Trivalent chromium conversion layer: a way of enchancing the electrogalvanized steel corrosion protection

Conversion coatings are used on galvanized steels to provide corrosion protection and for special applications are covered with an additional organic or inorganic topcoat. Hexavalent chromium-based passivation treatments have been successfully used as conversion coatings; however, as it is heavily t...

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Detalles Bibliográficos
Autores principales:	Tomachuk, C., Elsner, Cecilia Inés, Di Sarli, Alejandro Ramón, Culcasi, José Daniel, Costa, I.
Formato:	Objeto de conferencia Resumen
Lenguaje:	Inglés
Publicado:	2010
Materias:	Química Trivalent chromium Hexavalent chromium Electrogalvanized steel Conversion treatment
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/119099
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-119099
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Química Trivalent chromium Hexavalent chromium Electrogalvanized steel Conversion treatment
spellingShingle	Química Trivalent chromium Hexavalent chromium Electrogalvanized steel Conversion treatment Tomachuk, C. Elsner, Cecilia Inés Di Sarli, Alejandro Ramón Culcasi, José Daniel Costa, I. Trivalent chromium conversion layer: a way of enchancing the electrogalvanized steel corrosion protection
topic_facet	Química Trivalent chromium Hexavalent chromium Electrogalvanized steel Conversion treatment
description	Conversion coatings are used on galvanized steels to provide corrosion protection and for special applications are covered with an additional organic or inorganic topcoat. Hexavalent chromium-based passivation treatments have been successfully used as conversion coatings; however, as it is heavily toxic and carcinogenic, national and international environmental regulations impose its removal. From encouraging research works, less toxic alternative coatings have been recently proposed. Among promising alternatives, the environmentally friendly trivalent chromium-based conversion coating is one of the most studied. It decreases health hazards from airborne chromium and reduces the costs of waste treatment and final disposal, as the process needs low metal concentration and does not use hexavalent chromium or additives with strong oxidants. The present work aims to evaluate the corrosion behavior of electrogalvanized steel panels passivated with a trivalent chromium-based layer in 0.5 M NaCl solution. For this, electrochemical impedance spectroscopy (EIS) and morphological observations (SEM/EDAX and XPS) were carried out. The conversion treatments studied were based on: (i) Cr3+ (ZBLU); (ii) Cr3+ and Co ions (ZGREEN); and (iii) Cr3+, fluorzirconate ions and SiO2 (ZCOAT). An hexavalent chromium passivation layer (ZHEX) obtained under the same conditions adopted for the other treatments was used as reference. The results suggest that the corrosion protection supplied by ZCOAT is similar to the ZHEX, and it was followed by ZGREEN and ZBLU, respectively. Therefore, ZCOAT is a promising alternative to the traditional chromated coating.
format	Objeto de conferencia Resumen
author	Tomachuk, C. Elsner, Cecilia Inés Di Sarli, Alejandro Ramón Culcasi, José Daniel Costa, I.
author_facet	Tomachuk, C. Elsner, Cecilia Inés Di Sarli, Alejandro Ramón Culcasi, José Daniel Costa, I.
author_sort	Tomachuk, C.
title	Trivalent chromium conversion layer: a way of enchancing the electrogalvanized steel corrosion protection
title_short	Trivalent chromium conversion layer: a way of enchancing the electrogalvanized steel corrosion protection
title_full	Trivalent chromium conversion layer: a way of enchancing the electrogalvanized steel corrosion protection
title_fullStr	Trivalent chromium conversion layer: a way of enchancing the electrogalvanized steel corrosion protection
title_full_unstemmed	Trivalent chromium conversion layer: a way of enchancing the electrogalvanized steel corrosion protection
title_sort	trivalent chromium conversion layer: a way of enchancing the electrogalvanized steel corrosion protection
publishDate	2010
url	http://sedici.unlp.edu.ar/handle/10915/119099
work_keys_str_mv	AT tomachukc trivalentchromiumconversionlayerawayofenchancingtheelectrogalvanizedsteelcorrosionprotection AT elsnerceciliaines trivalentchromiumconversionlayerawayofenchancingtheelectrogalvanizedsteelcorrosionprotection AT disarlialejandroramon trivalentchromiumconversionlayerawayofenchancingtheelectrogalvanizedsteelcorrosionprotection AT culcasijosedaniel trivalentchromiumconversionlayerawayofenchancingtheelectrogalvanizedsteelcorrosionprotection AT costai trivalentchromiumconversionlayerawayofenchancingtheelectrogalvanizedsteelcorrosionprotection
bdutipo_str	Repositorios
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Trivalent chromium conversion layer: a way of enchancing the electrogalvanized steel corrosion protection

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