Soil Corrosion of Differential Aeration Cells and Conditions of Their Operation

摘要

Potentials stabilized at the anode and cathode of a differential aeration cell (DAC) under free cor-rosion conditions, electric contact, and cathode polarization are analyzed. It is shown that the soil conductivity limits the possibility of cathode protection. The shallow pit formation at the cathode and pitting at the anode are the main corrosion types in the half-cells. The rate of development of local corrosion centers on the surfaces of both half-cells is virtually independent of the conditions of DAC operation.