The Electrochemical Behavior of Iron in Corrosion Cells

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Abstract
The effect of current density on the potential of the two poles of iron corrosion cells is determined for various conditions. In the absence of dissolved oxygen at the anode or in the presence of chloride type anions, polarization at the anode is negligible and corrosion is limited by cathode polarization. In the presence of phosphate type anions in aerated solutions, both anode and cathode are so extensively polarized that little damage can be done. Mixtures of the two types of anions show an effect in aerated solutions that depends on the ratio of concentrations of these ions and on the specific anions present. In the presence of such mixtures the anode tends to become more active with time as chloride type anions accumulate at it while phosphate type anions are held back in the form of insoluble corrosion products.

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