Evaluation Of Corrosion Inhibition Of Mild Steel In 1m Hydrochloric Acid Solution By Mollugo Cerviana

The inhibiting effect of methanolic extract of Mollugo cerviana plant on the corrosion of mild steel in 1M HCl solution has been investigated by different techniques like potentiodynamic polarization, electrochemical impedance spectroscopy, and weight loss methods for five different concentrations of plant extract ranging from 25 to 1000mg/L. The results indicated that the corrosion inhibition efficiency increased on increasing plant extract concentration till 500mg/L and decreased on further increasing concentration. The extract was a mixed type inhibitor with the optimum inhibition concentration of 500mg/L in potentiodynamic polarization. The adsorption of the plant extract on themild steel surface was found to obey Langmuir adsorption isotherm. Surface analysis was also carried out to find out the surface morphology of the mild steel in the presence and in the absence of the inhibitor to find out its efficiency. The obtained results showed that the Mollugo cerviana extract acts as a good inhibitor for the corrosion of mild steel in 1M HCl solution.