Abstract
The problem of monitoring of corrosion of large metallic structures by EIS is approached in the simple case of a long locally corroded bar, in contact with an electrolyte or embedded in concrete. The influence of the shapes, sizes and arrangement of the electrodes on the interpretation of impedance measurements is shown to be very important. A model is proposed to describe the influence of the large size of the working electrode which induces a spatial distribution of the impedance. This effect of spatial distribution may allow accurate location of the corroded areas and quantitative analysis of corrosion of these areas.
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