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Influence of Oxygen Diffusion Coefficients and Soil Moisture Content on the Corrosion Behavior of Carbon Steel

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Buried steel pipelines operating in soil environments are constantly under threat from corrosion, a phenomenon which jeopardizes their structural integrity and escalates the risk of material degradation, leakage, and subsequent environmental hazards. A holistic understanding of the corrosion process in soil environments is essential for strengthening infrastructural resilience and upholding environmental sustainability.


Corrosion of metals in soils is dictated by a complex confluence of several factors, including aeration, pH, moisture content, ionic composition, electrical resistivity, and microbial activity1.

Product Number: MECC23-20174-SG
Author: Layan AlSharif; Mohammed Alshahrani; Abdulrahman Alqahtani; Hussam Attar; Othman Alolayan
Publication Date: 2023
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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.

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.

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