Electrochemical behaviour of copper in aqueous moderate alkaline media, containing sodium carbonate and bicarbonate, and sodium perchlorate

The voltammetric polarization of Cu specimens in Na<sub>2</sub>CO<sub>3</sub>, NaHCO<sub>3</sub> and NaClO4 solutions (8-12pH range) has been investigated. Voltammetry data were complemented with SEM and electron microprobe analysis. Results are found to be in agr...

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Detalles Bibliográficos
Autores: Pérez Sánchez, M., Barrera, M., González, Sergio G., Souto, Ricardo M., Salvarezza, Roberto Carlos, Arvia, Alejandro Jorge
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:1990
País:Argentina
Institución:Universidad Nacional de La Plata
Repositorio:SEDICI (UNLP)
Idioma:inglés
OAI Identifier:oai:sedici.unlp.edu.ar:10915/81230
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/81230
Access Level:acceso abierto
Palabra clave:Ciencias Exactas
Química
Electroquímica
Cobre
Carbonato de Sodio
voltammetry
Metales Alcalinos
scanning electron microscopy
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spelling Electrochemical behaviour of copper in aqueous moderate alkaline media, containing sodium carbonate and bicarbonate, and sodium perchloratePérez Sánchez, M.Barrera, M.González, Sergio G.Souto, Ricardo M.Salvarezza, Roberto CarlosArvia, Alejandro JorgeCiencias ExactasQuímicaElectroquímicaCobreCarbonato de SodiovoltammetryMetales Alcalinosscanning electron microscopyThe voltammetric polarization of Cu specimens in Na<sub>2</sub>CO<sub>3</sub>, NaHCO<sub>3</sub> and NaClO4 solutions (8-12pH range) has been investigated. Voltammetry data were complemented with SEM and electron microprobe analysis. Results are found to be in agreement with the passivation model developed for Cu in plain NaOH solutions. For the latter the process can be described in terms of two steps, namely, at low potentials the initial formation of a Cu<sub>2</sub>O thin layer followed by the growth of a massive Cu<sub>2</sub>O layer, and at higher potentials the appearance of a CuO-Cu(OH)<sub>2</sub> layer. These processes are accompanied by the formation of soluble Cu species. Beyond a certain potential which increases with the solution pH, copper pitting takes place. This model can be extended to Cu in carbonate/bicarbonate containing solutions by considering that Cu carbonates precipitate as long as soluble ionic Cu species are produced, without interfering appreciably with the formation of Cu oxides. The appearance of copper carbonate species is enhanced when pitting corrosion sets in. The precipitation of Cu carbonates occurs principally around pits. Cu pitting, although it is observed for all solutions, becomes more noticeable at the lowest pH values. At a constant pH, the density of pits increases in the order NaClO<sub>4</sub> > NaHCO<sub>3</sub> > Na<sub>2</sub>CO<sub>3</sub>. The influence of the electrolyte composition on Cu pitting is closely related to the blockage capability for pit nucleation and growth of the corresponding copper salts. Passivation in the Cu<sub>2</sub>O-Cu(OH)<sub>2</sub> region hinders pitting corrosion.Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)Facultad de Ciencias Exactas1990info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf1337-1343http://sedici.unlp.edu.ar/handle/10915/81230enginfo:eu-repo/semantics/altIdentifier/issn/0013-4686info:eu-repo/semantics/altIdentifier/doi/10.1016/0013-4686(90)85004-7info: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:UNLP2024-05-08T12:53:16Zoai:sedici.unlp.edu.ar:10915/81230Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292024-05-08 12:53:16.776SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Electrochemical behaviour of copper in aqueous moderate alkaline media, containing sodium carbonate and bicarbonate, and sodium perchlorate
title Electrochemical behaviour of copper in aqueous moderate alkaline media, containing sodium carbonate and bicarbonate, and sodium perchlorate
spellingShingle Electrochemical behaviour of copper in aqueous moderate alkaline media, containing sodium carbonate and bicarbonate, and sodium perchlorate
Pérez Sánchez, M.
Ciencias Exactas
Química
Electroquímica
Cobre
Carbonato de Sodio
voltammetry
Metales Alcalinos
scanning electron microscopy
title_short Electrochemical behaviour of copper in aqueous moderate alkaline media, containing sodium carbonate and bicarbonate, and sodium perchlorate
title_full Electrochemical behaviour of copper in aqueous moderate alkaline media, containing sodium carbonate and bicarbonate, and sodium perchlorate
title_fullStr Electrochemical behaviour of copper in aqueous moderate alkaline media, containing sodium carbonate and bicarbonate, and sodium perchlorate
title_full_unstemmed Electrochemical behaviour of copper in aqueous moderate alkaline media, containing sodium carbonate and bicarbonate, and sodium perchlorate
title_sort Electrochemical behaviour of copper in aqueous moderate alkaline media, containing sodium carbonate and bicarbonate, and sodium perchlorate
dc.creator.none.fl_str_mv Pérez Sánchez, M.
Barrera, M.
González, Sergio G.
Souto, Ricardo M.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author Pérez Sánchez, M.
author_facet Pérez Sánchez, M.
Barrera, M.
González, Sergio G.
Souto, Ricardo M.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_role author
author2 Barrera, M.
González, Sergio G.
Souto, Ricardo M.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias Exactas
Química
Electroquímica
Cobre
Carbonato de Sodio
voltammetry
Metales Alcalinos
scanning electron microscopy
topic Ciencias Exactas
Química
Electroquímica
Cobre
Carbonato de Sodio
voltammetry
Metales Alcalinos
scanning electron microscopy
description The voltammetric polarization of Cu specimens in Na<sub>2</sub>CO<sub>3</sub>, NaHCO<sub>3</sub> and NaClO4 solutions (8-12pH range) has been investigated. Voltammetry data were complemented with SEM and electron microprobe analysis. Results are found to be in agreement with the passivation model developed for Cu in plain NaOH solutions. For the latter the process can be described in terms of two steps, namely, at low potentials the initial formation of a Cu<sub>2</sub>O thin layer followed by the growth of a massive Cu<sub>2</sub>O layer, and at higher potentials the appearance of a CuO-Cu(OH)<sub>2</sub> layer. These processes are accompanied by the formation of soluble Cu species. Beyond a certain potential which increases with the solution pH, copper pitting takes place. This model can be extended to Cu in carbonate/bicarbonate containing solutions by considering that Cu carbonates precipitate as long as soluble ionic Cu species are produced, without interfering appreciably with the formation of Cu oxides. The appearance of copper carbonate species is enhanced when pitting corrosion sets in. The precipitation of Cu carbonates occurs principally around pits. Cu pitting, although it is observed for all solutions, becomes more noticeable at the lowest pH values. At a constant pH, the density of pits increases in the order NaClO<sub>4</sub> > NaHCO<sub>3</sub> > Na<sub>2</sub>CO<sub>3</sub>. The influence of the electrolyte composition on Cu pitting is closely related to the blockage capability for pit nucleation and growth of the corresponding copper salts. Passivation in the Cu<sub>2</sub>O-Cu(OH)<sub>2</sub> region hinders pitting corrosion.
publishDate 1990
dc.date.none.fl_str_mv 1990
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/81230
url http://sedici.unlp.edu.ar/handle/10915/81230
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0013-4686
info:eu-repo/semantics/altIdentifier/doi/10.1016/0013-4686(90)85004-7
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
1337-1343
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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