The inhibition properties of Kimbiolongo Extract (KE), on the corrosion rate of mild steel (MS) in 1.0 HCl solutions was investigated using gravimetric and electrochemical techniques (potentiodynamic polarization measurements and electrochemical impedance spectroscopy, EIS). The results indicated that these green inhibitors effectively reduced the corrosion rate. Results showed that inhibition efficiency increases with concentration and maximum value was obtained at 100 ppm concentration. Polarization studies showed that this inhibitor decreased the corrosion current densities by a mixed-mode mechanism. The adsorption of this inhibitor on steel surface obeys Langmuir adsorption isotherm. Inhibition efficiency E (%) obtained from the various methods is in good agreement.
