RT info:eu-repo/semantics/article
T1 Scanning electrochemical microscopy for the investigation of corrosion processes: measurement of Zn2+ spatial distribution with ion selective microelectrodes.
A1 Souto, Ricardo Manuel
A1 Izquierdo Pérez, Javier
A1 Nagy, Lívia
A1 Varga, Ágnes
A1 Bitter, István
A1 Nagy, Géza
K1 scanning electrochemical microscopy
K1 potentiometric operation
K1 ion selective microelectrode
K1 zinc
K1 galvanic corrosion
AB Ion-selective microelectrodes can be employed as tips in scanning electrochemical microscopy (SECM) for chemical imaging of corrosion processes. They present higher chemical selectivity than conventional amperometric microdisks, and may be the only effective option to visualize the dissolution of metals with negative redox potentials in aqueous environments when the use of Pt microelectrodes is limited by the onset of oxygen reduction and hydrogen evolution reactions. A robust micro-sized ion selective electrode has been developed which allows the spatial distribution of Zn2+ during galvanic corrosion of a model Fe/Zn couple to be investigated using SECM. Owing to the low internal contact potential and smaller membrane thickness achieved with the novel design, the resistance of the micropipette electrodes is only fractions of the resistance of conventional micropipette electrodes of the same size. As a result, no special shielding of the microelectrodes is required and higher scanning rate can be used for scanning in the potentiometric modes using these micropipette tips. Concentration profiles over corroding surfaces measured with this technique will be presented
YR 2011
FD 2011
LK http://riull.ull.es/xmlui/handle/915/19168
UL http://riull.ull.es/xmlui/handle/915/19168
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 05-may-2024