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Evidence for Homogeneous Adsorption of Samanea saman Extract Inhibitor on Steel Surface

Kavitha Rose, Monikandon Sukumaran, Kesavan Devarayan, and Sankar Arumugam

In this study, homogeneous adsorption of Samanea saman inhibitor on the surface of steel is described. For the first time, the interaction between the aforementioned inhibitor molecules and the steel surface is evidenced using energy dispersive X-ray spectroscopy. The weight loss measurements and electrochemical studies revealed that 500 ppm of ethanolic extract of Samanea saman inhibits the corrosion of steel in 1.0 M HCl with approximately 90% inhibition efficiency. Further the adosorption of green inhibitor is found to fit Langmuir’s adsorption isotherm model.