This study describes the ability of Calicotome extract (CE) to inhibit the corrosion of C-steel in polluted NaCl (3.5%NaCl+ 16 ppm Na2S) solution which carried out using chemical (weight loss, WL)and electrochemical(potentiodynamic polarization, PP, electrochemical impedance spectroscopy, EIS and electrochemical frequency modulation, EFM)techniques. Temkin isotherm was tested to describe the adsorption behavior of C-steel surface. The PP measurements revealed that the adsorption of extract affects both anodic and cathodic reactions. The protection efficiency (%IE) increases by rising concentrations, while it lowers with raisingthe temperature.The C-steel surface morphology in the presence and absence of CE has been tested via Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and (FTIR) spectroscopy measurements. Theobtained data fromdifferent techniquesare in good agreement.