Adsorption and inhibitive effect of Schinus terebinthifolius extract as a green corrosion inhibitor for carbon steel in acidic solution

作者：Shalabi K^*; Nazeer Ahmed Abdel

来源：Protection of Metals and Physical Chemistry of Surfaces, 2015, 51(5): 908-917.

DOI：10.1134/S2070205115050226

The effect of Egyptian Schinus-terebinthifolius extract (STE) on carbon steel corrosion in 0.5 M HCl solution was investigated by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) techniques. The results show that STE is a good inhibitor in 0.5 M HCl. The adsorption of STE obeys Langmuir adsorption isotherm. STE acts as mixed-type but mainly cathodic inhibitor in 0.5 M HCl. The thermodynamic parameters of the corrosion process were calculated and discussed. Maximum inhibition approached 93.3% at 900 ppm STE. SEM showed the Protective film formation on steel surface in presence of STE.

• 出版日期2015-9