Formation and evolution of oxide/ oxyhydroxide corrosion products on low-alloy steel during exposure to near-neutral pH solutions containing oxygen and nitrate

Ibrahim M. Gadala; Hung M. Ha; Paul Rostron; Akram Alfantazi

doi:10.5006/2070

Formation and evolution of oxide/ oxyhydroxide corrosion products on low-alloy steel during exposure to near-neutral pH solutions containing oxygen and nitrate

Ibrahim M. Gadala
, Hung M. Ha
, Paul Rostron
, Akram Alfantazi

The University of British Columbia

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

1 Scopus citations

Abstract

The evolution of corrosion product and the transient behavior of corrosion during the first 24 h of low-alloy steel exposure to near-neutral pH solutions containing O₂ and NO⁻₃ are investigated in this work through periodic electrochemical polarization, spectroscopy, and characterization techniques. The formation of porous FeOOH products occurs a few hours following immersion, with morphologies distinctly dependent on O₂ concentration. O₂ diffusion is less in the FeOOH tubercle formations formed in 20 ppm O₂ conditions, whereas the presence of Fe₂O₃ is exclusive to corrosion products of 6 ppm O₂ environments. Charge transfer on the compounds involved governs corrosion protectiveness trends of the overall multi-layered product and reaction kinetics at sub-tubercle surface sites. Atypical 0.005 M and 0.015 M NO⁻₃ presence in the environment minimizes the cathodic potential range of O₂ reduction and intensifies the corrosion of the low-alloy steel specimen. The chronology of corrosion product evolution is corroborated with x-ray photoelectron spectroscopy, Raman spectroscopy, and x-ray diffraction, while critical interactions of dissolved species with developed surface layers are quantified with electrochemical impedance spectroscopy.

Original language	British English
Pages (from-to)	221-237
Number of pages	17
Journal	Corrosion
Volume	73
Issue number	3
DOIs	https://doi.org/10.5006/2070
State	Published - Mar 2017

Keywords

Diffusion
Electrochemical impedance spectroscopy
Oxides
Porosity
Raman spectroscopy
Steel
X-ray diffraction

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@article{f652d16b84694f47aa06481d25c1ceed,

title = "Formation and evolution of oxide/ oxyhydroxide corrosion products on low-alloy steel during exposure to near-neutral pH solutions containing oxygen and nitrate",

abstract = "The evolution of corrosion product and the transient behavior of corrosion during the first 24 h of low-alloy steel exposure to near-neutral pH solutions containing O2 and NO−3 are investigated in this work through periodic electrochemical polarization, spectroscopy, and characterization techniques. The formation of porous FeOOH products occurs a few hours following immersion, with morphologies distinctly dependent on O2 concentration. O2 diffusion is less in the FeOOH tubercle formations formed in 20 ppm O2 conditions, whereas the presence of Fe2O3 is exclusive to corrosion products of 6 ppm O2 environments. Charge transfer on the compounds involved governs corrosion protectiveness trends of the overall multi-layered product and reaction kinetics at sub-tubercle surface sites. Atypical 0.005 M and 0.015 M NO−3 presence in the environment minimizes the cathodic potential range of O2 reduction and intensifies the corrosion of the low-alloy steel specimen. The chronology of corrosion product evolution is corroborated with x-ray photoelectron spectroscopy, Raman spectroscopy, and x-ray diffraction, while critical interactions of dissolved species with developed surface layers are quantified with electrochemical impedance spectroscopy.",

keywords = "Diffusion, Electrochemical impedance spectroscopy, Oxides, Porosity, Raman spectroscopy, Steel, X-ray diffraction",

author = "Gadala, \{Ibrahim M.\} and Ha, \{Hung M.\} and Paul Rostron 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. Publisher Copyright: {\textcopyright} 2017, NACE International",

year = "2017",

month = mar,

doi = "10.5006/2070",

language = "British English",

volume = "73",

pages = "221--237",

journal = "Corrosion",

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AU - Gadala, Ibrahim M.

AU - Ha, Hung M.

AU - Rostron, Paul

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. Publisher Copyright: © 2017, NACE International

PY - 2017/3

Y1 - 2017/3

N2 - The evolution of corrosion product and the transient behavior of corrosion during the first 24 h of low-alloy steel exposure to near-neutral pH solutions containing O2 and NO−3 are investigated in this work through periodic electrochemical polarization, spectroscopy, and characterization techniques. The formation of porous FeOOH products occurs a few hours following immersion, with morphologies distinctly dependent on O2 concentration. O2 diffusion is less in the FeOOH tubercle formations formed in 20 ppm O2 conditions, whereas the presence of Fe2O3 is exclusive to corrosion products of 6 ppm O2 environments. Charge transfer on the compounds involved governs corrosion protectiveness trends of the overall multi-layered product and reaction kinetics at sub-tubercle surface sites. Atypical 0.005 M and 0.015 M NO−3 presence in the environment minimizes the cathodic potential range of O2 reduction and intensifies the corrosion of the low-alloy steel specimen. The chronology of corrosion product evolution is corroborated with x-ray photoelectron spectroscopy, Raman spectroscopy, and x-ray diffraction, while critical interactions of dissolved species with developed surface layers are quantified with electrochemical impedance spectroscopy.

AB - The evolution of corrosion product and the transient behavior of corrosion during the first 24 h of low-alloy steel exposure to near-neutral pH solutions containing O2 and NO−3 are investigated in this work through periodic electrochemical polarization, spectroscopy, and characterization techniques. The formation of porous FeOOH products occurs a few hours following immersion, with morphologies distinctly dependent on O2 concentration. O2 diffusion is less in the FeOOH tubercle formations formed in 20 ppm O2 conditions, whereas the presence of Fe2O3 is exclusive to corrosion products of 6 ppm O2 environments. Charge transfer on the compounds involved governs corrosion protectiveness trends of the overall multi-layered product and reaction kinetics at sub-tubercle surface sites. Atypical 0.005 M and 0.015 M NO−3 presence in the environment minimizes the cathodic potential range of O2 reduction and intensifies the corrosion of the low-alloy steel specimen. The chronology of corrosion product evolution is corroborated with x-ray photoelectron spectroscopy, Raman spectroscopy, and x-ray diffraction, while critical interactions of dissolved species with developed surface layers are quantified with electrochemical impedance spectroscopy.

KW - Diffusion

KW - Electrochemical impedance spectroscopy

KW - Oxides

KW - Porosity

KW - Raman spectroscopy

KW - Steel

KW - X-ray diffraction

UR - https://www.scopus.com/pages/publications/85070891984

U2 - 10.5006/2070

DO - 10.5006/2070

M3 - Article

AN - SCOPUS:85070891984

SN - 0010-9312

VL - 73

SP - 221

EP - 237

JO - Corrosion

JF - Corrosion

IS - 3

ER -

Formation and evolution of oxide/ oxyhydroxide corrosion products on low-alloy steel during exposure to near-neutral pH solutions containing oxygen and nitrate

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