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Aqueous extracts of olive roots, stems, and leaves as eco-friendly corrosion inhibitor for steel in 1 MHCl medium

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Tue, 2015-10-27 16:16 — Ismail Warad
Journal Title, Volume, Page: 
Int J Ind Chem , 10 March 2015 / Accepted: 12 June 2015
Year of Publication: 
2015
Preferred Abstract (Original): 
This work is devoted to examine the effectiveness
of the aqueous extracts of olive (Olea europaea L.)
leaves, roots, and stems on corrosion of mild steel in 1 M
HCl solution using the weight loss measurement at various
temperature and concentration effects. Polarization curves
and electrochemical impedance spectroscopy (EIS) methods
were employed to evaluate corrosion rate and inhibition
efficiency. Corrosion inhibition efficiencies of 89.24,
88.84, and 89.83 % were achieved in 1 M HCl for olive
root extract (ORE), olive stem extract (OSE), and olive leaf
extract (OLE), respectively. It was found that the different
extracts act as a good corrosion inhibitor for the tested
system. The inhibitive action of the extract is discussed
with a view to the adsorption of its components onto the
steel surface which made a barrier to mass and charge

transfer. The adsorption of extract components onto the steel surface was found to be a spontaneous process and increases the activation energy of the corrosion process. The inhibition efficiency is greatly reduced as the temperature increased. Experimental results show that corrosion inhibition efficiency increases with concentration of the sample extract. Polarization studies show that olive leaf, root, and stem extracts act as a mixed inhibitor.