Effect of Cr III passivation on the corrosion resistance of coated electrogalvanized steel

Autores
Queiroz, F. M.; Elsner, Cecilia Inés; Di Sarli, Alejandro Ramón; Tomachuk, C.; Costa, I.
Año de publicación
2011
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Electrogalvanized steel surfaces are usually passivated for corrosion protection. Many of the passivation processes involve the use of hexavalent chromium (yellow chromating) that is being increasingly banished due to its toxic and carcinogenic effects. The search of alternative treatments for replacement of the yellow chromating has been the aim of many research carried out in the last decades. Among the proposed surface treatments, those based on Cr III solutions have been related to the highest compatibility to the Cr VI based ones. The present study evaluates the corrosion resistance of electrogalvanized steel passivated in Cr III or Cr VI based solutions and compares the effects of these two types of passivation treatments for samples with organic coating on top of the passivating surface film. Galvanizing of steel samples was carried out in an alkaline cyanide free zinc solution. Next, the electrogalvanized steel samples were passivated, either in a Cr III or a Cr VI based solutions, and then covered with an organic coating formulated specifically for this investigation. The electrochemical behavior of the prepared samples was monitored as a function of immersion time by electrochemical impedance spectroscopy (EIS) in a 0.05 mol L-1 sodium chloride solution, as Figure 1 illustrates. The results show that although higher impedances were associated to the Cr VI based treatments along the test period (4 days), it largely decreased between the first hours and 1 day of immersion, and remained fairly stable for longer periods. For the Cr III passivated samples, however, the impedance continuously increased with time of immersion, due to sealing of the defects in the passive film with zinc products.
Centro de Investigación y Desarrollo en Tecnología de Pinturas
Materia
Química
Acero
Corrosión
Protección
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/119315

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spelling Effect of Cr III passivation on the corrosion resistance of coated electrogalvanized steelQueiroz, F. M.Elsner, Cecilia InésDi Sarli, Alejandro RamónTomachuk, C.Costa, I.QuímicaAceroCorrosiónProtecciónElectrogalvanized steel surfaces are usually passivated for corrosion protection. Many of the passivation processes involve the use of hexavalent chromium (yellow chromating) that is being increasingly banished due to its toxic and carcinogenic effects. The search of alternative treatments for replacement of the yellow chromating has been the aim of many research carried out in the last decades. Among the proposed surface treatments, those based on Cr III solutions have been related to the highest compatibility to the Cr VI based ones. The present study evaluates the corrosion resistance of electrogalvanized steel passivated in Cr III or Cr VI based solutions and compares the effects of these two types of passivation treatments for samples with organic coating on top of the passivating surface film. Galvanizing of steel samples was carried out in an alkaline cyanide free zinc solution. Next, the electrogalvanized steel samples were passivated, either in a Cr III or a Cr VI based solutions, and then covered with an organic coating formulated specifically for this investigation. The electrochemical behavior of the prepared samples was monitored as a function of immersion time by electrochemical impedance spectroscopy (EIS) in a 0.05 mol L-1 sodium chloride solution, as Figure 1 illustrates. The results show that although higher impedances were associated to the Cr VI based treatments along the test period (4 days), it largely decreased between the first hours and 1 day of immersion, and remained fairly stable for longer periods. For the Cr III passivated samples, however, the impedance continuously increased with time of immersion, due to sealing of the defects in the passive film with zinc products.Centro de Investigación y Desarrollo en Tecnología de Pinturas2011-04-10info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionResumenhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/119315enginfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:28:09Zoai:sedici.unlp.edu.ar:10915/119315Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:28:09.835SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Effect of Cr III passivation on the corrosion resistance of coated electrogalvanized steel
title Effect of Cr III passivation on the corrosion resistance of coated electrogalvanized steel
spellingShingle Effect of Cr III passivation on the corrosion resistance of coated electrogalvanized steel
Queiroz, F. M.
Química
Acero
Corrosión
Protección
title_short Effect of Cr III passivation on the corrosion resistance of coated electrogalvanized steel
title_full Effect of Cr III passivation on the corrosion resistance of coated electrogalvanized steel
title_fullStr Effect of Cr III passivation on the corrosion resistance of coated electrogalvanized steel
title_full_unstemmed Effect of Cr III passivation on the corrosion resistance of coated electrogalvanized steel
title_sort Effect of Cr III passivation on the corrosion resistance of coated electrogalvanized steel
dc.creator.none.fl_str_mv Queiroz, F. M.
Elsner, Cecilia Inés
Di Sarli, Alejandro Ramón
Tomachuk, C.
Costa, I.
author Queiroz, F. M.
author_facet Queiroz, F. M.
Elsner, Cecilia Inés
Di Sarli, Alejandro Ramón
Tomachuk, C.
Costa, I.
author_role author
author2 Elsner, Cecilia Inés
Di Sarli, Alejandro Ramón
Tomachuk, C.
Costa, I.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Química
Acero
Corrosión
Protección
topic Química
Acero
Corrosión
Protección
dc.description.none.fl_txt_mv Electrogalvanized steel surfaces are usually passivated for corrosion protection. Many of the passivation processes involve the use of hexavalent chromium (yellow chromating) that is being increasingly banished due to its toxic and carcinogenic effects. The search of alternative treatments for replacement of the yellow chromating has been the aim of many research carried out in the last decades. Among the proposed surface treatments, those based on Cr III solutions have been related to the highest compatibility to the Cr VI based ones. The present study evaluates the corrosion resistance of electrogalvanized steel passivated in Cr III or Cr VI based solutions and compares the effects of these two types of passivation treatments for samples with organic coating on top of the passivating surface film. Galvanizing of steel samples was carried out in an alkaline cyanide free zinc solution. Next, the electrogalvanized steel samples were passivated, either in a Cr III or a Cr VI based solutions, and then covered with an organic coating formulated specifically for this investigation. The electrochemical behavior of the prepared samples was monitored as a function of immersion time by electrochemical impedance spectroscopy (EIS) in a 0.05 mol L-1 sodium chloride solution, as Figure 1 illustrates. The results show that although higher impedances were associated to the Cr VI based treatments along the test period (4 days), it largely decreased between the first hours and 1 day of immersion, and remained fairly stable for longer periods. For the Cr III passivated samples, however, the impedance continuously increased with time of immersion, due to sealing of the defects in the passive film with zinc products.
Centro de Investigación y Desarrollo en Tecnología de Pinturas
description Electrogalvanized steel surfaces are usually passivated for corrosion protection. Many of the passivation processes involve the use of hexavalent chromium (yellow chromating) that is being increasingly banished due to its toxic and carcinogenic effects. The search of alternative treatments for replacement of the yellow chromating has been the aim of many research carried out in the last decades. Among the proposed surface treatments, those based on Cr III solutions have been related to the highest compatibility to the Cr VI based ones. The present study evaluates the corrosion resistance of electrogalvanized steel passivated in Cr III or Cr VI based solutions and compares the effects of these two types of passivation treatments for samples with organic coating on top of the passivating surface film. Galvanizing of steel samples was carried out in an alkaline cyanide free zinc solution. Next, the electrogalvanized steel samples were passivated, either in a Cr III or a Cr VI based solutions, and then covered with an organic coating formulated specifically for this investigation. The electrochemical behavior of the prepared samples was monitored as a function of immersion time by electrochemical impedance spectroscopy (EIS) in a 0.05 mol L-1 sodium chloride solution, as Figure 1 illustrates. The results show that although higher impedances were associated to the Cr VI based treatments along the test period (4 days), it largely decreased between the first hours and 1 day of immersion, and remained fairly stable for longer periods. For the Cr III passivated samples, however, the impedance continuously increased with time of immersion, due to sealing of the defects in the passive film with zinc products.
publishDate 2011
dc.date.none.fl_str_mv 2011-04-10
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rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
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