On the optimum soil moisture for underground corrosion in different soil types

R. M. Azoor; R. N. Deo; N. Birbilis; J. Kodikara

doi:10.1016/j.corsci.2019.108116

On the optimum soil moisture for underground corrosion in different soil types

R. M. Azoor, R. N. Deo, N. Birbilis, J. Kodikara^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

Corrosion rates in sand, silt, and clay were investigated at various degrees of saturation (S_r) revealing that all three soil types have a distinct optimum S_r at which the corrosion rate is maximised. Sand, silt, and clay showed maximum corrosion currents at S_r ≈0.5, S_r ≈0.7, and S_r ≈0.8 respectively. We show that the optimum moisture level at which the corrosion rate becomes a maximum for a given soil type corresponds to the air transition point related to its water retention curve. We provide an explanation for this phenomenon elucidating previous observations, and highlight implications to current engineering practice.

Original language	English
Article number	108116
Journal	Corrosion Science
Volume	159
DOIs	https://doi.org/10.1016/j.corsci.2019.108116
Publication status	Published - Oct 2019

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title = "On the optimum soil moisture for underground corrosion in different soil types",

abstract = "Corrosion rates in sand, silt, and clay were investigated at various degrees of saturation (Sr) revealing that all three soil types have a distinct optimum Sr at which the corrosion rate is maximised. Sand, silt, and clay showed maximum corrosion currents at Sr ≈0.5, Sr ≈0.7, and Sr ≈0.8 respectively. We show that the optimum moisture level at which the corrosion rate becomes a maximum for a given soil type corresponds to the air transition point related to its water retention curve. We provide an explanation for this phenomenon elucidating previous observations, and highlight implications to current engineering practice.",

keywords = "A. Low alloy steel, B. Polarization, C. Oxygen reduction, C. Underground corrosion",

author = "Azoor, {R. M.} and Deo, {R. N.} and N. Birbilis and J. Kodikara",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

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AU - Azoor, R. M.

AU - Deo, R. N.

AU - Birbilis, N.

AU - Kodikara, J.

PY - 2019/10

Y1 - 2019/10

N2 - Corrosion rates in sand, silt, and clay were investigated at various degrees of saturation (Sr) revealing that all three soil types have a distinct optimum Sr at which the corrosion rate is maximised. Sand, silt, and clay showed maximum corrosion currents at Sr ≈0.5, Sr ≈0.7, and Sr ≈0.8 respectively. We show that the optimum moisture level at which the corrosion rate becomes a maximum for a given soil type corresponds to the air transition point related to its water retention curve. We provide an explanation for this phenomenon elucidating previous observations, and highlight implications to current engineering practice.

AB - Corrosion rates in sand, silt, and clay were investigated at various degrees of saturation (Sr) revealing that all three soil types have a distinct optimum Sr at which the corrosion rate is maximised. Sand, silt, and clay showed maximum corrosion currents at Sr ≈0.5, Sr ≈0.7, and Sr ≈0.8 respectively. We show that the optimum moisture level at which the corrosion rate becomes a maximum for a given soil type corresponds to the air transition point related to its water retention curve. We provide an explanation for this phenomenon elucidating previous observations, and highlight implications to current engineering practice.

KW - A. Low alloy steel

KW - B. Polarization

KW - C. Oxygen reduction

KW - C. Underground corrosion

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DO - 10.1016/j.corsci.2019.108116

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SN - 0010-938X

VL - 159

JO - Corrosion Science

JF - Corrosion Science

M1 - 108116

ER -

On the optimum soil moisture for underground corrosion in different soil types

Abstract

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