Tilia leafs as eco-friendly corrosion inhibitor for mild steel in aqueous solutions

Abstract

Tilia Leafs extract activity as a green corrosion inhibitor (environmental friendly) for mild steel in 1M HCl has been tested using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS). The obtained results show that Tilia Leafs extract is an excellent corrosion inhibitor. The inhibition efficiency increases with increasing the temperature from 25 to 45°C, reaching a maximum value of 79% at the highest concentration of 300 ppm at the temperature of 45°C. Polarization measurements demonstrate that the Tilia Leafs extract acts as a mixed type inhibitor. Nyquist plot illustrates that on increasing Tilia Leafs extract concentration, the charge transfer increases and the double layer capacitance decreases. The adsorption of Tilia Leafs extract on mild steel obeys Temkin adsorption isotherm.