Electrochemical Behavior of Jasmine Tea Extract as Corrosion Inhibitor for Carbon Steel in Hydrochloric Acid Solution

The extract of jasmine tea was studied as corrosion inhibitor for carbon steel in 1 mol L-1 HCl solution by electrochemical method, scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). Inhibition efficiency for carbon steel in HCl solution increases with inhibitor concentration and temperature. Adsorption behavior of the extract obeys Langmuir adsorption isotherm. Polarization curves results indicate that this extract is a mixed type inhibitor. SEM and XPS reveal that the extract adsorbs on metal surface and forms a protective layer.