This paper presents an experimental investigation that correlates the oxygen diffusion coefficient to the corrosivity of distinct Saudi Arabian soil types under various degrees of saturation (Sr). The corrosivity of the soils were assessed using electrochemical techniques including open circuit potential, electrochemical impedance spectroscopy, and potentiodynamic polarization while the effective oxygen diffusion coefficients (De) of the soils were obtained using a dual-chamber experimental setup coupled with an analytical model based on Fick’s laws. The experimental results revealed corrosion severity to be strongly underpinned by Sr and De. All soil types exhibited a distinct critical Sr ~ 0.75 at which the corrosion rate is maximized.

Subject
Circuits, Electrochemical impedance spectroscopy, Water, Moisture, Diffusion, Corrosivity, Saturation, Soil resistivity, Electrical resistivity, Steel, Oxygen, Linear polarization resistance, Soil
Keywords:
carbon steel, soil corrosion, diffusion, electrochemical measurement
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2023
Association for Materials Protection and Performance (AMPP)
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