Comparative studies on the corrosion inhibition efficacy of ethanolic extracts of date palm leaves and seeds on carbon steel corrosion in 15% HCl solution
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The work reports on the study carried out to comparatively assess the corrosion
inhibition efficacy of crude ethanolic extracts of date palm leaves and seeds on X60
carbon steel corrosion in 15% HCl solution at 25–60 °C. The corrosion inhibition studies
was carried out using weight loss and electrochemical (potentiodynamic polarization
and linear polarization resistance) techniques. Preliminary phytochemical screening was
performed in order to determine the phytoconstituents present in the crude extracts. The
influence of extractive solvents on the corrosion inhibition performance of the extracts
was also investigated. It is found that the crude extracts of both date palm leaves and
seeds contain saponins, flavonoids, cardiac glycosides and reducing sugars. Tannins is
only present in the leaves and absent in the seeds while anthraquinones is absent in
both extracts. The crude ethanolic extracts inhibited the corrosion of X60 steel in the
aggressive 15% HCl solution with the leaves extract showing superior performance.
Inhibition efficiency increased with increase in concentration of the extracts and
temperature. Potentiodynamic polarization results reveal that the extracts function as
mixed type inhibitors. Corrosion inhibition occurs by virtue of adsorption of components
of the extract on the steel surface and was found to follow Langmuir adsorption
isotherm model. On the influence of the extractive solvents on the corrosion inhibition
performance, the order of inhibition efficiency at 60 °C follows the trend DPLAE (73.6%)
> DPLEE (62.5%) > DPSAE (59.9%) > DPSEE (55.9%) with the optimum extract
concentration (2000 ppm) studied.
Keywords
QD Chemistry