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International Journal of Corrosion
Volume 2014, Article ID 102363, 6 pages
http://dx.doi.org/10.1155/2014/102363
Research Article

Corrosion Potential Profile Simulation in a Tube under Cathodic Protection

Grupo de Ingeniería Electroquímica, Instituto de Ingeniería Química, Facultad de Ingeniería, UdelaR, Julio Herrera y Reissig 565, 11300 Montevideo, Uruguay

Received 28 July 2014; Accepted 30 November 2014; Published 18 December 2014

Academic Editor: Michael J. Schütze

Copyright © 2014 Mauricio Ohanian and Víctor Martínez-Luaces. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The potential distribution in tubes of a heat exchanger is simulated when applying cathodic polarization to its extremes. The comparison of two methods to achieve this goal is presented: a numeric solution based on boundary elements carried out with the commercial software Beasy-GID and a semianalytical method developed by the authors. The mathematical model, the simplifications considered, and the problem solving are shown. Since both approaches use polarization curves as a boundary condition, experimental polarization curves (voltage versus current density) were determined in the laboratory under flow conditions and cylindrical cell geometry. The results obtained suggest the impossibility of extending the protection along the whole tube length; therefore, other protection methods are considered.