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Effectiveness of henna leaves extract and its derivatives as green corrosion inhibitors of reinforcement steel exposed to chlorides
In this work, Henna leaves extract (HLE) and its principal derivatives of Lawsone and Gallic acid are examined as green corrosion inhibitors. Our contribution is to quantify the effectiveness of HLE, Lawsone and Gallic acid on the corrosion inhibition of steel in simulated concrete pore solution (SCPS) containing 0.5 M NaCl, using electrochemical methods as open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy. In addition, environmental scanning electron microscopy, coupled to the energy dispersive X-ray microanalysis, was performed to investigate the morphology of the steel surface immersed in SCPS containing green inhibitors. Results highlight a synergistic effect with the formation of a protective layer on the steel surface by forming inhibitor-metal complexes. The HLE and Gallic acid act as anodic corrosion inhibitors and Lawsone behaves as a mixed type. These inhibitors are adsorbed on the steel surface by chemisorption according to the adsorption isotherm of Langmuir. The maximal inhibition efficiency is about 93% obtained at 0.2 g/L of HLE, which represents the higher effectiveness compared to Lawsone and Gallic acid.
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Effectiveness of henna leaves extract and its derivatives as green corrosion inhibitors of reinforcement steel exposed to chlorides
In this work, Henna leaves extract (HLE) and its principal derivatives of Lawsone and Gallic acid are examined as green corrosion inhibitors. Our contribution is to quantify the effectiveness of HLE, Lawsone and Gallic acid on the corrosion inhibition of steel in simulated concrete pore solution (SCPS) containing 0.5 M NaCl, using electrochemical methods as open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy. In addition, environmental scanning electron microscopy, coupled to the energy dispersive X-ray microanalysis, was performed to investigate the morphology of the steel surface immersed in SCPS containing green inhibitors. Results highlight a synergistic effect with the formation of a protective layer on the steel surface by forming inhibitor-metal complexes. The HLE and Gallic acid act as anodic corrosion inhibitors and Lawsone behaves as a mixed type. These inhibitors are adsorbed on the steel surface by chemisorption according to the adsorption isotherm of Langmuir. The maximal inhibition efficiency is about 93% obtained at 0.2 g/L of HLE, which represents the higher effectiveness compared to Lawsone and Gallic acid.
<title>Graphical Abstract</title> <fig><graphic></graphic></fig>
Effectiveness of henna leaves extract and its derivatives as green corrosion inhibitors of reinforcement steel exposed to chlorides
Brixi, Nezha Khedoudja (author) / Cherif, Rachid (author) / Bezzar, Abdelillah (author) / Sail, Latefa (author) / Aït-Mokhtar, Abdelkarim (author)
European Journal of Environmental and Civil Engineering ; 26 ; 5912-5930
2022-08-31
19 pages
Article (Journal)
Electronic Resource
Unknown
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