Spatially resolved measurement of electrochemical activity and pH distributions in corrosion processes by scanning electrochemical microscopy using antimony microelectrode tips

Javier Izquierdo, Lívia Nagy, Ágnes Varga, Juan J. Santana, Géza Nagy, Ricardo M. Souto

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43 Citations (Scopus)

Abstract

A new method for the spatially resolved measurement of pH during corrosion processes with the scanning electrochemical microscope (SECM) is presented. Antimony tips are employed because the dual-function characteristics of this material allow the combined amperometric/potentiometric operation of the SECM. The applicability of this technique is illustrated by considering the galvanic corrosion of a model zinc-iron pair immersed in 0.1 M NaCl aqueous solution. Spatially resolved images of pH and oxygen concentration above the metal specimens could be obtained in the same experiment.

Original languageEnglish
Pages (from-to)8846-8850
Number of pages5
JournalElectrochimica Acta
Volume56
Issue number24
DOIs
Publication statusPublished - Oct 1 2011

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Keywords

  • Antimony microelectrode
  • Galvanic corrosion
  • Scanning electrochemical microscopy
  • pH distribution

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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