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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents



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ID: 211198.0, Fritz-Haber-Institut / Physical Chemistry
Electrochemical probes for metal/electrolyte system characterization during crevice corrosion
Authors:Wolfe, Ryan C.; Weil, Konrad G.; Pickering, Howard W.
Language:English
Date of Publication (YYYY-MM-DD):2004-04-28
Title of Journal:Journal of Physical Chemistry B
Journal Abbrev.:J. Phys. Chem. B
Volume:108
Issue / Number:38
Start Page:14298
End Page:14304
Title of Issue:Gerhard Ertl Festschrift
Full name of Issue-Editor(s):Freund, Hans-Joachim; Knözinger, Helmut
Copyright:© 2004 American Chemical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Electrochemical microprobes for monitoring of the electrochemical conditions inside recesses are needed to better understand how localized corrosion and other charge-transfer processes occur in confined spaces. The electrode potential distribution can be routinely measured in cavities of greater than 100 m opening dimension, but the ability to measure the concentrations of chemical species and their change with time in the presence of potential gradients is only recently becoming possible. Microprobes for potential, pH, and chloride ion will be described, and results with these sensors will be presented and discussed for creviced iron samples in aqueous electrolytes. Results reveal that these species change in concentration and distribution with time, with the greatest ionic concentrations corresponding to locations of highest metal dissolution rate on the crevice wall. These new physical chemistry insights provide a better understanding of the passive-to-active behavior in crevices.
Free Keywords:
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Wolfe RC, Pickering HW, The Pennsylvania State University, Department of Materials Science and Engineering, 326 Steidle Building, University Park, Pennsylvania 16802, USA
Identifiers:URL:http://pubs.acs.org/cgi-bin/abstract.cgi/jpcbfk/20...
DOI:10.1021/jp040045c
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