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

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 corro...

Full description

Bibliographic Details
Main Authors:	Gaius Debi Eyu, Geoffrey Will, Willem Dekkers, Jennifer MacLeod
Format:	Article
Language:	English
Published:	MDPI AG 2016-09-01
Series:	Materials
Subjects:	mild steel bicarbonate polarization passivation
Online Access:	http://www.mdpi.com/1996-1944/9/9/748

id	doaj-3fa1e29c11e24279af1a2879873be175
record_format	Article
spelling	doaj-3fa1e29c11e24279af1a2879873be1752020-11-24T22:01:59ZengMDPI AGMaterials1996-19442016-09-019974810.3390/ma9090748ma9090748Effect of Dissolved Oxygen and Immersion Time on the Corrosion Behaviour of Mild Steel in Bicarbonate/Chloride SolutionGaius Debi Eyu0Geoffrey Will1Willem Dekkers2Jennifer MacLeod3Department of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane QLD 4000, AustraliaDepartment of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane QLD 4000, AustraliaDepartment of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane QLD 4000, AustraliaDepartment of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane QLD 4000, AustraliaThe 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.http://www.mdpi.com/1996-1944/9/9/748mild steelbicarbonatepolarizationpassivation
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Gaius Debi Eyu Geoffrey Will Willem Dekkers Jennifer MacLeod
spellingShingle	Gaius Debi Eyu Geoffrey Will Willem Dekkers Jennifer MacLeod Effect of Dissolved Oxygen and Immersion Time on the Corrosion Behaviour of Mild Steel in Bicarbonate/Chloride Solution Materials mild steel bicarbonate polarization passivation
author_facet	Gaius Debi Eyu Geoffrey Will Willem Dekkers Jennifer MacLeod
author_sort	Gaius Debi Eyu
title	Effect of Dissolved Oxygen and Immersion Time on the Corrosion Behaviour of Mild Steel in Bicarbonate/Chloride Solution
title_short	Effect of Dissolved Oxygen and Immersion Time on the Corrosion Behaviour of Mild Steel in Bicarbonate/Chloride Solution
title_full	Effect of Dissolved Oxygen and Immersion Time on the Corrosion Behaviour of Mild Steel in Bicarbonate/Chloride Solution
title_fullStr	Effect of Dissolved Oxygen and Immersion Time on the Corrosion Behaviour of Mild Steel in Bicarbonate/Chloride Solution
title_full_unstemmed	Effect of Dissolved Oxygen and Immersion Time on the Corrosion Behaviour of Mild Steel in Bicarbonate/Chloride Solution
title_sort	effect of dissolved oxygen and immersion time on the corrosion behaviour of mild steel in bicarbonate/chloride solution
publisher	MDPI AG
series	Materials
issn	1996-1944
publishDate	2016-09-01
description	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.
topic	mild steel bicarbonate polarization passivation
url	http://www.mdpi.com/1996-1944/9/9/748
work_keys_str_mv	AT gaiusdebieyu effectofdissolvedoxygenandimmersiontimeonthecorrosionbehaviourofmildsteelinbicarbonatechloridesolution AT geoffreywill effectofdissolvedoxygenandimmersiontimeonthecorrosionbehaviourofmildsteelinbicarbonatechloridesolution AT willemdekkers effectofdissolvedoxygenandimmersiontimeonthecorrosionbehaviourofmildsteelinbicarbonatechloridesolution AT jennifermacleod effectofdissolvedoxygenandimmersiontimeonthecorrosionbehaviourofmildsteelinbicarbonatechloridesolution
_version_	1725837485129334784

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

Similar Items