The Synergistic Effect of Iodide and Sodium Nitrite on the Corrosion Inhibition of Mild Steel in Bicarbonate-Chloride Solution

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

doi:10.3390/ma9110868

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The Synergistic Effect of Iodide and Sodium Nitrite on the Corrosion Inhibition of Mild Steel in Bicarbonate-Chloride Solution

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The Synergistic Effect of Iodide and Sodium Nitrite on the Corrosion Inhibition of Mild Steel in Bicarbonate-Chloride Solution

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

Materials, Vol.9(11), pp.1-14

2016

DOI: https://doi.org/10.3390/ma9110868

PMCID: PMC5457186

PMID: 28773991

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Abstract

mild steel

bicarbonate solution

polarization

EIS

iodide ion

passivation

The effect of potassium iodide (KI) and sodium nitrite (NaNO2 inhibitor on the corrosion inhibition of mild steel in chloride bicarbonate solution has been studied using electrochemical techniques. Potentiodynamic polarisation data suggest that, when used in combination, KI and NaNO2 function together to inhibit reactions at both the anode and the cathode, but predominantly anodic. KI/NO2- concentration ratios varied from 2:1 to 2:5; inhibition efficiency was optimized for a ratio of 1:1. The surface morphology and corrosion products were analysed using scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The latter shows that the addition of I to NO2 facilitates the formation of a passivating oxide (gamma-Fe2O3) as compared to NO2 alone, decreasing the rate of metal dissolution observed in electrochemical testing. The synergistic effect of KI/NO2 inhibition was enhanced under the dynamic conditions associated with testing in a rotating disc electrode.

Details

Title: The Synergistic Effect of Iodide and Sodium Nitrite on the Corrosion Inhibition 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(11), pp.1-14
Publisher: MDPI AG
Date published: 2016
DOI: 10.3390/ma9110868
ISSN: 1996-1944
PMID: 28773991; PMC5457186
Copyright note: © 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/).
Organisation Unit: School of Science, Technology and Engineering
Language: English
Record Identifier: 99737877502621
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