The Use of Eco-Friendly Leaf as a Corrosion Inhibitor of Mild Steel in an Acidic Environment

摘要

The leaf extract of Achyranthes aspera L was investigated for corrosion inhibition of mild steel in 1.0M HCl medium at room temperature. Gravimetric technique was used to study the corrosion behavior in the absence and presence of different concentrations of the leaf extract. The result obtained showed that the Achyranthes aspera L is a good inhibitor for mild steel in 1.0M HCl solution. The corrosion rate and inhibition efficiency were calculated. The inhibition efficiency calculated showed a great percentage result with optimum value of 82.3%. Achyranthes aspera L extract was adsorbed on the mild steel surface in accordance with Langmuir, Frumkim, and Flory-Huggins adsorption isotherm models. The negative adsorption energy ΔG_ads obtained inferred that the adsorption rates were spontaneous and the interaction between the inhibitive molecules was found to be repulsive.