Corrosion Inhibition Efficiency of Ghars Date Extract on API 5L X70 Pipeline Steel in Hydrochloric Acid

Abstract

The inability to produce raw materials in sufficient quantities, such as fruits, plants, pigments and resins, to manufacture green inhibitors is considered one of the biggest reasons that hinder the commercial use of these eco-friendly inhibitors. In Asia and Africa, date fruit is produced in large quantities. This fruit contains polysaccharides (primarily galacturonic acid) that can be used as a green inhibitor. The inhibition effect of Ghars date extract (GDE) on the corrosion of API 5L X70 pipeline steel in 0.5 M HCl solution was studied for the first time using electrochemical impedance spectroscopy, potentiodynamic polarization curves, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). The results show that GDE is an excellent inhibitor. The inhibition efficiency was 94 % at 2 g/L GDE. The GDE follows the Langmuir adsorption isotherm and involves physical adsorption. The GDE acts as a mixed-type inhibitor.