RT info:eu-repo/semantics/article
T1 Scanning electrochemical microscopy studies for the characterization of localized corrosion reactions at cut edges of coil-coated stee
A1 Souto, Ricardo Manuel
A1 Fernández Pérez, Bibiana María
A1 Izquierdo Pérez, Javier
A1 González, Sergio
K1 SECM
K1 galvanic corrosion
K1 concentration distributions
K1 cut edges
K1 aluzinc
K1 steel
AB The local distribution of anodic and cathodic sites in a corroding cut edge using the scanning electrochemical microscope is presented. Platinum and antimony microdisks were used as tips for combined amperometric/potentiometric operation. Local changes in electrochemical activity, oxygen concentration and pH distribution associated to the onset of localized anodes and cathodes were imaged in situ, as well as their evolution with time. Local alkalization and oxygen consumption related to cathodic activity were detected above the zinc layer covered with the thinner polymeric coating, providing a direct evidence of a differential aeration process effectively operating in an asymmetrical cut edge, in addition to the galvanic coupling of aluzinc and steel. Anodic activity leading to local acidification occurred at the other aluzinc layer at all exposures.
YR 2014
FD 2014
LK http://riull.ull.es/xmlui/handle/915/19143
UL http://riull.ull.es/xmlui/handle/915/19143
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 04-may-2024