Adsorption characteristics of green 5-arylaminomethylene pyrimidine- 2,4,6-triones on mild steel surface in acidic medium: Experimental and computational approach
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Date
2018-01-10
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier B.V
Abstract
The effect of electron withdrawing nitro (–NO2) and electron releasing hydroxyl (–OH) groups on corrosion inhibition potentials of 5-arylaminomethylenepyrimidine-2,4,6-trione (AMP) had been studied. Four AMPs tagged AMP-1, AMP-2, AMP-3 and AMP-4 were studied for their ability to inhibit mild steel corrosion
in 1 M HCl using experimental and theoretical methods. Gravimetric results showed that inhibition
efficiency of the studied inhibitors increases with increasing concentration. The results further revealed
that that electron withdrawing nitro (–NO2) group decreases the inhibition efficiency of AMP, while electron donating hydroxyl (–OH) group increases the inhibition efficiency of AMP. SEM and AFM studies showed that the studied compounds inhibit mild steel corrosion by adsorbing at the metal/electrolyte interface and their adsorption obeyed the Temkin adsorption isotherm. Potentiodynamic polarization
study revealed that studied inhibitors act as mixed type inhibitors with predominant effect on cathodic
reaction. The inhibitive strength of the compounds might have direct relationship electron donating ability of the molecules as revealed by quantum chemical parameters. The order of interaction energies derived from Monte Carlo simulations is AMP-4 > AMP-3 > AMP-2 > AMP-1, which is in agreement with the order of inhibition efficiencies obtained from experimental measurements.
Description
Results in Physics, 8 (2018) 657–670
Keywords
Langmuir adsorption isotherm, Theoretical studies, Acid solutions, Multicomponent reactions, Green corrosion inhibitors