A new corrosion inhibition for protection of steel

BOUAMRA, Bouzid (2024) A new corrosion inhibition for protection of steel. Doctoral thesis, Université Mohamed Khider (Biskra - Algérie).

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Abstract

Ghars date fruit is very rich in polysaccharides, which qualifies it to be exploited as a green corrosion inhibitor. Ghars date is produced in large commercial quantities in Africa and Asia, which gives them the opportunity to be used as a cheap raw material for the industry of eco-friendly inhibitors. The synergy between the Ghars date extract (GDE) and iodide ions is investigated for the first time to improve the inhibition efficiency for API 5L X70 pipeline steel in 0.5 mol L-1 sulfuric acid. The synergistic effect of the GDE and iodide ions is studied by potentiodynamic polarization curves and electrochemical impedance spectroscopy, scanning electron microscopy (SEM) and energy‐dispersive X‐ ray spectroscopy (EDX). The inhibition efficiency is 45.5 % at 2 g L-1 GDE at 20 °C, while it increases to 97.9 % when 5×10-4 mol L-1 of potassium iodide is added at 25 °C. It is found that significant corrosion inhibition can be obtained in a synergistic manner. The GDE/iodide ion system follows the Langmuir adsorption isotherm, involves both physical adsorption and chemical adsorption and acts as a mixed-type inhibitor.

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