Aplicación de un puente LCR en la caracterización de superficies de níquel tratadas voltamperométricamente en medio ácido en ausencia y presencia de ion cloruro

J. Gregori; J. Agrisuelas; D. Giménez; M. P. Peña; J. J. García-Jareño; F. Vicente

doi:10.3989/revmetalm.2003.v39.i5.347

Application of an LCR bridge in the characterization of nickel surfaces voltametrically treated in acid media in absence and in presence of chloride ion

Authors

J. Gregori Departamento de Química-Física.
J. Agrisuelas Departamento de Química-Física.
D. Giménez Departamento de Química-Física.
M. P. Peña Departamento de Ingeniería Química.
J. J. García-Jareño Departamento de Química-Física.
F. Vicente Departamento de Química-Física.

DOI:

https://doi.org/10.3989/revmetalm.2003.v39.i5.347

Keywords:

Electrodissolution, Nickel, SEM, STM, Localized corrosion, LCR bridge, EIS

Abstract

Impedance spectra for nickel electrodes at his corrosion potential after voltammetric treatment in acid media has been obtained. A LCR bridge has been used, controlling the applied potential by means of a potentiostat. The passive layer, generated after successive potential scans, has been characterized by means of the interfacial double layer capacitance and the faradaic impedance. The generalized corrosion, and also the localized attack, have been observed by means of scanning electron microscopy (SEM), whilst the scanning tunnelling microscopy (STM) has been used in order to realize the morphological analysis of the surfaces. In this way we want to correlate the morphological changes in the electrode surface after the successive scans in the acid media in absence and in presence of chloride with the impedance electrochemical response of the interface. When chloride is present in the acid media the charge transport across the interface is less impeded. The localized corrosion damages the passive layer electrogenerated after successive scans.

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Published

2003-10-30

How to Cite

Gregori, J., Agrisuelas, J., Giménez, D., Peña, M. P., García-Jareño, J. J., & Vicente, F. (2003). Application of an LCR bridge in the characterization of nickel surfaces voltametrically treated in acid media in absence and in presence of chloride ion. Revista De Metalurgia, 39(5), 346–356. https://doi.org/10.3989/revmetalm.2003.v39.i5.347

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Issue

Vol. 39 No. 5 (2003)

Section

Articles

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