Evaporation of Electrolyte During SVET Measurements: The Scale of the Problem and the Solutions
authors Bouali, AC; Bastos, AC; Lamaka, SV; Serdechnova, M; Ferreira, MGS; Zheludkevich, ML
nationality International
journal ELECTROANALYSIS
author keywords SVET; scanning vibrating electrode technique; solution evaporation; conductivity
keywords SCANNING VIBRATING ELECTRODE; LOCALIZED CORROSION; PROTECTIVE-COATINGS; ALUMINUM; PERFORMANCE; MECHANISM; DEFECT; STEEL
abstract The objective of this work is to investigate the scale of the effect of spontaneous solution evaporation during SVET (Scanning Vibrating Electrode Technique) measurements and demonstrate how it biases the final results. When SVET maps are continuously acquired for more than several hours, the measured currents are smaller than expected. This is attributed to solvent (typically water) evaporation which leads to an increase in solution conductivity over time. If this is not considered when converting the measured potential differences into the local current densities, the SVET results display currents smaller than the true ones. Here, this effect is studied with a platinum disk electrode as source of a constant current and a model corroding system consisting of the AA2024/CFRP galvanic couple. Corrective actions are proposed to mitigate the problem, either in the experimental set-up or as numerical correction.
publisher WILEY-V C H VERLAG GMBH
issn 1040-0397
isbn 1521-4109
year published 2019
volume 31
issue 11
beginning page 2290
ending page 2298
digital object identifier (doi) 10.1002/elan.201900435
web of science category Chemistry, Analytical; Electrochemistry
subject category Chemistry; Electrochemistry
unique article identifier WOS:000483130900001
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journal analysis (jcr 2019):
journal impact factor 2.544
5 year journal impact factor 2.623
category normalized journal impact factor percentile 48.331
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