Green Corrosion Inhibitory Efficiency of Isolated Flavonoid from Spermacoce hispida Leaves on Mild Steel in Acid Medium

Abstract

Investigations on the effectiveness and inhibitory activity of the isolated flavonoid (Rutin) from Spermacoce hispida plants against corrosion of metal in a 1M HCl acidic solution include mass loss analysis, potentiostatic curves, and electrochemical methods. Plant extracts have been found to exhibit excellent inhibitory properties against corrosion of metals in different environments. The base metal's ability to stop corrosion improves when the green inhibitor is absorbed, and the rate of steel corrosion decreases. According to weight loss measurements, the highest corrosion inhibition efficacy is 87.99%. The electrochemical impedance study revealed that when the rutin concentration in S. hispida leaves increased, the IE value rose along with the Rct and Cdl values. As a consequence of adsorption, this pure flavonoid extract binds to the metal surface, with the adsorption kinetics being characterized by the Langmuir isotherm. According to the findings of this study, the extracted flavonoid from S. hispida leaf extract seems to be a powerful and environmentally benign basic metal inhibitor in an acid medium.