Abstract

Adsorptive and inhibitive properties of plant part extracts of Ceratonia siliqua was investigated in this study. The various extracts of the plant were assessed as acid-corrosion inhibitors. The corrosion inhibitive potentials of hexane, chloroform, and ethanol extracts of the bean (with gum and pod), leaves, and bark (with stem) of C. siliqua on zinc in 2M HCl was studied by measuring weight loss, inhibition efficiency, surface coverage, and corrosion rate. The weight loss studies showed the hexane extract of the bean (with gum and pod) to exhibit higher anti-corrosion property than the hexane fraction of the leaves and bark (with stem). Furthermore, the chloroform and ethanol extracts of the leaves were more efficient in retarding weight loss than the bean and bark. The ethanol extract of the leaves showed the highest inhibition efficiency of 96.67% and 0.9667 for surface coverage at 5 min for 50% v/v when compared with the other extracts of the plant. The chloroform extract of bark (with stem) and ethanol extract of leaves of Ceratonia silique has the best anticorrosion potentials in this study. C. Siliqua extracts can effectively serve as green inhibitors of zinc corrosion in acid medium.