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- Title
Mapping of pH gradients in a micrometric occluded cell: comparison with a pseudo-2D transport model.
- Authors
Percheron, Aurélien; Vuillemin, Bruno; Oltra, Roland; Markey, Laurent
- Abstract
This paper presents an experiment suitable for validating calculated pH gradients inside an occluded cell. Photolithography is used to pattern a 10 μm thick cavity former on a stainless steel surface, providing a rigorously controlled experimental support for transport models such as those proposed in the fields of crevice corrosion or cathodic delamination. pH gradients over the electrode are measured by total internal reflection fluorescence microscopy (TIRFM) during cathodic polarization under potentiostatic and galvanostatic conditions. The pH profiles calculated using a pseudo-two-dimensional (pseudo-2D) transport model agree well with experimental data, except that the rates of pH increase observed experimentally are much slower than the simulated ones.
- Subjects
ELECTRIC batteries research; ACID-base chemistry; PHOTOLITHOGRAPHY; CORROSION prevention; DELAMINATION of composite materials; FLUORESCENCE microscopy
- Publication
Journal of Applied Electrochemistry, 2011, Vol 41, Issue 3, p355
- ISSN
0021-891X
- Publication type
Article
- DOI
10.1007/s10800-010-0239-y