Affiliation:
1. University of La Laguna
2. University of Pécs
Abstract
The scanning electrochemical microscope (SECM) offers a highly sensitive route to evaluate degradation reactions and protection methods with chemical selectivity by using ion-selective microelectrodes as tips, thus operating SECM potentiometrically. Spatially resolved imaging of electrochemical reactivity related to each component of the investigated material can thus be effectively monitored selectively both in situ and in real time. The applicability of this method has been illustrated using a practical example of a metal-coating system, consisting in the exposure of cut edges of coil-coated galvanized steel to aqueous saline environment. In this contribution, localized pH and zinc(II) ion distributions originated around cut edges of coil coated steel immersed in 1 mM NaCl solution are shown.
Publisher
Trans Tech Publications, Ltd.
Reference7 articles.
1. P. Marcus, F. Mansfeld (Eds. ), Analytical Methods in Corrosion Science and Engineering, CRC Press, Boca Raton, (2006).
2. M. B. Jensen, D. E. Tallman, Application of SECM to corrosion studies, in: AJ Bard, and CG Zoski (Eds. ), Electroanal. Chem.: A Ser. Adv. CRC Press, Boca Raton, 24 (2012) 171-286.
3. S. Rossi, M. Fedel, F. Deflorian, M. C. Vadillo, Localized electrochemical techniques: Theory and practical examples in corrosion studies, C. R. Chim. 11 (2008) 984-994.
4. R. M. Souto, S. V. Lamaka, S. González, Uses of scanning electrochemical microscopy in corrosion research, in: A. Méndez-Vilas, J. Díaz (Eds. ), Microscopy: Science, Technology, Applications and Education, Vol. 3, Formatex Research Center, Badajoz, 2010, 1769-1780.
5. J. Izquierdo, L. Nagy, Á. Varga, J. J. Santana, G. Nagy, R. M. Souto, Spatially resolved measurement of electrochemical activity and pH distributions in corrosion processes by scanning electrochemical microscopy using antimony microelectrode tips, Electrochim. Acta 56 (2011).