The Inhibition Action of Viscum Album Extract on the Corrosion of Carbon Steel in Hydrochloric Acid Solution

Corrosion rate of carbon steel (CS) in 1M HCl was examined in the absence and presence of Viscum album plant extract as a corrosion inhibitor using weight loss, polarization, and impedance techniques. The effect of temperature and extract dose was studied using a weight loss test. The outcome data gained displayed that Viscum album extract plays as an inhibitor for CS in HCl and reduces the corrosion rate. The higher inhibition efficacy reached 96.3% for Viscum album at greater inhibitor doses (300 ppm) and temperature. Polarization data revealed that this extract acts as a mixed kind inhibitor. The surface analysis of CS was checked by different methods, which showed the formation of extract film on the CS surface. The adsorption of Viscum album plant extract was found to obey the Temkin model, and the data of adsorption free energy was more negative than -40 kJ/mol, which means that the adsorption is chemical.