Corrosion Inhibition Efficiency of Chromolaena odorata Leaves Extract on Mild Steel in Sulphuric Acid Medium

Abstract

The weight loss technique was utilized to explore how siam leaf extract affects the corrosion of mild steel in a 1.5 M H2SO4 solution. The investigation took place under varying conditions: without the extract and with different concentrations (2.0 – 10.0 g/L) at temperatures ranging from 298 to 328 K, with an exposure time of 6 hours. The findings indicated that higher amounts of the extract led to better inhibition of corrosion, but increased temperatures had an adverse effect. The collected data underwent analysis employing Langmuir, Temkin, and Freundlich isotherm models, with Langmuir exhibiting the most substantial correlation among them. Moreover, the thermodynamic analysis revealed that the adsorption of the extract onto the mild steel surface was endothermic, spontaneous, and aligned with a physical adsorption mechanism. Consequently, siam leaf extract proves to be a promising green corrosion inhibitor in preventing corrosion.