A combined electrochemical and theoretical study into the effect of curcumin as a corrosion inhibitor for mild steel in 1 M HCl

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علمي, أحمد "سمير جواد" عبد القادر
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جامعة النجاح الوطنية
The effect of natural curcumin on the mild steel (MS) dissolution in 1.0 M HCl at different temperature (303-333) K has been investigated, the inhibition efficiency decreases with increases in temperature, but increases with increasing concentration of curcumin. Also experimental techniques such as electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP) methods,weight loss measurements,and computational studies. The curcumin showed high inhibition activities and its adsorption on mild steel surface have become studied was found to follow the Langmuir adsorption model. Potentiodynamic polarization results revealed that natural curcumin acts as a mixed-type inhibitor. The results from EIS analysis reveals an increase in charge transfer resistance confirming the inhibitive ability of curcumin. The electronic properties derived from, DFT method and molecular dynamic (MD) simulations were used to give further insights into the action mode of curcumin. Theoretical results correlate well with the experimental results. Surface morphology of the MS surface in absence and presence of natural inhibitor was examined using SEM images, and AFM the average surface roughness was 2.3µm:1.2 µm favoring the curcumin treated MS.