wrought Mg-Zn-Ca alloy
coating
crevice
plasma electrolytic oxidation
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spelling Degradation Rate Control Issues of PEO-Coated Wrought Mg0.5Zn0.2Ca AlloyMoreno, LaraMohedano, MartaArrabal, RaúlMatykina, Endzhedegradation ratewrought Mg-Zn-Ca alloycoatingcreviceplasma electrolytic oxidationBioactive plasma electrolytic oxidation (PEO) coatings were developed on a wrought Mg0.5Zn0.2Ca alloy using a transparent electrolyte for easy maintenance and waste disposal, compared to a conventional suspension-based solution. Treatment times of 300, 600, and 900 s were evaluated for their effects on coating morphology, composition, and corrosion resistance. A short-time electrochemical impedance spectroscopy (EIS) screening was utilized to identify coatings with optimal corrosion protection. To assess the degradation rate and corrosion mechanisms, hydrogen evolution was monitored under pH-controlled quasi-in vivo conditions over extended immersion periods. Coating thickness increased by only 3% from 300 to 900 s of treatment (13 and 18 µm, respectively), with pore bands formed near the barrier layer at 900 s. The short-term EIS screening revealed that the coatings produced at 600 and 900 s were less protective and consistent than those at 300 s due to the presence of pore bands, which increased permeability. Hydrogen evolution measurements during 5 days of immersion at pH 7.4 indicated a tenfold higher degradation rate of the PEO-coated alloy compared to the bare substrate. Therefore, none of the PEO coatings provided effective corrosion protection after 24 h of immersion, which is attributed to crack formation at the PEO/corrosion products interface. This highlights the importance of crevices in the corrosion of Mg-Zn-Ca alloys. The presence of ZnO exacerbates the corrosion of magnesium in crevice areas.The support of the ADITIMAT-CM project (S2018/NMT-4411, Regional Government of Madrid and EU Structural and Social Funds) and PID2021-124341OB-C22 (MCIU) are gratefully acknowledged. M. Mohedano is grateful for the support of RYC-2017-21843.Multidisciplinary Digital Publishing InstituteComunidad de MadridEuropean CommissionMinisterio de Ciencia, Innovación y Universidades (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2024202420242024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/356293reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-124341OB-C22http://dx.doi.org/10.3390/coatings14030309Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3562932026-05-22T06:33:51Z
dc.title.none.fl_str_mv Degradation Rate Control Issues of PEO-Coated Wrought Mg0.5Zn0.2Ca Alloy
title Degradation Rate Control Issues of PEO-Coated Wrought Mg0.5Zn0.2Ca Alloy
spellingShingle Degradation Rate Control Issues of PEO-Coated Wrought Mg0.5Zn0.2Ca Alloy
Moreno, Lara
degradation rate
wrought Mg-Zn-Ca alloy
coating
crevice
plasma electrolytic oxidation
title_short Degradation Rate Control Issues of PEO-Coated Wrought Mg0.5Zn0.2Ca Alloy
title_full Degradation Rate Control Issues of PEO-Coated Wrought Mg0.5Zn0.2Ca Alloy
title_fullStr Degradation Rate Control Issues of PEO-Coated Wrought Mg0.5Zn0.2Ca Alloy
title_full_unstemmed Degradation Rate Control Issues of PEO-Coated Wrought Mg0.5Zn0.2Ca Alloy
title_sort Degradation Rate Control Issues of PEO-Coated Wrought Mg0.5Zn0.2Ca Alloy
dc.creator.none.fl_str_mv Moreno, Lara
Mohedano, Marta
Arrabal, Raúl
Matykina, Endzhe
author Moreno, Lara
author_facet Moreno, Lara
Mohedano, Marta
Arrabal, Raúl
Matykina, Endzhe
author_role author
author2 Mohedano, Marta
Arrabal, Raúl
Matykina, Endzhe
author2_role author
author
author
dc.contributor.none.fl_str_mv Comunidad de Madrid
European Commission
Ministerio de Ciencia, Innovación y Universidades (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv degradation rate
wrought Mg-Zn-Ca alloy
coating
crevice
plasma electrolytic oxidation
topic degradation rate
wrought Mg-Zn-Ca alloy
coating
crevice
plasma electrolytic oxidation
description Bioactive plasma electrolytic oxidation (PEO) coatings were developed on a wrought Mg0.5Zn0.2Ca alloy using a transparent electrolyte for easy maintenance and waste disposal, compared to a conventional suspension-based solution. Treatment times of 300, 600, and 900 s were evaluated for their effects on coating morphology, composition, and corrosion resistance. A short-time electrochemical impedance spectroscopy (EIS) screening was utilized to identify coatings with optimal corrosion protection. To assess the degradation rate and corrosion mechanisms, hydrogen evolution was monitored under pH-controlled quasi-in vivo conditions over extended immersion periods. Coating thickness increased by only 3% from 300 to 900 s of treatment (13 and 18 µm, respectively), with pore bands formed near the barrier layer at 900 s. The short-term EIS screening revealed that the coatings produced at 600 and 900 s were less protective and consistent than those at 300 s due to the presence of pore bands, which increased permeability. Hydrogen evolution measurements during 5 days of immersion at pH 7.4 indicated a tenfold higher degradation rate of the PEO-coated alloy compared to the bare substrate. Therefore, none of the PEO coatings provided effective corrosion protection after 24 h of immersion, which is attributed to crack formation at the PEO/corrosion products interface. This highlights the importance of crevices in the corrosion of Mg-Zn-Ca alloys. The presence of ZnO exacerbates the corrosion of magnesium in crevice areas.
publishDate 2024
dc.date.none.fl_str_mv 2024
2024
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/356293
url http://hdl.handle.net/10261/356293
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-124341OB-C22
http://dx.doi.org/10.3390/coatings14030309
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute
publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.812455

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