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KI effects on corrosion inhibition for 1018 steel in acid media using Medicago sativa

Medicago sativa (M. sativa) extract is a safe and eco-friendly corrosion inhibitor of 1018 steel in acid media. The inhibitor reached a maximum efficiency of 85% by using 500 ppm. In this work, we study the use of KI as an add-on to increase the inhibition efficiency of M. sativa, as well as making...

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Autores principales: Rodríguez-Torres, A., Valladares-Cisneros, M. G., Saldaña Heredia, A., González-Rodríguez, J. G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9685335/
https://www.ncbi.nlm.nih.gov/pubmed/36438865
http://dx.doi.org/10.3389/fchem.2022.1032522
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author Rodríguez-Torres, A.
Valladares-Cisneros, M. G.
Saldaña Heredia, A.
González-Rodríguez, J. G.
author_facet Rodríguez-Torres, A.
Valladares-Cisneros, M. G.
Saldaña Heredia, A.
González-Rodríguez, J. G.
author_sort Rodríguez-Torres, A.
collection PubMed
description Medicago sativa (M. sativa) extract is a safe and eco-friendly corrosion inhibitor of 1018 steel in acid media. The inhibitor reached a maximum efficiency of 85% by using 500 ppm. In this work, we study the use of KI as an add-on to increase the inhibition efficiency of M. sativa, as well as making the natural inhibitor competitive with the commercial ones. We evaluated the effect of halide ions through the variation of different concentrations of KI and its synergy with the extract of M. sativa as a corrosion inhibitor of carbon steel in 0.5 M sulfuric acid and at different temperatures. The results were obtained through electrochemical techniques such as electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP) curves, and weight loss gravimetric technique. It was found that halide ions increase the inhibition efficiency of M. sativa from 85 to 95% when 5 mM concentration of KI was used. The efficiency of the inhibition increases proportionally with the immersion time but reduces when the temperature increases. The addition of iodide ions (I−) revealed that it exerts a synergistic effect on the inhibition of corrosion with the extract of M. sativa. However, when studying the metal surface using a scanning electron microscope, pitting corrosion was found.
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spelling pubmed-96853352022-11-25 KI effects on corrosion inhibition for 1018 steel in acid media using Medicago sativa Rodríguez-Torres, A. Valladares-Cisneros, M. G. Saldaña Heredia, A. González-Rodríguez, J. G. Front Chem Chemistry Medicago sativa (M. sativa) extract is a safe and eco-friendly corrosion inhibitor of 1018 steel in acid media. The inhibitor reached a maximum efficiency of 85% by using 500 ppm. In this work, we study the use of KI as an add-on to increase the inhibition efficiency of M. sativa, as well as making the natural inhibitor competitive with the commercial ones. We evaluated the effect of halide ions through the variation of different concentrations of KI and its synergy with the extract of M. sativa as a corrosion inhibitor of carbon steel in 0.5 M sulfuric acid and at different temperatures. The results were obtained through electrochemical techniques such as electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP) curves, and weight loss gravimetric technique. It was found that halide ions increase the inhibition efficiency of M. sativa from 85 to 95% when 5 mM concentration of KI was used. The efficiency of the inhibition increases proportionally with the immersion time but reduces when the temperature increases. The addition of iodide ions (I−) revealed that it exerts a synergistic effect on the inhibition of corrosion with the extract of M. sativa. However, when studying the metal surface using a scanning electron microscope, pitting corrosion was found. Frontiers Media S.A. 2022-11-10 /pmc/articles/PMC9685335/ /pubmed/36438865 http://dx.doi.org/10.3389/fchem.2022.1032522 Text en Copyright © 2022 Rodríguez-Torres, Valladares-Cisneros, Saldaña Heredia and González-Rodríguez. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Chemistry
Rodríguez-Torres, A.
Valladares-Cisneros, M. G.
Saldaña Heredia, A.
González-Rodríguez, J. G.
KI effects on corrosion inhibition for 1018 steel in acid media using Medicago sativa
title KI effects on corrosion inhibition for 1018 steel in acid media using Medicago sativa
title_full KI effects on corrosion inhibition for 1018 steel in acid media using Medicago sativa
title_fullStr KI effects on corrosion inhibition for 1018 steel in acid media using Medicago sativa
title_full_unstemmed KI effects on corrosion inhibition for 1018 steel in acid media using Medicago sativa
title_short KI effects on corrosion inhibition for 1018 steel in acid media using Medicago sativa
title_sort ki effects on corrosion inhibition for 1018 steel in acid media using medicago sativa
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9685335/
https://www.ncbi.nlm.nih.gov/pubmed/36438865
http://dx.doi.org/10.3389/fchem.2022.1032522
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