Electrochemical behavior of API-X100 pipeline steel in NS4, near-neutral, and mildly alkaline pH simulated soil solutions

Ibrahim M. Gadala; Akram Alfantazi

doi:10.1016/j.corsci.2013.12.020

Electrochemical behavior of API-X100 pipeline steel in NS4, near-neutral, and mildly alkaline pH simulated soil solutions

Ibrahim M. Gadala
, Akram Alfantazi

Chemical and Petroleum Engineering

The University of British Columbia

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

92 Scopus citations

Abstract

The effect of environmental parameters on the electrochemical corrosion of X100 steel in NS4 simulated soil solution is investigated. The parameters examined were pH (4.7-9), purging gas (5% carbon dioxide (CO₂)/95% nitrogen (N₂), 100% carbon dioxide, and 100% nitrogen), solution temperature (25, 40, and 55°C), bicarbonate (HCO3-) concentration, chloride (Cl^-), and sulfate (SO42-). Overall, corrosion rates of the specimens decreased with pH. Sufficient bicarbonate was critical for the passivation of the steel. Higher chloride/sulfate content prevented stable passivation. Impedance results reveal the involvement of adsorption and parallel adsorption-diffusion in near-neutral and mildly alkaline conditions, respectively.

Original language	British English
Pages (from-to)	45-57
Number of pages	13
Journal	Corrosion Science
Volume	82
DOIs	https://doi.org/10.1016/j.corsci.2013.12.020
State	Published - May 2014

Keywords

A. Low alloy steel
B. EIS
B. Polarization
C. Acid corrosion
C. Alkaline corrosion

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10.1016/j.corsci.2013.12.020

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@article{1f79d663d52e4aa3a9ac687c15d0145d,

title = "Electrochemical behavior of API-X100 pipeline steel in NS4, near-neutral, and mildly alkaline pH simulated soil solutions",

abstract = "The effect of environmental parameters on the electrochemical corrosion of X100 steel in NS4 simulated soil solution is investigated. The parameters examined were pH (4.7-9), purging gas (5\% carbon dioxide (CO2)/95\% nitrogen (N2), 100\% carbon dioxide, and 100\% nitrogen), solution temperature (25, 40, and 55°C), bicarbonate (HCO3-) concentration, chloride (Cl-), and sulfate (SO42-). Overall, corrosion rates of the specimens decreased with pH. Sufficient bicarbonate was critical for the passivation of the steel. Higher chloride/sulfate content prevented stable passivation. Impedance results reveal the involvement of adsorption and parallel adsorption-diffusion in near-neutral and mildly alkaline conditions, respectively.",

keywords = "A. Low alloy steel, B. EIS, B. Polarization, C. Acid corrosion, C. Alkaline corrosion",

author = "Gadala, \{Ibrahim M.\} and Akram Alfantazi",

note = "Funding Information: This publication was made possible by NPRP grant \# 6-027-2-010 from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the authors.",

year = "2014",

month = may,

doi = "10.1016/j.corsci.2013.12.020",

language = "British English",

volume = "82",

pages = "45--57",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier Ltd",

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TY - JOUR

T1 - Electrochemical behavior of API-X100 pipeline steel in NS4, near-neutral, and mildly alkaline pH simulated soil solutions

AU - Gadala, Ibrahim M.

AU - Alfantazi, Akram

N1 - Funding Information: This publication was made possible by NPRP grant # 6-027-2-010 from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the authors.

PY - 2014/5

Y1 - 2014/5

N2 - The effect of environmental parameters on the electrochemical corrosion of X100 steel in NS4 simulated soil solution is investigated. The parameters examined were pH (4.7-9), purging gas (5% carbon dioxide (CO2)/95% nitrogen (N2), 100% carbon dioxide, and 100% nitrogen), solution temperature (25, 40, and 55°C), bicarbonate (HCO3-) concentration, chloride (Cl-), and sulfate (SO42-). Overall, corrosion rates of the specimens decreased with pH. Sufficient bicarbonate was critical for the passivation of the steel. Higher chloride/sulfate content prevented stable passivation. Impedance results reveal the involvement of adsorption and parallel adsorption-diffusion in near-neutral and mildly alkaline conditions, respectively.

AB - The effect of environmental parameters on the electrochemical corrosion of X100 steel in NS4 simulated soil solution is investigated. The parameters examined were pH (4.7-9), purging gas (5% carbon dioxide (CO2)/95% nitrogen (N2), 100% carbon dioxide, and 100% nitrogen), solution temperature (25, 40, and 55°C), bicarbonate (HCO3-) concentration, chloride (Cl-), and sulfate (SO42-). Overall, corrosion rates of the specimens decreased with pH. Sufficient bicarbonate was critical for the passivation of the steel. Higher chloride/sulfate content prevented stable passivation. Impedance results reveal the involvement of adsorption and parallel adsorption-diffusion in near-neutral and mildly alkaline conditions, respectively.

KW - A. Low alloy steel

KW - B. EIS

KW - B. Polarization

KW - C. Acid corrosion

KW - C. Alkaline corrosion

UR - https://www.scopus.com/pages/publications/84894729019

U2 - 10.1016/j.corsci.2013.12.020

DO - 10.1016/j.corsci.2013.12.020

M3 - Article

AN - SCOPUS:84894729019

SN - 0010-938X

VL - 82

SP - 45

EP - 57

JO - Corrosion Science

JF - Corrosion Science

ER -

Electrochemical behavior of API-X100 pipeline steel in NS4, near-neutral, and mildly alkaline pH simulated soil solutions

Abstract

Keywords

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