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An interpretation of the relation between the electric feld and the applied current for cathodic protection is investigated using a boundary element method simulation. Also, a conductivity-diference environment is set for the interface infuence. The variation of the potential distribution is increased with the increase of the applied current and the conductivity diference due to the rejection of the current at the interface. In the case of the electric feld, the tendencies of the increasing rate and the applied currents are similar, but the interface infuence is diferent according to the directional component and feld type (decrease of Ez and increases of Ex and Ey) due to the directional diference between the electric felds. Also, the change tendencies of the electric felds versus the applied current plots are afected by the polarization curve tendency regarding the polarization type (activation and concentration polarizations in the oxygen-reduction and hydrogen-reduction reactions). This study shows that the underwater electric signature is determined by the polarization behavior of the materials.

Keywords, Metals, Corrosion, Computer simulation, Interface

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