RT info:eu-repo/semantics/article
T1 Combined amperometric/potentiometric probes for improved chemical imaging of corroding surfaces using Scanning Electrochemical Microscopy
A1 Souto, Ricardo Manuel
A1 Filotás, Dániel
A1 Fernández Pérez, Bibiana María
A1 Izquierdo Pérez, Javier
A1 Nagy, Lívia
A1 Nagy, Géza
K1 Scanning Electrochemical Microscopy (SECM)
K1 Microelectrode probes
K1 pH 28 gradients
K1 Galvanic corrosion
K1 Iron
K1 Copper
AB Chemical visualization of corrosion processes using scanning electrochemical microscopy (SECM) in combined amperometric/potentiometric operation has been achieved by developing novel multi-barrel probes as tips. A Pt-based amperometric disc probe is employed for the detection and characterization of reactive sites on a corroding system, whereas a Sb-based disc microelectrode is employed to visualize local solution pH changes. Quasi-simultaneous imaging of localized corrosion micro-cells on the surface and the associated pH variations in the electrolyte, resulting from both the electrolysis of dissolved metal ions from the local anodes and the consumption of an oxidizing agent at the local cathodes, can be obtained in the same solution without changing the probe. Galvanic corrosion of a model Cu-Fe pair in chloride-containing solution was visualized with high spatial resolution by recording either line scans or 2D-images using the novel Pt/Sb multi-barrel tip.
YR 2016
FD 2016
LK http://riull.ull.es/xmlui/handle/915/18997
UL http://riull.ull.es/xmlui/handle/915/18997
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 27-dic-2024