Chemical and electrochemical studies of the inhibition performance of hydro-alcoholic extract of used coffee grounds (HECG) for the corrosion of C38 steel in 1M hydrochloric acid

Chemical and electrochemical studies of the inhibition performance of hydro-alcoholic extract of used coffee grounds (HECG) for the corrosion of C38 steel in 1M hydrochloric acid

The corrosion protection of C38 steel in 1M HCl solution with hydro-alcoholic used coffee grounds extract (HECG) was studied using measurements of hydrogen gas evolution, potentiodynamic polarization and electrochemical impedance spectroscopy. This work revealed that the HECG studied acts as a mixed...

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Main Authors: Fatima Bouhlal, Najoua Labjar, Farah Abdoun, Aimad Mazkour, Malika Serghini-Idrissi, Mohammed El Mahi, El Mostapha Lotfi, Abdelmajid Skalli, Souad El Hajjaji
Format: Article
Language:English
Published: Elsevier 2020-03-01
Series:Egyptian Journal of Petroleum
Online Access:http://www.sciencedirect.com/science/article/pii/S1110062119302041
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spelling doaj-2110aa7c737b46ec8ad058e09009d6ee2020-11-25T03:24:54ZengElsevierEgyptian Journal of Petroleum1110-06212020-03-012914552Chemical and electrochemical studies of the inhibition performance of hydro-alcoholic extract of used coffee grounds (HECG) for the corrosion of C38 steel in 1M hydrochloric acidFatima Bouhlal0Najoua Labjar1Farah Abdoun2Aimad Mazkour3Malika Serghini-Idrissi4Mohammed El Mahi5El Mostapha Lotfi6Abdelmajid Skalli7Souad El Hajjaji8Laboratory of Spectroscopy, Molecular Modeling, Materials, Nanomaterials, Water and Environment, CERN2D, ENSET, Mohamed V University, Rabat, MoroccoLaboratory of Spectroscopy, Molecular Modeling, Materials, Nanomaterials, Water and Environment, CERN2D, ENSET, Mohamed V University, Rabat, Morocco; Corresponding author.Center STIS, M2CS, ENSET, Mohammed V University, Rabat, MoroccoLaboratory of Spectroscopy, Molecular Modeling, Materials, Nanomaterials, Water and Environment, CERN2D, Faculty of Sciences, Mohamed V University, Rabat, MoroccoLaboratory of Spectroscopy, Molecular Modeling, Materials, Nanomaterials, Water and Environment, CERN2D, Faculty of Sciences, Mohamed V University, Rabat, MoroccoLaboratory of Spectroscopy, Molecular Modeling, Materials, Nanomaterials, Water and Environment, CERN2D, ENSET, Mohamed V University, Rabat, MoroccoLaboratory of Spectroscopy, Molecular Modeling, Materials, Nanomaterials, Water and Environment, CERN2D, ENSET, Mohamed V University, Rabat, MoroccoLaboratory of Spectroscopy, Molecular Modeling, Materials, Nanomaterials, Water and Environment, CERN2D, ENSET, Mohamed V University, Rabat, MoroccoLaboratory of Spectroscopy, Molecular Modeling, Materials, Nanomaterials, Water and Environment, CERN2D, Faculty of Sciences, Mohamed V University, Rabat, MoroccoThe corrosion protection of C38 steel in 1M HCl solution with hydro-alcoholic used coffee grounds extract (HECG) was studied using measurements of hydrogen gas evolution, potentiodynamic polarization and electrochemical impedance spectroscopy. This work revealed that the HECG studied acts as a mixed type inhibitor. It has also been shown that the corrosion inhibition efficiency (IE) increases with increasing extract concentration, an IE value of 97.4% was reached with 2 g/L HECG. The inhibitory action of the inhibitor was mainly due to the adsorption of HECG molecules on the C38 steel surface. The studies have shown that HECG adsorbs on the C38 steel surface according to Langmuir's isotherm, with a standard free energy (ΔG0ads) of −18,477 KJ mol−1, which means that HECG delays the corrosion process by physical adsorption. The scanning electron microscope (SEM) study confirmed that corrosion inhibition of C38 steel occurs by adsorption of inhibiting molecules on the metal surface. These results show that the HECG can be used as an excellent corrosion inhibitor for C38 steel in a hydrochloric acid medium. Keywords: Hydro-alcoholic extract of coffee grounds, C38 steel, Hydrochloric acid, Adsorption, Electrochemical impedance, Polarisation curveshttp://www.sciencedirect.com/science/article/pii/S1110062119302041
collection DOAJ
language English
format Article
sources DOAJ
author Fatima Bouhlal
Najoua Labjar
Farah Abdoun
Aimad Mazkour
Malika Serghini-Idrissi
Mohammed El Mahi
El Mostapha Lotfi
Abdelmajid Skalli
Souad El Hajjaji
spellingShingle Fatima Bouhlal
Najoua Labjar
Farah Abdoun
Aimad Mazkour
Malika Serghini-Idrissi
Mohammed El Mahi
El Mostapha Lotfi
Abdelmajid Skalli
Souad El Hajjaji
Chemical and electrochemical studies of the inhibition performance of hydro-alcoholic extract of used coffee grounds (HECG) for the corrosion of C38 steel in 1M hydrochloric acid
Egyptian Journal of Petroleum
author_facet Fatima Bouhlal
Najoua Labjar
Farah Abdoun
Aimad Mazkour
Malika Serghini-Idrissi
Mohammed El Mahi
El Mostapha Lotfi
Abdelmajid Skalli
Souad El Hajjaji
author_sort Fatima Bouhlal
title Chemical and electrochemical studies of the inhibition performance of hydro-alcoholic extract of used coffee grounds (HECG) for the corrosion of C38 steel in 1M hydrochloric acid
title_short Chemical and electrochemical studies of the inhibition performance of hydro-alcoholic extract of used coffee grounds (HECG) for the corrosion of C38 steel in 1M hydrochloric acid
title_full Chemical and electrochemical studies of the inhibition performance of hydro-alcoholic extract of used coffee grounds (HECG) for the corrosion of C38 steel in 1M hydrochloric acid
title_fullStr Chemical and electrochemical studies of the inhibition performance of hydro-alcoholic extract of used coffee grounds (HECG) for the corrosion of C38 steel in 1M hydrochloric acid
title_full_unstemmed Chemical and electrochemical studies of the inhibition performance of hydro-alcoholic extract of used coffee grounds (HECG) for the corrosion of C38 steel in 1M hydrochloric acid
title_sort chemical and electrochemical studies of the inhibition performance of hydro-alcoholic extract of used coffee grounds (hecg) for the corrosion of c38 steel in 1m hydrochloric acid
publisher Elsevier
series Egyptian Journal of Petroleum
issn 1110-0621
publishDate 2020-03-01
description The corrosion protection of C38 steel in 1M HCl solution with hydro-alcoholic used coffee grounds extract (HECG) was studied using measurements of hydrogen gas evolution, potentiodynamic polarization and electrochemical impedance spectroscopy. This work revealed that the HECG studied acts as a mixed type inhibitor. It has also been shown that the corrosion inhibition efficiency (IE) increases with increasing extract concentration, an IE value of 97.4% was reached with 2 g/L HECG. The inhibitory action of the inhibitor was mainly due to the adsorption of HECG molecules on the C38 steel surface. The studies have shown that HECG adsorbs on the C38 steel surface according to Langmuir's isotherm, with a standard free energy (ΔG0ads) of −18,477 KJ mol−1, which means that HECG delays the corrosion process by physical adsorption. The scanning electron microscope (SEM) study confirmed that corrosion inhibition of C38 steel occurs by adsorption of inhibiting molecules on the metal surface. These results show that the HECG can be used as an excellent corrosion inhibitor for C38 steel in a hydrochloric acid medium. Keywords: Hydro-alcoholic extract of coffee grounds, C38 steel, Hydrochloric acid, Adsorption, Electrochemical impedance, Polarisation curves
url http://www.sciencedirect.com/science/article/pii/S1110062119302041
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