A Conversion Layer Based on Trivalent Chromium and Cobalt for the Corrosion Protection of Electrogalvanized Steel

The corrosion resistance of pure zinc coatings can be improved through the application of suitable chemical passivation treatments. Hexavalent chromium (Cr6+) compounds have widely been used to formulate conversion layers providing better anticorrosive protection as well as anchorage properties to p...

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Autores principales: Di Sarli, Alejandro Ramón, Culcasi, José Daniel, Tomachuk, C. R., Elsner, Cecilia Inés, Ferreira Jr., J. M., Costa, Isolda
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Ingeniería Química
Corrosion
Electrochemical properties
Coatings
SEM
EDXS
XPS
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82174
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82174
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ingeniería Química
Corrosion
Electrochemical properties
Coatings
SEM
EDXS
XPS
spellingShingle Ingeniería Química
Corrosion
Electrochemical properties
Coatings
SEM
EDXS
XPS
Di Sarli, Alejandro Ramón
Culcasi, José Daniel
Tomachuk, C. R.
Elsner, Cecilia Inés
Ferreira Jr., J. M.
Costa, Isolda
A Conversion Layer Based on Trivalent Chromium and Cobalt for the Corrosion Protection of Electrogalvanized Steel
topic_facet Ingeniería Química
Corrosion
Electrochemical properties
Coatings
SEM
EDXS
XPS
description The corrosion resistance of pure zinc coatings can be improved through the application of suitable chemical passivation treatments. Hexavalent chromium (Cr6+) compounds have widely been used to formulate conversion layers providing better anticorrosive protection as well as anchorage properties to painting systems. However, taking into account that they are produced using hazardous chemical compounds, the development of alternative and “green” technologies with equivalent protective performance is a paramount purpose of many R&D laboratories working around the world. In the present paper, the corrosion behavior of industrially electrogalvanized steel subjected to a Cr3+ + Co2+-based passivation treatment was studied. The experimental work involved electrochemical impedance spectroscopy (EIS)measurements and polarization curves in a 0.1 mol/L Na2SO4 solution, surface microstructural and morphological characterization by electronic microscopy as well as chemical analysis by EDXS and XPS. The most commonly observed failures on the Cr6+ treated sampleswere attributed to microstructural features of the substrate that were not adequately healed by the Cr6+ passivation treatment.
format Articulo
Articulo
author Di Sarli, Alejandro Ramón
Culcasi, José Daniel
Tomachuk, C. R.
Elsner, Cecilia Inés
Ferreira Jr., J. M.
Costa, Isolda
author_facet Di Sarli, Alejandro Ramón
Culcasi, José Daniel
Tomachuk, C. R.
Elsner, Cecilia Inés
Ferreira Jr., J. M.
Costa, Isolda
author_sort Di Sarli, Alejandro Ramón
title A Conversion Layer Based on Trivalent Chromium and Cobalt for the Corrosion Protection of Electrogalvanized Steel
title_short A Conversion Layer Based on Trivalent Chromium and Cobalt for the Corrosion Protection of Electrogalvanized Steel
title_full A Conversion Layer Based on Trivalent Chromium and Cobalt for the Corrosion Protection of Electrogalvanized Steel
title_fullStr A Conversion Layer Based on Trivalent Chromium and Cobalt for the Corrosion Protection of Electrogalvanized Steel
title_full_unstemmed A Conversion Layer Based on Trivalent Chromium and Cobalt for the Corrosion Protection of Electrogalvanized Steel
title_sort conversion layer based on trivalent chromium and cobalt for the corrosion protection of electrogalvanized steel
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/82174
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