Cell action is explained to electrical engineers by analogous equivalent circuits and polarization diagrams. Adopting a simplified concept of a theoretical corrosion cell the criterion of complete cathodic protection is defined. By means of a simple galvanic cell concept and with descriptive polarization diagrams the criteria of minimum cathodic protection under certain relationships of current density between the anode and the cathode are discussed. Effect of anodic and cathodic control, the Pearson null method, similar electrodes with impressed potential, resistance of cell circuit, are covered.

Laboratory tests with lead electrodes are reported. 9 figures.

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Copyright 1955 by the National Association of Corrosion Engineers.
1955
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