Kinetics and Mechanism of β-Brass Dealloying in Aqueous 0.5 M Sodium Chloride Solution Derived from Combined Scanning Tunneling Microscopy and Electrochemical Data

Scanning tunneling microscopy (STM) combined with conventional electrochemical techniques was used to determine the kinetics and mechanism of β-brass dealloying in aqueous neutral solutions containing NaCl. In the potential range where selective dissolution of Zn occurs, electrochemical data suggest...

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Detalles Bibliográficos
Autores principales: Morales, J., Esparza, P., González, S., Vázquez, L., Salvarezza, Roberto Carlos, Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1996
Materias:
Ciencias Exactas
Química
Scanning tunneling microscopy
β-Brass Dealloying
Electrochemical Data
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/121479
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-121479
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Química
Scanning tunneling microscopy
β-Brass Dealloying
Electrochemical Data
spellingShingle Ciencias Exactas
Química
Scanning tunneling microscopy
β-Brass Dealloying
Electrochemical Data
Morales, J.
Esparza, P.
González, S.
Vázquez, L.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
Kinetics and Mechanism of β-Brass Dealloying in Aqueous 0.5 M Sodium Chloride Solution Derived from Combined Scanning Tunneling Microscopy and Electrochemical Data
topic_facet Ciencias Exactas
Química
Scanning tunneling microscopy
β-Brass Dealloying
Electrochemical Data
description Scanning tunneling microscopy (STM) combined with conventional electrochemical techniques was used to determine the kinetics and mechanism of β-brass dealloying in aqueous neutral solutions containing NaCl. In the potential range where selective dissolution of Zn occurs, electrochemical data suggest that the corrosion process is controlled by surface diffusion of Cu atoms. STM imaging of β-brass after dealloying shows the development of an irregular surface which attains a stationary regime. The irregular surface topography consists of faceted islands with atomically smooth terraces. For a constant dealloying time, the extent of faceting increases as the potential is moved positively, and at a constant applied potential it increases with electrodissolution time. The proportionality ξ ∝ Lα was established, where ξ is the interface width related to L, the sample size. The exponent R is related to the degree of surface disorder. The value of R derived from STM is in the range 0.7 ≤ α ≤ 0.8, i.e. close to the predictions of aggregation models including surface diffusion.
format Articulo
Articulo
author Morales, J.
Esparza, P.
González, S.
Vázquez, L.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_facet Morales, J.
Esparza, P.
González, S.
Vázquez, L.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_sort Morales, J.
title Kinetics and Mechanism of β-Brass Dealloying in Aqueous 0.5 M Sodium Chloride Solution Derived from Combined Scanning Tunneling Microscopy and Electrochemical Data
title_short Kinetics and Mechanism of β-Brass Dealloying in Aqueous 0.5 M Sodium Chloride Solution Derived from Combined Scanning Tunneling Microscopy and Electrochemical Data
title_full Kinetics and Mechanism of β-Brass Dealloying in Aqueous 0.5 M Sodium Chloride Solution Derived from Combined Scanning Tunneling Microscopy and Electrochemical Data
title_fullStr Kinetics and Mechanism of β-Brass Dealloying in Aqueous 0.5 M Sodium Chloride Solution Derived from Combined Scanning Tunneling Microscopy and Electrochemical Data
title_full_unstemmed Kinetics and Mechanism of β-Brass Dealloying in Aqueous 0.5 M Sodium Chloride Solution Derived from Combined Scanning Tunneling Microscopy and Electrochemical Data
title_sort kinetics and mechanism of β-brass dealloying in aqueous 0.5 m sodium chloride solution derived from combined scanning tunneling microscopy and electrochemical data
publishDate 1996
url http://sedici.unlp.edu.ar/handle/10915/121479
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