Abstract
The Laplace's equation has been solved numerically by means of the Boundary Elements Method (B.E.M.) to calculate the electrochemical impedance of a localized corrosion site. The calculated diagrams have been compared to the experimental E.I.S. spectra of a specially designed galvanic cell which consisted of a small dissolving wire (iron rod lmm in diameter) surrounded by large rings of various geometries (stainless steel electrically insulated from the iron wire) where the cathodic reaction occurred. The main experimental result is the change of the wire impedance in the high frequency range when the dissolving wire is connected to the cathodic ring (in a galvanic situation). A good agreement has been found with the simulated diagrams by the BEM method. A discussion is proposed about the role of the current distribution in a galvanic cell on the validity of the fitting of E.I.S. by equivalent electrical networks with a simply parallel arrangement.
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