Abstract:
Corrosion inhibitors are generally used in reducing metallic corrosive effects. Nevertheless,
most inhibitory compounds have harmful effects on the environment, as well as being expensive
and toxic. Therefore, there is growing awareness of the need to replace petroleum inhibitors with
eco-friendly inhibitors. Eggshell agro-industrial waste (ESAW) is a compound with high inhibitive
activity and its utilization is desirable to minimize the quantity of agricultural waste generated.
Hence, this study aims to demonstrate the inhibition efficiency of eggshell extract, a waste compound,
on mild steel (material frequently utilized in the oil and gas sector) in one molar hydrochloric acid
solution accessed via weight loss and electrochemical methods. Potentiodynamic polarization results
shows that the current densities of mild steel corrosion significantly decreased using eggshell agroindustrial
waste. Similarly, electrochemical impedance spectroscopy results suggest that eggshell
agro-industrial waste enhances the mild steel polarization resistance significantly. The inhibitor
performance increases with increasing eggshell agro-industrial waste concentration, with optimum
efficiency of 97.17%. The inhibition was due to the adsorption and adhesion of the eggshell agroindustrial
waste constituents on the surface of the mild steel; the adsorption obeys the Langmuir
adsorption isotherm model. Compared with various reported corrosion inhibitors in the literature,
eggshell agro-industrial waste is very effective. Therefore, eggshell agro-industrial waste can be
recommended as a potential inhibitor in the oil and gas sector.
