Artículos de revistas
Local electrochemical investigation of copper patina
Fecha
2012Registro en:
JOURNAL OF SOLID STATE ELECTROCHEMISTRY, NEW YORK, v. 16, n. 1, pp. 109-116, JAN, 2012
1432-8488
10.1007/s10008-010-1290-7
Autor
Mennucci, Marina Martins
Sanchez-Moreno, M.
Aoki, Idalina Vieira
Bernard, M-C.
Melo, Hercilio Gomes de
Joiret, S.
Vivier, Vincent
Institución
Resumen
The patination of copper is known for its complexity and heterogeneous formation. For a deeper investigation, a locally resolved surface analysis was considered. An exact determination of the accessed area and a potentiostatic control in a three-electrode configuration was reached with the use of the electrochemical microcell technique, which enables local electrochemical measurement such as local electrochemical impedance spectroscopy and cyclic voltammetry. Such a technique provides a unique way for performing the investigation of heterogeneities on electrode surfaces. The local electrochemical measurements on the artificially patinated surface have allowed distinguishing areas of different reactivity even when the analysis of the surface revealed a homogenous chemical composition of patina. Local measurements with the electrochemical microcell showed the presence of small defects on the patina layer that can be modelled by considering a hemispherical diffusion process at small active areas surrounded by larger less reactive domains.