Journal
ELECTROCHIMICA ACTA
Volume 56, Issue 24, Pages 8846-8850Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.07.076
Keywords
Scanning electrochemical microscopy; Galvanic corrosion; pH distribution; Antimony microelectrode
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Funding
- National Office for Research and Technology (NKTH, Budapest) [ES-25/2008 TeT]
- Spanish Ministry of Science and Innovation (MICINN, Madrid) [HH2008-0011]
- MICINN
- European Regional Development Fund (Brussels, Belgium) [CTQ2009-12459]
- MICINN (Programa de Formacion de Personal investigador)
- Developing Competitiveness of Universities in the South Transdanubian Region [SROP-4.2.1.B-10/2/KONV-2010-0002]
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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. (C) 2011 Elsevier Ltd. All rights reserved.
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