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Effect of Gradient of Soil Aeration on Corrosion Rate at Different Depths from Ground Surface

Soil corrosion around a ground surface was experimentally examined by measuring macrocell current, spontaneous potential, and corrosion weight loss at different depths in soil. An experiment was carried out by placing small electrodes and small test pieces in the depth direction. The results showed that mainly anodic current flowed in the electrode around the ground surface. In addition, the corrosion rate estimated based on weight loss was the highest. Therefore, it is considered that macrocell current influences soil corrosion around the ground surface. However, it appears that the spontaneous potential difference and macrocell current due to the gradient of soil aeration do not contribute significantly to soil corrosion around the ground surface.