Inhibition Effect of Extractives from Bohea Leaves on Carbon Steel in Hydrochloric Acid Solution

The corrosion inhibition effect of the Bohea leaves exctrative on carbon steel in 1.0 mol/L HCl solution was investigated by using potentiodynamic polarization and electrochemical impedance spectroscopy. The results indicate that the Bohea leaves extractive exhibits good corrosion inhibition effect on carbon steel. The inhibition efficiency increased with increasing concentration of Bohea leaves extractive. The Bohea leaves extractive is a mixed-type inhibitor. The adsorption of the effective corrosion inhibition component of Bohea leaves extractive on the carbon steel surface conforms with Langmuir adsorption isotherm equation, which belongs to monolayer adsorption.