2024 Volume 73 Issue 8 Pages 200-209
Soil corrosion rate for architecture and civil engineering is regarded as 0.02 mm/year regardless of the soil. However, it is considered that corrosion rates of each soil are different because soil properties such as particle size, water content, chemical composition and pH are different. In this study, we measured dissolved oxygen diffusion coefficient of each soil and each water content and evaluated the charge transfer resistance of each dissolved oxygen concentration by AC impedance method, to investigate the effect of dissolved oxygen diffusion on soil corrosion.
It was suggested that major oxygen diffusion path in soil is air that dispersed into soil. As a result, dissolved oxygen diffusion coefficient was correlated with air-filled porosity. It is suggested that the corrosion rate in soil increase with increase of air-filled porosity （decrease of water content） in case of considering not metal-water interface surface area.
