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1
Green corrosion inhibitor for mild steel in 2 M HCl solution: flavonoid extract of Erigeron floribundus
100%
Abeng F. E. , Idim V. D.
World Scientific News
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2018
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tom 98
2
Content available Electrochemical and Quantum Chemical Investigation on Adsorption of Nifedipine as Corrosion Inhibitor at API 5L X-52 Steel / HCl Acid Interface
100%
Ikpi M. E. , Abeng F. E.
Archives of Metallurgy and Materials
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2020
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tom Vol. 65, iss. 1
125--131
EN
Nifedipine, a pyridine derivative was investigated as corrosion inhibitor for API 5L X-52 steel in 2 M HCl solution by potentiodynamic polarization, electrochemical impedance spectroscopy and quantum chemical calculations. Statistical tools were used to compare results of the experimental methods. The results showed that nifedipine is capable of inhibiting the corrosion of API 5L X-52 steel in 2 M HCl solution. Potentiodynamic polarization results reveal that nifedipine functions as a mixed-type inhibitor and presents an inhibition efficiency of about 78% at 500 ppm. Impedance data reveal an increasing charge transfer resistance with increasing inhibitor concentration and also shows comparable inhibition efficiency of about 89-94% at 500 ppm. Thermodynamic parameters imply that nifedipine is adsorbed on the steel surface by a physiochemical process and obeys Langmuir adsorption isotherm. The calculated molecular properties namely the highest occupied molecular orbital energy, lowest unoccupied molecular orbital energy, chemical hardness, energy gap, dipole moment, electronegativity and global nucleophilicity index all show a positive relationship to the observed corrosion inhibition efficiency.
3
Content available Experimental and computational study of levofloxacin as corrosion inhibitor for carbon steel in acidic media
80%
Ikpi M. E. , Abeng F. E. , Okonkwo B. O.
World News of Natural Sciences
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2017
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tom 09
EN
The corrosion inhibition behaviour of levofloxacin was investigated on carbon steel by means of a 2 M HCl solution, using potentiodynamic polarization measurement and Quantum chemical studies. The inhibitive effect of the studied compound was found to increase with increasing concentration and to increase with increasing temperature. The study reveals that levofloxacin is a mixed-type corrosion inhibitor. The adsorption of levofloxacin on carbon steel surface obeys the Langmuir adsorption isotherm and involves physical adsorption mechanisms. Quantum chemical studies corroborate experimental results.
4
Content available Kinetics and thermodynamic studies of corrosion inhibition of mild steel using methanolic extract of Erigeron floribundus (Kunth) in 2 m HCl solution
80%
Abeng F. E. , Idim V. D. , Nna P. J.
World News of Natural Sciences
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2017
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tom 10
EN
The investigation of kinetics and thermodynamics of the corrosion of mild steel in a 2 M HCl solution using methanolic extract of Erigeron floribundus was carried out by means of gravimetric techniques. The results obtained indicate that the extract retarded corrosion. The inhibition efficiency was seen to increase with increase in concentration of the inhibitor, as well as with increase in temperature. The values of activation energy (Ea) obtained indicate a chemisorptions mechanism, whereas the value of Gibb free energy (ΔGoads) indicates a spontaneous adsorption of the extract components on the metal surface. Kinetic modelling of the experimental data obeys first order reaction. The adsorption of methanolic extract of Erigeron floribundus onto the mild steel surface followed the Langmuir adsorption isotherm model. Therefore, the extract functions as good corrosion inhibitor for mild steel in hydrochloric acid.
5
Adsorption and adsorption isotherm: application to corrosion inhibition studies of mild steel in 2 M HCl
80%
Abeng F. E. , Idim V. D. , Obono O. E. , Magu T. O.
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nr 2
6
Content available Adsorption and thermodynamic studies for corrosion inhibition of API 5L X-52 steel in 2 M HCl solution by moxifloxacin
80%
Ikpi M. E. , Abeng F. E. , Obono O. E.
World News of Natural Sciences
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2017
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tom 09
EN
The inhibition of API 5L X-52 steel corrosion in an acidic medium by moxifloxacin at 303 K, 313 K and 323 K was monitored by potentiodynamic polarization measurement. The concentration of acid medium was maintained throughout the experiment. The inhibition efficiency was found to increased with increase in concentration of moxifloxacin and temperature. Activation energy, adsorption and thermodynamic parameters were evaluated from the study temperature. Herein, moxifloxacin brought about a decrease in activation energy Ea that reflects chemisorption. The adsorption of the moxifloxacin on the steel surface was found to obeyed Langmuir adsorption isotherm ΔGads values, indicating strong and spontaneous adsorption of the moxifloxacin on the surface of API 5L X-52 steel.
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