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Electrochemical and Computational Insights on the Application of Expired Metformin Drug as a Novel Inhibitor for the Sweet Corrosion of C1018 Steel
[Image: see text] An expired metformin drug (MET) was used as a corrosion inhibitor for C1018 carbon steel in a CO(2)-saturated 3.5 wt % NaCl + 340 ppm acetic acid solution under static conditions. The inhibitor was evaluated using electrochemical methods complemented with surface analytical measure...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2020
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7807467/ https://www.ncbi.nlm.nih.gov/pubmed/33458460 http://dx.doi.org/10.1021/acsomega.0c03364 |
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author | Onyeachu, Ikenna B. Abdel-Azeim, Safwat Chauhan, Dheeraj Singh Quraishi, Mumtaz A. |
author_facet | Onyeachu, Ikenna B. Abdel-Azeim, Safwat Chauhan, Dheeraj Singh Quraishi, Mumtaz A. |
author_sort | Onyeachu, Ikenna B. |
collection | PubMed |
description | [Image: see text] An expired metformin drug (MET) was used as a corrosion inhibitor for C1018 carbon steel in a CO(2)-saturated 3.5 wt % NaCl + 340 ppm acetic acid solution under static conditions. The inhibitor was evaluated using electrochemical methods complemented with surface analytical measurements and computational modeling. The drug displayed a high inhibition efficiency of ∼90% at 200 ppm. Impedance analyses revealed a rise in the charge transfer resistance at the steel–solution interface upon the addition of the inhibitor. Polarization measurements suggested that MET acted more like a cathodic-type corrosion inhibitor and significantly reduced the corrosion current density. The adsorption of MET on the steel substrate followed the Langmuir isotherm, showing a mixed type of physical and chemical modes of adsorption. The thermodynamic parameters revealed strong and spontaneous adsorption on the steel surface. The surface analysis using SEM supported the inhibitor adsorption on the steel substrate. Based on the DFT simulation, inhibition by MET is mainly achieved by its protonated form, which leads to the formation of a thin film on the steel surface rather than the modification of the work function of the steel surface. The experimental and theoretical estimations of pKa complemented the DFT results, both agreeing that the monoprotonated form of MET is the dominant form in which the inhibitor adsorbs on the steel surface to form a thin film rather than modify the work function of the steel surface. |
format | Online Article Text |
id | pubmed-7807467 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-78074672021-01-15 Electrochemical and Computational Insights on the Application of Expired Metformin Drug as a Novel Inhibitor for the Sweet Corrosion of C1018 Steel Onyeachu, Ikenna B. Abdel-Azeim, Safwat Chauhan, Dheeraj Singh Quraishi, Mumtaz A. ACS Omega [Image: see text] An expired metformin drug (MET) was used as a corrosion inhibitor for C1018 carbon steel in a CO(2)-saturated 3.5 wt % NaCl + 340 ppm acetic acid solution under static conditions. The inhibitor was evaluated using electrochemical methods complemented with surface analytical measurements and computational modeling. The drug displayed a high inhibition efficiency of ∼90% at 200 ppm. Impedance analyses revealed a rise in the charge transfer resistance at the steel–solution interface upon the addition of the inhibitor. Polarization measurements suggested that MET acted more like a cathodic-type corrosion inhibitor and significantly reduced the corrosion current density. The adsorption of MET on the steel substrate followed the Langmuir isotherm, showing a mixed type of physical and chemical modes of adsorption. The thermodynamic parameters revealed strong and spontaneous adsorption on the steel surface. The surface analysis using SEM supported the inhibitor adsorption on the steel substrate. Based on the DFT simulation, inhibition by MET is mainly achieved by its protonated form, which leads to the formation of a thin film on the steel surface rather than the modification of the work function of the steel surface. The experimental and theoretical estimations of pKa complemented the DFT results, both agreeing that the monoprotonated form of MET is the dominant form in which the inhibitor adsorbs on the steel surface to form a thin film rather than modify the work function of the steel surface. American Chemical Society 2020-12-23 /pmc/articles/PMC7807467/ /pubmed/33458460 http://dx.doi.org/10.1021/acsomega.0c03364 Text en This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License (http://pubs.acs.org/page/policy/authorchoice_ccbyncnd_termsofuse.html) , which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes. |
spellingShingle | Onyeachu, Ikenna B. Abdel-Azeim, Safwat Chauhan, Dheeraj Singh Quraishi, Mumtaz A. Electrochemical and Computational Insights on the Application of Expired Metformin Drug as a Novel Inhibitor for the Sweet Corrosion of C1018 Steel |
title | Electrochemical and Computational Insights on the
Application of Expired Metformin Drug as a Novel Inhibitor for the
Sweet Corrosion of C1018 Steel |
title_full | Electrochemical and Computational Insights on the
Application of Expired Metformin Drug as a Novel Inhibitor for the
Sweet Corrosion of C1018 Steel |
title_fullStr | Electrochemical and Computational Insights on the
Application of Expired Metformin Drug as a Novel Inhibitor for the
Sweet Corrosion of C1018 Steel |
title_full_unstemmed | Electrochemical and Computational Insights on the
Application of Expired Metformin Drug as a Novel Inhibitor for the
Sweet Corrosion of C1018 Steel |
title_short | Electrochemical and Computational Insights on the
Application of Expired Metformin Drug as a Novel Inhibitor for the
Sweet Corrosion of C1018 Steel |
title_sort | electrochemical and computational insights on the
application of expired metformin drug as a novel inhibitor for the
sweet corrosion of c1018 steel |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7807467/ https://www.ncbi.nlm.nih.gov/pubmed/33458460 http://dx.doi.org/10.1021/acsomega.0c03364 |
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