Gamma phases in Cu-Al alloys and the influence of a square shaped phase in the electrochemical behavior of a Cu-13.6wt% Al alloy

Detalhes bibliográficos
Autor(a) principal: Hurtado, MRF
Data de Publicação: 1998
Outros Autores: Ferrer, J. C., Adorno, A. T., Sumodjo, PTA, Benedetti, Assis Vicente [UNESP]
Tipo de documento: Artigo de conferência
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: https://getinfo.de/app/Gamma-Phases-in-Cu-Al-Alloys-and-The-Influence/id/BLCP%3ACN025121560
http://hdl.handle.net/11449/38261
Resumo: The electrochemical behavior of Cu-xAl alloys, with 11 wt%less than or equal to x less than or equal to 15wt%, in 0.5 M H2SO4 was studied by means of open-circuit potential decay measurements, quasi-stationary and fast cyclic voltammetry, and electrochemical impedance spectroscopy. Some of the alloys (x less than or equal to 14%), when quenched formed martensitic structures. Alloys with greater than or equal to 13% showed a little square-shaped phase when quenched from temperatures around 800 degrees C. It was observed that in sulfuric medium, these formations were dealuminized differently than the martensitic phase. The values of the rest potentials are more influenced by the heat treatment rather than by the alloy composition. An anodic Tafel slope of ca. 60 mV/decade was observed for all the alloys, independently of the heat treatment. This is explained in terms of a competition between two processes: copper oxidation and copper(I) deproportionation. In the cyclic voltammetric experiments it was observed an anodic current peak, related with copper oxidation with a possible formation of some interfacial species, and a cathodic current peak during the reverse potential scan, associated with the reduction of soluble species and/or of the film. The AC Impedance data were interpreted in terms of electric equivalent circuits.
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spelling Gamma phases in Cu-Al alloys and the influence of a square shaped phase in the electrochemical behavior of a Cu-13.6wt% Al alloyThe electrochemical behavior of Cu-xAl alloys, with 11 wt%less than or equal to x less than or equal to 15wt%, in 0.5 M H2SO4 was studied by means of open-circuit potential decay measurements, quasi-stationary and fast cyclic voltammetry, and electrochemical impedance spectroscopy. Some of the alloys (x less than or equal to 14%), when quenched formed martensitic structures. Alloys with greater than or equal to 13% showed a little square-shaped phase when quenched from temperatures around 800 degrees C. It was observed that in sulfuric medium, these formations were dealuminized differently than the martensitic phase. The values of the rest potentials are more influenced by the heat treatment rather than by the alloy composition. An anodic Tafel slope of ca. 60 mV/decade was observed for all the alloys, independently of the heat treatment. This is explained in terms of a competition between two processes: copper oxidation and copper(I) deproportionation. In the cyclic voltammetric experiments it was observed an anodic current peak, related with copper oxidation with a possible formation of some interfacial species, and a cathodic current peak during the reverse potential scan, associated with the reduction of soluble species and/or of the film. The AC Impedance data were interpreted in terms of electric equivalent circuits.Univ Estadual Paulista, Inst Quim, BR-14801 Araraquara, SP, BrazilUniv Estadual Paulista, Inst Quim, BR-14801 Araraquara, SP, BrazilElectrochemical Society IncUniversidade Estadual Paulista (Unesp)Hurtado, MRFFerrer, J. C.Adorno, A. T.Sumodjo, PTABenedetti, Assis Vicente [UNESP]2014-05-20T15:28:28Z2014-05-20T15:28:28Z1998-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObject665-676https://getinfo.de/app/Gamma-Phases-in-Cu-Al-Alloys-and-The-Influence/id/BLCP%3ACN025121560Proceedings of the Symposium on Passivity and Its Breakdown. Pennington: Electrochemical Society Inc., v. 97, n. 26, p. 665-676, 1998.http://hdl.handle.net/11449/38261WOS:000076910000057Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengProceedings of the Symposium on Passivity and Its Breakdowninfo:eu-repo/semantics/openAccess2021-10-23T21:41:26Zoai:repositorio.unesp.br:11449/38261Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T20:41:50.668282Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Gamma phases in Cu-Al alloys and the influence of a square shaped phase in the electrochemical behavior of a Cu-13.6wt% Al alloy
title Gamma phases in Cu-Al alloys and the influence of a square shaped phase in the electrochemical behavior of a Cu-13.6wt% Al alloy
spellingShingle Gamma phases in Cu-Al alloys and the influence of a square shaped phase in the electrochemical behavior of a Cu-13.6wt% Al alloy
Hurtado, MRF
title_short Gamma phases in Cu-Al alloys and the influence of a square shaped phase in the electrochemical behavior of a Cu-13.6wt% Al alloy
title_full Gamma phases in Cu-Al alloys and the influence of a square shaped phase in the electrochemical behavior of a Cu-13.6wt% Al alloy
title_fullStr Gamma phases in Cu-Al alloys and the influence of a square shaped phase in the electrochemical behavior of a Cu-13.6wt% Al alloy
title_full_unstemmed Gamma phases in Cu-Al alloys and the influence of a square shaped phase in the electrochemical behavior of a Cu-13.6wt% Al alloy
title_sort Gamma phases in Cu-Al alloys and the influence of a square shaped phase in the electrochemical behavior of a Cu-13.6wt% Al alloy
author Hurtado, MRF
author_facet Hurtado, MRF
Ferrer, J. C.
Adorno, A. T.
Sumodjo, PTA
Benedetti, Assis Vicente [UNESP]
author_role author
author2 Ferrer, J. C.
Adorno, A. T.
Sumodjo, PTA
Benedetti, Assis Vicente [UNESP]
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Hurtado, MRF
Ferrer, J. C.
Adorno, A. T.
Sumodjo, PTA
Benedetti, Assis Vicente [UNESP]
description The electrochemical behavior of Cu-xAl alloys, with 11 wt%less than or equal to x less than or equal to 15wt%, in 0.5 M H2SO4 was studied by means of open-circuit potential decay measurements, quasi-stationary and fast cyclic voltammetry, and electrochemical impedance spectroscopy. Some of the alloys (x less than or equal to 14%), when quenched formed martensitic structures. Alloys with greater than or equal to 13% showed a little square-shaped phase when quenched from temperatures around 800 degrees C. It was observed that in sulfuric medium, these formations were dealuminized differently than the martensitic phase. The values of the rest potentials are more influenced by the heat treatment rather than by the alloy composition. An anodic Tafel slope of ca. 60 mV/decade was observed for all the alloys, independently of the heat treatment. This is explained in terms of a competition between two processes: copper oxidation and copper(I) deproportionation. In the cyclic voltammetric experiments it was observed an anodic current peak, related with copper oxidation with a possible formation of some interfacial species, and a cathodic current peak during the reverse potential scan, associated with the reduction of soluble species and/or of the film. The AC Impedance data were interpreted in terms of electric equivalent circuits.
publishDate 1998
dc.date.none.fl_str_mv 1998-01-01
2014-05-20T15:28:28Z
2014-05-20T15:28:28Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/conferenceObject
format conferenceObject
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://getinfo.de/app/Gamma-Phases-in-Cu-Al-Alloys-and-The-Influence/id/BLCP%3ACN025121560
Proceedings of the Symposium on Passivity and Its Breakdown. Pennington: Electrochemical Society Inc., v. 97, n. 26, p. 665-676, 1998.
http://hdl.handle.net/11449/38261
WOS:000076910000057
url https://getinfo.de/app/Gamma-Phases-in-Cu-Al-Alloys-and-The-Influence/id/BLCP%3ACN025121560
http://hdl.handle.net/11449/38261
identifier_str_mv Proceedings of the Symposium on Passivity and Its Breakdown. Pennington: Electrochemical Society Inc., v. 97, n. 26, p. 665-676, 1998.
WOS:000076910000057
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Proceedings of the Symposium on Passivity and Its Breakdown
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 665-676
dc.publisher.none.fl_str_mv Electrochemical Society Inc
publisher.none.fl_str_mv Electrochemical Society Inc
dc.source.none.fl_str_mv Web of Science
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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