Abstract
Simple relationships between current flow and the corrosion rates of iron anodes and cathodes have been suggested at different times but are not accepted as fundamentally sound. The results of corrosion tests made with a variety of metals and solutions were examined from a practical point of view and it was found that these relationships are more widely applicable than heretofore believed. It was observed that : (1) The anode weight loss in galvanic corrosion tests was approximately equal to the sum of the loss due to normal corrosion plus that calculated from the galvanic current by Faraday's Law. (2) At least for corrosion of the oxygen depolarization type, the decrease in corrosion of the cathode was roughly equivalent to the current. The protective current density was that equivalent to the normal rate of corrosion of the cathode metal in the same corrosive environment.
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