Author/Authors :
bourazmi, h. mohammed v university - faculty of sciences - laboratory of nanotechnology, materials environment, Rabat, Morocco , tabyaoui, m. mohammed v university - faculty of sciences - laboratory of nanotechnology, materials environment, Rabat, Morocco , el hattabi, l. mohammed v university - faculty of sciences - laboratory of nanotechnology, materials environment, Rabat, Morocco , el aoufir, y. university ibn tofail - faculty of sciences - laboratory of separation processes, Kenitra, Morocco , el aoufir, y. mohammed v university - faculty of sciences - laboratory of nanotechnology, materials environment, Rabat, Morocco , taleb, m. université sidi mohamed ben abdellah (usmba) - faculty of sciences - laboratory of electrochemistry, modification and environment engineering, Fes, Morocco
Abstract :
The corrosion inhibition properties of methanolic extract of Salvia Officinalis (MESO) on carbon steel in hydrochloric acid (1 M HCl) solution has been examined and characterized by weight loss, Tafel polarization and electrochemical impedance spectroscopy (EIS) methods. These methods were complemented with SEM and EDX examinations of the electrode surface. The experimental results reveal that the inhibitor has a good inhibiting effect on the carbon steel in 1 M HCl solution. The protection efficiency increases with increasing inhibitor concentration, but the temperature decrease the effect on the inhibition efficiency of MESO. The adsorption of MESO is found to obey the Langmuir adsorption isotherm. Thermodynamic data show that the adsorption mechanism of MESO on carbon steel surface in 1 M HCl solution is probably electrostatic-adsorption. Potentiodynamic polarization studies have shown that MESO acts as a mixed type of inhibitor.
Keywords :
Corrosion , Carbon steel , Inhibitor , Salvia Officinalis , Impedance , Polarization curves
