RT info:eu-repo/semantics/article
T1 Development of Mg2+ ion-selective microelectrodes for potentiometric Scanning Electrochemical Microscopy monitoring of galvanic corrosion processes
A1 Souto, Ricardo Manuel
A1 Izquierdo Pérez, Javier
A1 Kiss, András
A1 Santana, Juan José
A1 Nagy, Lívia
A1 Bitter, István
A1 Isaacs, Hugh S.
A1 Nagy, Géza
K1 scanning electrochemical microscopy
K1 magnesium ion-selective electrode
K1 potentiometric operation
K1 anodic dissolution
K1 galvanic corrosion
AB The fabrication of a solid-contact, micropipette-based magnesium ion-selective micro-tipped electrode (ISME) suitable for scanning electrochemical microscopy is reported.and compared against a conventional micro-tipped ISME having a conventional aqueous internal reference electrode. Measurements showed that the solid-contact ISME had a lower internal resistance and a faster response time than the one with a liquid-contact These advantages increased the spatial distribution and improved 2D images depicting concentration distributions of Mg2+. The ability of the microelectrode to image local ionic concentration has been tested over magnesium surfaces freely corroding or galvanically coupled to iron in aqueous chloride-containing solution. Scans of magnesium ion distribution, in the absence of corrosion currents, were also made over a micro-pipette source containing a concentrated magnesium chloride gel as a source pf Mg2+ and over a current source in the absence of Mg2+. From these measurements it was concluded that the potentiometric measurements over corroding surfaces were dominated by the changes in Mg2+ distributions with small electric potential contributions due to corrosion current
YR 2013
FD 2013
LK http://riull.ull.es/xmlui/handle/915/19152
UL http://riull.ull.es/xmlui/handle/915/19152
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 16-may-2024