Journal
PROGRESS IN ORGANIC COATINGS
Volume 74, Issue 3, Pages 526-533Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2012.01.019
Keywords
Corrosion inhibition; Scanning electrochemical microscopy (SECM); Scanning vibrating electrode technique (SVET); Copper; Mercaptobenzimidazole (MBI)
Funding
- Ministerio de Ciencia e Innovacion (Madrid, Spain)
- European Regional Development Fund (Brussels, Belgium) [CTQ2009-12459/PPQ]
- Agencia Canaria de Investigacion (Canary Islands, Spain)
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The aim of this work is to explore the applicability of the scanning electrochemical microscope (SECM) to characterize the inhibiting effect of 2-mercaptobenzimidazole against the corrosion of copper. SECM was operated in the feedback mode by using ferrocene-methanol as redox mediator, and the sample was left unbiased at all times. The kinetic changes in the corrosion processes were monitored over time from the Z-approach curves. Furthermore, inhibitor-modified copper samples presenting various surface finishes were imaged by SECM and the scanning vibrating electrode technique (SVET), allowing changes both in the surface activity of metal-inhibitor films and in the extent of corrosion attack to be spatially resolved. Differences in the local electrochemical activity between inhibitor-free and inhibitor-covered areas of the sample were successfully monitored. (C) 2012 Elsevier B.V. All rights reserved.
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