Anti-Corrosion Performance of Cr+6-Free Passivating Layers Applied on Electrogalvanized

Autores
Tomachuk, C. R.; Di Sarli, Alejandro Ramón; Elsner, Cecilia Inés
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Hexavalent chromium-based passivation treatments have been successfully used as promoters of conversion coatings for many years. Their effectiveness is without question although there are many problems with regard to their environmental suitability. Hexavalent chromium compounds are carcinogenic and toxic. These problems have lead researchers to evaluate other potential systems, with lower toxicity, to ascertain if they can replace chromates as effective passivators. Researchers have proposed several alternative passivation treatments; these are processes based on molybdates, permanganates, titanates, rare earth metal and Cr3+ (considered to be non-carcinogenic) compounds. In this work, zinc coatings obtained from free-cyanide alkaline bath and submitted to a Cr3+ based passivation treatment with different colors were studied. The corrosion behavior was studied by polarization measurements and mainly by electrochemical impedance spectroscopy in 0.6 N NaCl solution. Morphological observations on the coatings surface were also performed. The results indicate that the green-colored Cr3+ passivated coatings have a good corrosion resistance followed by yellow and blue-colored passivation respectively. They could be a less polluting alternative to the traditional chromated coatings.
Centro de Investigación y Desarrollo en Tecnología de Pinturas
Materia
Química
Zinc
Conversion Treatment
Impedance Spectroscopy
Salt Spray
Corrosion
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:10915/81948

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network_name_str SEDICI (UNLP)
spelling Anti-Corrosion Performance of Cr+6-Free Passivating Layers Applied on ElectrogalvanizedTomachuk, C. R.Di Sarli, Alejandro RamónElsner, Cecilia InésQuímicaZincConversion TreatmentImpedance SpectroscopySalt SprayCorrosionHexavalent chromium-based passivation treatments have been successfully used as promoters of conversion coatings for many years. Their effectiveness is without question although there are many problems with regard to their environmental suitability. Hexavalent chromium compounds are carcinogenic and toxic. These problems have lead researchers to evaluate other potential systems, with lower toxicity, to ascertain if they can replace chromates as effective passivators. Researchers have proposed several alternative passivation treatments; these are processes based on molybdates, permanganates, titanates, rare earth metal and Cr3+ (considered to be non-carcinogenic) compounds. In this work, zinc coatings obtained from free-cyanide alkaline bath and submitted to a Cr3+ based passivation treatment with different colors were studied. The corrosion behavior was studied by polarization measurements and mainly by electrochemical impedance spectroscopy in 0.6 N NaCl solution. Morphological observations on the coatings surface were also performed. The results indicate that the green-colored Cr3+ passivated coatings have a good corrosion resistance followed by yellow and blue-colored passivation respectively. They could be a less polluting alternative to the traditional chromated coatings.Centro de Investigación y Desarrollo en Tecnología de Pinturas2010info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf202-209http://sedici.unlp.edu.ar/handle/10915/81948enginfo:eu-repo/semantics/altIdentifier/issn/2153-1188info:eu-repo/semantics/altIdentifier/doi/10.4236/msa.2010.14032info: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:UNLP2025-09-29T11:15:17Zoai:sedici.unlp.edu.ar:10915/81948Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:15:17.586SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Anti-Corrosion Performance of Cr+6-Free Passivating Layers Applied on Electrogalvanized
title Anti-Corrosion Performance of Cr+6-Free Passivating Layers Applied on Electrogalvanized
spellingShingle Anti-Corrosion Performance of Cr+6-Free Passivating Layers Applied on Electrogalvanized
Tomachuk, C. R.
Química
Zinc
Conversion Treatment
Impedance Spectroscopy
Salt Spray
Corrosion
title_short Anti-Corrosion Performance of Cr+6-Free Passivating Layers Applied on Electrogalvanized
title_full Anti-Corrosion Performance of Cr+6-Free Passivating Layers Applied on Electrogalvanized
title_fullStr Anti-Corrosion Performance of Cr+6-Free Passivating Layers Applied on Electrogalvanized
title_full_unstemmed Anti-Corrosion Performance of Cr+6-Free Passivating Layers Applied on Electrogalvanized
title_sort Anti-Corrosion Performance of Cr+6-Free Passivating Layers Applied on Electrogalvanized
dc.creator.none.fl_str_mv Tomachuk, C. R.
Di Sarli, Alejandro Ramón
Elsner, Cecilia Inés
author Tomachuk, C. R.
author_facet Tomachuk, C. R.
Di Sarli, Alejandro Ramón
Elsner, Cecilia Inés
author_role author
author2 Di Sarli, Alejandro Ramón
Elsner, Cecilia Inés
author2_role author
author
dc.subject.none.fl_str_mv Química
Zinc
Conversion Treatment
Impedance Spectroscopy
Salt Spray
Corrosion
topic Química
Zinc
Conversion Treatment
Impedance Spectroscopy
Salt Spray
Corrosion
dc.description.none.fl_txt_mv Hexavalent chromium-based passivation treatments have been successfully used as promoters of conversion coatings for many years. Their effectiveness is without question although there are many problems with regard to their environmental suitability. Hexavalent chromium compounds are carcinogenic and toxic. These problems have lead researchers to evaluate other potential systems, with lower toxicity, to ascertain if they can replace chromates as effective passivators. Researchers have proposed several alternative passivation treatments; these are processes based on molybdates, permanganates, titanates, rare earth metal and Cr3+ (considered to be non-carcinogenic) compounds. In this work, zinc coatings obtained from free-cyanide alkaline bath and submitted to a Cr3+ based passivation treatment with different colors were studied. The corrosion behavior was studied by polarization measurements and mainly by electrochemical impedance spectroscopy in 0.6 N NaCl solution. Morphological observations on the coatings surface were also performed. The results indicate that the green-colored Cr3+ passivated coatings have a good corrosion resistance followed by yellow and blue-colored passivation respectively. They could be a less polluting alternative to the traditional chromated coatings.
Centro de Investigación y Desarrollo en Tecnología de Pinturas
description Hexavalent chromium-based passivation treatments have been successfully used as promoters of conversion coatings for many years. Their effectiveness is without question although there are many problems with regard to their environmental suitability. Hexavalent chromium compounds are carcinogenic and toxic. These problems have lead researchers to evaluate other potential systems, with lower toxicity, to ascertain if they can replace chromates as effective passivators. Researchers have proposed several alternative passivation treatments; these are processes based on molybdates, permanganates, titanates, rare earth metal and Cr3+ (considered to be non-carcinogenic) compounds. In this work, zinc coatings obtained from free-cyanide alkaline bath and submitted to a Cr3+ based passivation treatment with different colors were studied. The corrosion behavior was studied by polarization measurements and mainly by electrochemical impedance spectroscopy in 0.6 N NaCl solution. Morphological observations on the coatings surface were also performed. The results indicate that the green-colored Cr3+ passivated coatings have a good corrosion resistance followed by yellow and blue-colored passivation respectively. They could be a less polluting alternative to the traditional chromated coatings.
publishDate 2010
dc.date.none.fl_str_mv 2010
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/10915/81948
url http://sedici.unlp.edu.ar/handle/10915/81948
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/2153-1188
info:eu-repo/semantics/altIdentifier/doi/10.4236/msa.2010.14032
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
202-209
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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