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

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...

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Autores principales: Tomachuk, C. R., Di Sarli, Alejandro Ramón, Elsner, Cecilia Inés
Formato: Articulo
Lenguaje:Inglés
Publicado: 2010
Materias:
Química
Zinc
Conversion Treatment
Impedance Spectroscopy
Salt Spray
Corrosion
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/81948
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-81948
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Zinc
Conversion Treatment
Impedance Spectroscopy
Salt Spray
Corrosion
spellingShingle Química
Zinc
Conversion Treatment
Impedance Spectroscopy
Salt Spray
Corrosion
Tomachuk, C. R.
Di Sarli, Alejandro Ramón
Elsner, Cecilia Inés
Anti-Corrosion Performance of Cr+6-Free Passivating Layers Applied on Electrogalvanized
topic_facet Química
Zinc
Conversion Treatment
Impedance Spectroscopy
Salt Spray
Corrosion
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.
format Articulo
Articulo
author Tomachuk, C. R.
Di Sarli, Alejandro Ramón
Elsner, Cecilia Inés
author_facet Tomachuk, C. R.
Di Sarli, Alejandro Ramón
Elsner, Cecilia Inés
author_sort Tomachuk, C. R.
title Anti-Corrosion Performance of Cr+6-Free Passivating Layers Applied on Electrogalvanized
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
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/81948
work_keys_str_mv AT tomachukcr anticorrosionperformanceofcr6freepassivatinglayersappliedonelectrogalvanized
AT disarlialejandroramon anticorrosionperformanceofcr6freepassivatinglayersappliedonelectrogalvanized
AT elsnerceciliaines anticorrosionperformanceofcr6freepassivatinglayersappliedonelectrogalvanized
bdutipo_str Repositorios
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