Mathematical Analysis of Circular Corrosion Cells Having Unequal Polarization Parameters.
NAVAL RESEARCH LAB WASHINGTON D C
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A theoretical analysis is given for the distribution of electrode potential and current across the surface of coplanar circular galvanic cells in which the polarization parameters of the central anode and disk cathode are unequal. Central features of the model are that the electrostatic potential within the system is given by Laplaces equation and that the polarization curves of both components can be approximated by linear segments over an extended potential range. The potential distribution in a system of unequal anodic and cathodic polarization parameters is not related in a simple manner to the distribution curves for equal parameters. For bulk electrolyte the value of the electrode potential across the surface depends on whether the system is under anodic, cathodic, or mixed control. The current distribution is the more uniform for combinations of more polarizable electrodes. In thin-layer electrolytes there is a geometry effect in which electrode polarization and current flow are concentrated near the anodecathode juncture. Author
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