Effect of ZrO2 and L-Cys nanoparticles as dopants in sol-gel of mesoporous silica coating for corrosion protection of AZ61 magnesium alloy

Sol-gel coatings based on GPTMS-TMOS precursor, including as dopants L-Cysteine and ZrO2 in different concentrations, were applied on the surface of AZ61 magnesium alloy. Their corrosion resistance was studied in 0.6M NaCl solution, by immersion up to 14 days. XRD spectra revealed Mg(OH)2 as the mai...

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Autores: Hernández, L., Veleva, Lucien, García Galván, Federico, Galván Sierra, Juan Carlos
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/204515
Acceso en línea:http://hdl.handle.net/10261/204515
Access Level:acceso abierto
Palabra clave:AZ61
Corrosion
EIS
Magnesium alloy
Sol-gel coating
XRD
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spelling Effect of ZrO2 and L-Cys nanoparticles as dopants in sol-gel of mesoporous silica coating for corrosion protection of AZ61 magnesium alloyHernández, L.Veleva, LucienGarcía Galván, FedericoGalván Sierra, Juan CarlosAZ61CorrosionEISMagnesium alloySol-gel coatingXRDSol-gel coatings based on GPTMS-TMOS precursor, including as dopants L-Cysteine and ZrO2 in different concentrations, were applied on the surface of AZ61 magnesium alloy. Their corrosion resistance was studied in 0.6M NaCl solution, by immersion up to 14 days. XRD spectra revealed Mg(OH)2 as the main corrosion product on the coated surface, while on the untreated AZ61 in addition there were several compounds of Zn with chloride. The localized corrosion attack on the untreated AZ61 was expressed by cracks and caverns, while on the dip-coated surface the corrosion was mostly through pitting. Two non-destructive electrochemical methods were employed, contrasting the electrochemical behavior of coated AZ61 with that of uncoated alloy. The tendency in the changes of the corrosion potential at open circuit correlated positively with SEM-EDS and XRD analysis. The EIS diagrams were fitted to equivalent-circuit model and the obtained corrosion resistance Rcorr (Rs + Rct) values strongly decreased over time. The ZrO2 and L-Cysteine effect is influenced by the pH changes of the solution, Zeta potential surface charge, chemisorption and desorption processes, internal stress in the sol-gel precursor, as well as the change in its structure, after the encapsulation of both dopants.L. Hernández gratefully thanks CONACYT for his scholarship as Ph.D. student at CINVESTAV-IPN and for the research stay at CENIM/CSIC (the National Center for metallurgical Research of Madrid, Spain). The authors acknowledge LANNBIO-CINVESTAV for permitting the use of their facilities, as well to D. Aguilar-Treviño, D. Huerta-Quintanilla, and G. Espinoza-Gurriz for their technical assistance.Editorial CSICConsejo Nacional de Ciencia y Tecnología (México)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2020202020192020info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/204515reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.3989/revmetalm.155Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2045152026-05-22T06:33:51Z
dc.title.none.fl_str_mv Effect of ZrO2 and L-Cys nanoparticles as dopants in sol-gel of mesoporous silica coating for corrosion protection of AZ61 magnesium alloy
title Effect of ZrO2 and L-Cys nanoparticles as dopants in sol-gel of mesoporous silica coating for corrosion protection of AZ61 magnesium alloy
spellingShingle Effect of ZrO2 and L-Cys nanoparticles as dopants in sol-gel of mesoporous silica coating for corrosion protection of AZ61 magnesium alloy
Hernández, L.
AZ61
Corrosion
EIS
Magnesium alloy
Sol-gel coating
XRD
title_short Effect of ZrO2 and L-Cys nanoparticles as dopants in sol-gel of mesoporous silica coating for corrosion protection of AZ61 magnesium alloy
title_full Effect of ZrO2 and L-Cys nanoparticles as dopants in sol-gel of mesoporous silica coating for corrosion protection of AZ61 magnesium alloy
title_fullStr Effect of ZrO2 and L-Cys nanoparticles as dopants in sol-gel of mesoporous silica coating for corrosion protection of AZ61 magnesium alloy
title_full_unstemmed Effect of ZrO2 and L-Cys nanoparticles as dopants in sol-gel of mesoporous silica coating for corrosion protection of AZ61 magnesium alloy
title_sort Effect of ZrO2 and L-Cys nanoparticles as dopants in sol-gel of mesoporous silica coating for corrosion protection of AZ61 magnesium alloy
dc.creator.none.fl_str_mv Hernández, L.
Veleva, Lucien
García Galván, Federico
Galván Sierra, Juan Carlos
author Hernández, L.
author_facet Hernández, L.
Veleva, Lucien
García Galván, Federico
Galván Sierra, Juan Carlos
author_role author
author2 Veleva, Lucien
García Galván, Federico
Galván Sierra, Juan Carlos
author2_role author
author
author
dc.contributor.none.fl_str_mv Consejo Nacional de Ciencia y Tecnología (México)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv AZ61
Corrosion
EIS
Magnesium alloy
Sol-gel coating
XRD
topic AZ61
Corrosion
EIS
Magnesium alloy
Sol-gel coating
XRD
description Sol-gel coatings based on GPTMS-TMOS precursor, including as dopants L-Cysteine and ZrO2 in different concentrations, were applied on the surface of AZ61 magnesium alloy. Their corrosion resistance was studied in 0.6M NaCl solution, by immersion up to 14 days. XRD spectra revealed Mg(OH)2 as the main corrosion product on the coated surface, while on the untreated AZ61 in addition there were several compounds of Zn with chloride. The localized corrosion attack on the untreated AZ61 was expressed by cracks and caverns, while on the dip-coated surface the corrosion was mostly through pitting. Two non-destructive electrochemical methods were employed, contrasting the electrochemical behavior of coated AZ61 with that of uncoated alloy. The tendency in the changes of the corrosion potential at open circuit correlated positively with SEM-EDS and XRD analysis. The EIS diagrams were fitted to equivalent-circuit model and the obtained corrosion resistance Rcorr (Rs + Rct) values strongly decreased over time. The ZrO2 and L-Cysteine effect is influenced by the pH changes of the solution, Zeta potential surface charge, chemisorption and desorption processes, internal stress in the sol-gel precursor, as well as the change in its structure, after the encapsulation of both dopants.
publishDate 2019
dc.date.none.fl_str_mv 2019
2020
2020
2020
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/10261/204515
url http://hdl.handle.net/10261/204515
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.3989/revmetalm.155
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Editorial CSIC
publisher.none.fl_str_mv Editorial CSIC
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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