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In this paper is presented the application of the Method of Fundamental Solution (MFS) to obtain the solution of Laplace equation with linear boundary conditions to describe the distribution of potentials in corrosion cells. The results obtained by this method are compared with another numerical method, in this case finite element. As case of study takes the interior problem analyzed by McCafferty (1). In which two concentric electrodes placed in bottom of a cylindrical container, creating a galvanic cell. The results obtained by the MFS present a good agreement with the calculated by finite element.