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Kinetics and Thermodynamic Studies of Corrosion Inhibition of Mild Steel Using Methanolic Extract of Erigeron floribundus (Kunth) in 2 M HCl Solution

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Abeng F. E., Idim V. D., Nna P. J.
World News of Natural Sciences
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2017
|
vol. 10
26-38
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.
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Adsorption and Thermodynamic Studies for Corrosion Inhibition of API 5L X-52 Steel in 2 M HCl Solution by Moxifloxacin

100%
Ikpi M. E., Abeng F. E., Obono O. E.
World News of Natural Sciences
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2017
|
vol. 9
52-61
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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Experimental and computational study of levofloxacin as corrosion inhibitor for carbon steel in acidic media

100%
Ikpi M. E., Abeng F. E., Okonkwo B. O.
World News of Natural Sciences
|
2017
|
vol. 9
79-90
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.
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