Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel
- Autores
- Culcasi, José Daniel; Elsner, Cecilia Inés; Di Sarli, Alejandro Ramón; Palomino, Luis; Tomachuk, C. R.; Costas, Isolda
- Año de publicación
- 2014
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Ce-based conversion films have been assessed as alternatives for replacement of Cr6+-based films,which have been forbidden for their toxicity and carcinogenic properties. However, corrosion protection associated with chromate films is difficult to achieve by other surface treatments. Experimental results have revealed that to obtain the highly satisfactory results provided by chromate-based conversion coatings, it is necessary to improve the anticorrosive properties of the new chromium-free coatings. The present work deals with the effect of the oxidant concentration in the cerium-based conversion baths on the corrosion resistance of the films deposited on galvanized steel. Electrogalvanized steel sheets were exposed to cerium chloride-based baths with different concentrations of oxidant for a minute. The surface of the treated samples was analyzed by XPS and SEM-EDXS, while its corrosion resistance was investigated using electrochemical tests (EIS) conducted in a 0.05 M NaCl solution and the impedance spectra evolution analyzed as a function of the exposure time. The results showed a direct relationship between oxidant concentration and corrosion resistance. When the oxidant concentration rose from2mL.L-1 to 12mL.L-1, the corrosion resistance increased about 5 times, and this was attributed to the decrease in the Ce3+/Ce4+ relationship of the conversion film.
Centro de Investigación y Desarrollo en Tecnología de Pinturas (CIDEPINT) - Materia
-
Ingeniería
Galvanized steel
Ce-based conversion films
Corrosion
EIS
SEM
EDXS
XPS - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-nd/4.0/
- Repositorio
.jpg)
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/81358
Ver los metadatos del registro completo
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Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized SteelCulcasi, José DanielElsner, Cecilia InésDi Sarli, Alejandro RamónPalomino, LuisTomachuk, C. R.Costas, IsoldaIngenieríaGalvanized steelCe-based conversion filmsCorrosionEISSEMEDXSXPSCe-based conversion films have been assessed as alternatives for replacement of Cr6+-based films,which have been forbidden for their toxicity and carcinogenic properties. However, corrosion protection associated with chromate films is difficult to achieve by other surface treatments. Experimental results have revealed that to obtain the highly satisfactory results provided by chromate-based conversion coatings, it is necessary to improve the anticorrosive properties of the new chromium-free coatings. The present work deals with the effect of the oxidant concentration in the cerium-based conversion baths on the corrosion resistance of the films deposited on galvanized steel. Electrogalvanized steel sheets were exposed to cerium chloride-based baths with different concentrations of oxidant for a minute. The surface of the treated samples was analyzed by XPS and SEM-EDXS, while its corrosion resistance was investigated using electrochemical tests (EIS) conducted in a 0.05 M NaCl solution and the impedance spectra evolution analyzed as a function of the exposure time. The results showed a direct relationship between oxidant concentration and corrosion resistance. When the oxidant concentration rose from2mL.L-1 to 12mL.L-1, the corrosion resistance increased about 5 times, and this was attributed to the decrease in the Ce3+/Ce4+ relationship of the conversion film.Centro de Investigación y Desarrollo en Tecnología de Pinturas (CIDEPINT)2014info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf85-94http://sedici.unlp.edu.ar/handle/10915/81358enginfo:eu-repo/semantics/altIdentifier/issn/0974-7443info: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:UNLP2025-10-22T16:55:56Zoai:sedici.unlp.edu.ar:10915/81358Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-22 16:55:56.701SEDICI (UNLP) - Universidad Nacional de La Platafalse |
| dc.title.none.fl_str_mv |
Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel |
| title |
Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel |
| spellingShingle |
Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel Culcasi, José Daniel Ingeniería Galvanized steel Ce-based conversion films Corrosion EIS SEM EDXS XPS |
| title_short |
Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel |
| title_full |
Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel |
| title_fullStr |
Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel |
| title_full_unstemmed |
Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel |
| title_sort |
Effect of Oxidizing Concentration on the Corrosion Resistance of the Cerium Conversion Coatings on Galvanized Steel |
| dc.creator.none.fl_str_mv |
Culcasi, José Daniel Elsner, Cecilia Inés Di Sarli, Alejandro Ramón Palomino, Luis Tomachuk, C. R. Costas, Isolda |
| author |
Culcasi, José Daniel |
| author_facet |
Culcasi, José Daniel Elsner, Cecilia Inés Di Sarli, Alejandro Ramón Palomino, Luis Tomachuk, C. R. Costas, Isolda |
| author_role |
author |
| author2 |
Elsner, Cecilia Inés Di Sarli, Alejandro Ramón Palomino, Luis Tomachuk, C. R. Costas, Isolda |
| author2_role |
author author author author author |
| dc.subject.none.fl_str_mv |
Ingeniería Galvanized steel Ce-based conversion films Corrosion EIS SEM EDXS XPS |
| topic |
Ingeniería Galvanized steel Ce-based conversion films Corrosion EIS SEM EDXS XPS |
| dc.description.none.fl_txt_mv |
Ce-based conversion films have been assessed as alternatives for replacement of Cr6+-based films,which have been forbidden for their toxicity and carcinogenic properties. However, corrosion protection associated with chromate films is difficult to achieve by other surface treatments. Experimental results have revealed that to obtain the highly satisfactory results provided by chromate-based conversion coatings, it is necessary to improve the anticorrosive properties of the new chromium-free coatings. The present work deals with the effect of the oxidant concentration in the cerium-based conversion baths on the corrosion resistance of the films deposited on galvanized steel. Electrogalvanized steel sheets were exposed to cerium chloride-based baths with different concentrations of oxidant for a minute. The surface of the treated samples was analyzed by XPS and SEM-EDXS, while its corrosion resistance was investigated using electrochemical tests (EIS) conducted in a 0.05 M NaCl solution and the impedance spectra evolution analyzed as a function of the exposure time. The results showed a direct relationship between oxidant concentration and corrosion resistance. When the oxidant concentration rose from2mL.L-1 to 12mL.L-1, the corrosion resistance increased about 5 times, and this was attributed to the decrease in the Ce3+/Ce4+ relationship of the conversion film. Centro de Investigación y Desarrollo en Tecnología de Pinturas (CIDEPINT) |
| description |
Ce-based conversion films have been assessed as alternatives for replacement of Cr6+-based films,which have been forbidden for their toxicity and carcinogenic properties. However, corrosion protection associated with chromate films is difficult to achieve by other surface treatments. Experimental results have revealed that to obtain the highly satisfactory results provided by chromate-based conversion coatings, it is necessary to improve the anticorrosive properties of the new chromium-free coatings. The present work deals with the effect of the oxidant concentration in the cerium-based conversion baths on the corrosion resistance of the films deposited on galvanized steel. Electrogalvanized steel sheets were exposed to cerium chloride-based baths with different concentrations of oxidant for a minute. The surface of the treated samples was analyzed by XPS and SEM-EDXS, while its corrosion resistance was investigated using electrochemical tests (EIS) conducted in a 0.05 M NaCl solution and the impedance spectra evolution analyzed as a function of the exposure time. The results showed a direct relationship between oxidant concentration and corrosion resistance. When the oxidant concentration rose from2mL.L-1 to 12mL.L-1, the corrosion resistance increased about 5 times, and this was attributed to the decrease in the Ce3+/Ce4+ relationship of the conversion film. |
| publishDate |
2014 |
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2014 |
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eng |
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