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

Driss Bouknana,Abdelouahad Aouniti,Shehdeh Jodeh,Hana Serghini Caid,Belkheir Hammouti,Abdelhamid Bouyanzer,Ismail Warad

doi:10.1007/s40090-015-0042-z

Driss Bouknana, Abdelouahad Aouniti + Show 5 more

Open Access

https://doi.org/10.1007/s40090-015-0042-z

Copy DOI

Abstract

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.

Highlights

The environmental toxicity of organic corrosion inhibitors has prompted the search for green corrosion inhibitors as they are biodegradable and do not contain heavy metals or other toxic compounds
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
1M 1.0 9 10-5 1.1 9 10-5 1.2 9 10-5 1.3 9 10-5 1.4 9 10-5 1.0 9 10-5 1.1 9 10-5 1.2 9 10-5 1.3 9 10-5 1.4 9 10-5 1.0 9 10-5 1.1 9 10-5 1.2 9 10-5 1.3 9 10-5 1.4 9 10-5. Those data reveal that the rate of carbon steel corrosion is greatly reduced upon the addition of the selected three inhibitors of olive sample extracts and decreases with the inhibitor concentration due to the fact that the adsorption coverage increases, which shields the steel surface efficiently from the acid solution

Summary

Introduction

The environmental toxicity of organic corrosion inhibitors has prompted the search for green corrosion inhibitors as they are biodegradable and do not contain heavy metals or other toxic compounds. As in addition to being environmentally friendly and ecologically acceptable, plant products are inexpensive, readily available, and renewable. In the olive tree cultivation, the harvesting of olive fruit and the pruning of olive trees generate an important number and large amounts of byproducts such as leaves, twigs, and stems in farms. These solid wastes are a result of pruning or defoliation of olive fruits prior to processing and accumulating in the olive oil industries [18]

Methods

Results

Conclusion