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
Autor(a) principal: | |
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Data de Publicação: | 1998 |
Outros Autores: | , , , |
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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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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1808129235444826112 |