scholarly journals Monitoring the Interaction of Two Heterocyclic Compounds on Carbon Steel by Electrochemical Polarization, Noise, and Quantum Chemical Studies

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Vinod P. Raphael ◽  
Shaju K. Shanmughan ◽  
Joby Thomas Kakkassery
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibition ◽  
Quantum Chemical ◽  
Reduced Form ◽  
Chemical Hardness ◽  
Corrosion Monitoring ◽  
Chemical Studies ◽  
Quantum Chemical Studies ◽  
Homo And Lumo ◽  
Methyl Pyridine

A heterocyclic phenylhydrazone 2-[(E)-(2-phenylhydrazinylidene)methyl]pyridine (P2APH) and its reduced form 2-[(2-phenylhydrazinyl)methyl]pyridine (RP2APH) were synthesized, characterized, and subjected to corrosion inhibition investigation on carbon steel (CS) in 1 M HCl using gravimetric, polarization, electrochemical noise, quantum chemical, and surface studies. P2APH showed more inhibition capacity than RP2PPH. But RP2PPH was very stable in acid medium and showed pronounced corrosion inhibition efficacy for days. Energy of HOMO and LUMO, their difference, number of electrons transferred, electronegativity, chemical hardness, and so forth were evaluated by quantum chemical studies. Agreeable correlation was observed between the results of quantum chemical calculations and other corrosion monitoring techniques.

Electrochemical and Quantum Chemical Studies on the Corrosion Inhibition Potential of Camellia sinensis Leaves Extract for Carbon Steel in Produced Water

2017 ◽  
Vol 232 (1) ◽  
Author(s):  
F. El-Taib Heakal ◽  
M.M. Osman ◽  
M.A. Deyab ◽  
A.E. Elkholy
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibition ◽  
Camellia Sinensis ◽  
Quantum Chemical ◽  
Mixed Type ◽  
Produced Water ◽  
Electrochemical Impedance ◽  
Computational Study ◽  
Chemical Studies ◽  
Quantum Chemical Studies

AbstractThe present study evaluates the effect of Camellia sinensis leaves (CSL) extract on the corrosion inhibition of carbon steel in produced water using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and computational methods. The chromatographic investigation of the extract was performed by HPLC. It was found that CSL extract serves as a mixed-type corrosion inhibitor and its inhibitive performance increases with concentration. The corrosion inhibition was assumed to occur via adsorption of the primary constituents of CSL extract. Surface analysis (SEM and FTIR) was also carried out to establish the mechanism of corrosion inhibition. The outcomes obtained from the computational study were found to confirm experimental data.

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