Effect of Dissolved Oxygen and Immersion Time on the Corrosion Behaviour of Mild Steel in Bicarbonate/Chloride Solution

Gaius Debi Eyu; Geoffrey Will; Willem Dekkers; Jennifer MacLeod

doi:10.3390/ma9090748

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Effect of Dissolved Oxygen and Immersion Time on the Corrosion Behaviour of Mild Steel in Bicarbonate/Chloride Solution

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Effect of Dissolved Oxygen and Immersion Time on the Corrosion Behaviour of Mild Steel in Bicarbonate/Chloride Solution

Gaius Debi Eyu, Geoffrey Will, Willem Dekkers and Jennifer MacLeod

Materials, Vol.9(9), pp.1-18

2016

DOI: https://doi.org/10.3390/ma9090748

PMCID: PMC5457075

PMID: 28773870

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Abstract

mild steel

bicarbonate

polarization

passivation

The electrochemical behavior of mild steel in bicarbonate solution at different dissolved oxygen (DO) concentrations and immersion times has been studied under dynamic conditions using electrochemical techniques. The results show that both DO and immersion times influence the morphology of the corrosion products. In comparative tests, the corrosion rate was systematically found to be lower in solutions with lower DO, lower HCO3− concentrations and longer immersion time. The SEM analyses reveal that the iron dissolution rate was more severe in solutions containing higher DO. The decrease in corrosion rate can be attributed to the formation of a passive layer containing mainly α-FeO (OH) and (γ-Fe2O3/Fe3O4) as confirmed by the X-ray diffractometry (XRD) and X-ray photoelectron spectroscopy (XPS). Passivation of mild steel is evident in electrochemical test at ≈ −600 mVSCE at pH ≥ 8 in dearated ( ≤ 0.8 ppm DO) chloride bicarbonate solution under dynamic conditions.

Details

Title: Effect of Dissolved Oxygen and Immersion Time on the Corrosion Behaviour of Mild Steel in Bicarbonate/Chloride Solution
Authors: Gaius Debi Eyu (Corresponding Author) - Queensland University of Technology
Geoffrey Will (Author) - Queensland University of Technology
Willem Dekkers (Author) - Queensland University of Technology
Jennifer MacLeod (Author) - Queensland University of Technology
Publication details: Materials, Vol.9(9), pp.1-18
Publisher: MDPI AG
Date published: 2016
DOI: 10.3390/ma9090748
ISSN: 1996-1944
PMID: 28773870; PMC5457075
Copyright note: Copyright © 2016 by the authors; Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
Grant note: This work was funded by the Australian Government and Queensland University of Technology. The authors express their gratitude for the financial support and some characterizations performed at the Central Analytical Research Facility (CARF) operated by the Institute for Future Environments (QUT).
Organisation Unit: School of Science, Technology and Engineering
Language: English
Record Identifier: 99737997102621
Output Type: Journal article

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Web Of Science research areas: Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter