Abstract
The conditions under which the cathode of a galvanic couple will corrode have been considered and an equation has been derived to describe this behaviour. Cathode corrosion leads to a decrease in the galvanic current. For a large ratio of surface area of cathode to anode and a small free corrosion potential difference between the alloys, it is shown that the galvanic current density through the anode is independent of the surface area ratio. It is also shown to be less than the product of the area ratio and the current density due to oxygen reduction at the cathode.
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