Abstract
Current flow, weight loss, and polarization measurements have been carried out on the aluminum‐mild steel and zinc‐mild steel couples in normal solution at 25°C. Under a wide variety of experimental conditions both aluminum and zinc are anodic to mild steel and completely protect it against corrosion. In both galvanic couples the current flow and weight losses of the anodes are proportional to the area of the steel cathode and are much less dependent on the anode area. Galvanic corrosion rates of both couples appear to be controlled by oxygen depolarization and are thus markedly increased by stirring. At high stirring rates, the aluminum‐steel couple delivers a much higher galvanic current than the zinc‐steel couple.
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