Soil Corrosion of Differential Aeration Cells and Conditions of Their Operation

N. N. Glazov, S. M. Ukhlovtsev, I. I. Reformatskaya, A. N. Podobaev, and I. I. Ashcheulova

FGUP GNTs RF Karpov Institute of Physical Chemistry,
ul. Vorontsovo pole 10, Moscow, 105064 Russia

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Received March 18, 2005

Abstract — Potentials stabilized at the anode and cathode of a differential aeration cell (DAC) under free corrosion conditions, electric contact, and cathodic polarization are analyzed. It is shown that the soil conductivity limits the possibility of cathodic 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.