Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel

Autores
Culcasi, José Daniel; Elsner, Cecilia Inés; Di Sarli, Alejandro Ramón; Palomino, Luis; Tomachuk, C. R.; Costas, Isolda
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Ce-based conversion films have been assessed as alternatives for replacement of Cr6+-based films,which have been forbidden for their toxicity and carcinogenic properties. However, corrosion protection associated with chromate films is difficult to achieve by other surface treatments. Experimental results have revealed that to obtain the highly satisfactory results provided by chromate-based conversion coatings, it is necessary to improve the anticorrosive properties of the new chromium-free coatings. The present work deals with the effect of the oxidant concentration in the cerium-based conversion baths on the corrosion resistance of the films deposited on galvanized steel. Electrogalvanized steel sheets were exposed to cerium chloride-based baths with different concentrations of oxidant for a minute. The surface of the treated samples was analyzed by XPS and SEM-EDXS, while its corrosion resistance was investigated using electrochemical tests (EIS) conducted in a 0.05 M NaCl solution and the impedance spectra evolution analyzed as a function of the exposure time. The results showed a direct relationship between oxidant concentration and corrosion resistance. When the oxidant concentration rose from2mL.L-1 to 12mL.L-1, the corrosion resistance increased about 5 times, and this was attributed to the decrease in the Ce3+/Ce4+ relationship of the conversion film.
Centro de Investigación y Desarrollo en Tecnología de Pinturas (CIDEPINT)
Materia
Ingeniería
Galvanized steel
Ce-based conversion films
Corrosion
EIS
SEM
EDXS
XPS
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-nd/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/81358

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network_name_str SEDICI (UNLP)
spelling Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized SteelCulcasi, José DanielElsner, Cecilia InésDi Sarli, Alejandro RamónPalomino, LuisTomachuk, C. R.Costas, IsoldaIngenieríaGalvanized steelCe-based conversion filmsCorrosionEISSEMEDXSXPSCe-based conversion films have been assessed as alternatives for replacement of Cr6+-based films,which have been forbidden for their toxicity and carcinogenic properties. However, corrosion protection associated with chromate films is difficult to achieve by other surface treatments. Experimental results have revealed that to obtain the highly satisfactory results provided by chromate-based conversion coatings, it is necessary to improve the anticorrosive properties of the new chromium-free coatings. The present work deals with the effect of the oxidant concentration in the cerium-based conversion baths on the corrosion resistance of the films deposited on galvanized steel. Electrogalvanized steel sheets were exposed to cerium chloride-based baths with different concentrations of oxidant for a minute. The surface of the treated samples was analyzed by XPS and SEM-EDXS, while its corrosion resistance was investigated using electrochemical tests (EIS) conducted in a 0.05 M NaCl solution and the impedance spectra evolution analyzed as a function of the exposure time. The results showed a direct relationship between oxidant concentration and corrosion resistance. When the oxidant concentration rose from2mL.L-1 to 12mL.L-1, the corrosion resistance increased about 5 times, and this was attributed to the decrease in the Ce3+/Ce4+ relationship of the conversion film.Centro de Investigación y Desarrollo en Tecnología de Pinturas (CIDEPINT)2014info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf85-94http://sedici.unlp.edu.ar/handle/10915/81358enginfo:eu-repo/semantics/altIdentifier/issn/0974-7443info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:15:06Zoai:sedici.unlp.edu.ar:10915/81358Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:15:06.799SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel
title Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel
spellingShingle Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel
Culcasi, José Daniel
Ingeniería
Galvanized steel
Ce-based conversion films
Corrosion
EIS
SEM
EDXS
XPS
title_short Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel
title_full Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel
title_fullStr Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel
title_full_unstemmed Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel
title_sort Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel
dc.creator.none.fl_str_mv Culcasi, José Daniel
Elsner, Cecilia Inés
Di Sarli, Alejandro Ramón
Palomino, Luis
Tomachuk, C. R.
Costas, Isolda
author Culcasi, José Daniel
author_facet Culcasi, José Daniel
Elsner, Cecilia Inés
Di Sarli, Alejandro Ramón
Palomino, Luis
Tomachuk, C. R.
Costas, Isolda
author_role author
author2 Elsner, Cecilia Inés
Di Sarli, Alejandro Ramón
Palomino, Luis
Tomachuk, C. R.
Costas, Isolda
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Ingeniería
Galvanized steel
Ce-based conversion films
Corrosion
EIS
SEM
EDXS
XPS
topic Ingeniería
Galvanized steel
Ce-based conversion films
Corrosion
EIS
SEM
EDXS
XPS
dc.description.none.fl_txt_mv Ce-based conversion films have been assessed as alternatives for replacement of Cr6+-based films,which have been forbidden for their toxicity and carcinogenic properties. However, corrosion protection associated with chromate films is difficult to achieve by other surface treatments. Experimental results have revealed that to obtain the highly satisfactory results provided by chromate-based conversion coatings, it is necessary to improve the anticorrosive properties of the new chromium-free coatings. The present work deals with the effect of the oxidant concentration in the cerium-based conversion baths on the corrosion resistance of the films deposited on galvanized steel. Electrogalvanized steel sheets were exposed to cerium chloride-based baths with different concentrations of oxidant for a minute. The surface of the treated samples was analyzed by XPS and SEM-EDXS, while its corrosion resistance was investigated using electrochemical tests (EIS) conducted in a 0.05 M NaCl solution and the impedance spectra evolution analyzed as a function of the exposure time. The results showed a direct relationship between oxidant concentration and corrosion resistance. When the oxidant concentration rose from2mL.L-1 to 12mL.L-1, the corrosion resistance increased about 5 times, and this was attributed to the decrease in the Ce3+/Ce4+ relationship of the conversion film.
Centro de Investigación y Desarrollo en Tecnología de Pinturas (CIDEPINT)
description Ce-based conversion films have been assessed as alternatives for replacement of Cr6+-based films,which have been forbidden for their toxicity and carcinogenic properties. However, corrosion protection associated with chromate films is difficult to achieve by other surface treatments. Experimental results have revealed that to obtain the highly satisfactory results provided by chromate-based conversion coatings, it is necessary to improve the anticorrosive properties of the new chromium-free coatings. The present work deals with the effect of the oxidant concentration in the cerium-based conversion baths on the corrosion resistance of the films deposited on galvanized steel. Electrogalvanized steel sheets were exposed to cerium chloride-based baths with different concentrations of oxidant for a minute. The surface of the treated samples was analyzed by XPS and SEM-EDXS, while its corrosion resistance was investigated using electrochemical tests (EIS) conducted in a 0.05 M NaCl solution and the impedance spectra evolution analyzed as a function of the exposure time. The results showed a direct relationship between oxidant concentration and corrosion resistance. When the oxidant concentration rose from2mL.L-1 to 12mL.L-1, the corrosion resistance increased about 5 times, and this was attributed to the decrease in the Ce3+/Ce4+ relationship of the conversion film.
publishDate 2014
dc.date.none.fl_str_mv 2014
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/81358
url http://sedici.unlp.edu.ar/handle/10915/81358
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0974-7443
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-nd/4.0/
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
dc.format.none.fl_str_mv application/pdf
85-94
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
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repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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