2018 Volume 67 Issue 3 Pages 118-120
Soil corrosion of metal is a complicated phenomenon because various environmental factors are related with each other, and the effect of these environmental factors on corrosion rate of metal is still unclear. In this study, the effects of soil particle size and water content on the corrosion rate were investigated. The AC impedance method was used for measuring the corrosion rates of carbon steel buried in soil whose grains were coarse and fine, respectively. The corrosion rate of carbon steel in the fine-grain soil showed a maximum value at lower water content than in the coarse-grain soil. This can be explained by supposing a balance between water-dissolved oxygen diffusion distance and wet area of the carbon steel surface. In the fine-grain soil, the wet area and thin moisture layer on the carbon steel might be preserved even at the lower water content.
