Olive leaf as green corrosion inhibitor for C-steel in Sulfamic acid solution

ABSTRACT The effect of Olive leaf as a corrosion inhibitor for C-steel in 10% Sulfamic acid (NH2SO3H) solution was tested utilizing different techniques. The effect of temperature (298–328？K) was determined and activation and adsorption thermodynamic parameters were counted and discussed. The surface morphology was analyzed utilizing a scanning electron microscope (SEM). Potentiodynamic polarization procedures evidenced that Olive leaf acts as mixed-type inhibitor for corrosion of C-steel in 10% NH2SO3H solution. The addition of Olive leaf produces an increase in the charge transfer resistance (Rct) and reduction in capacitance of the double layer (Cdl). The inhibition mechanism involves physisorption. The adsorption of this extract on C-steel surface follows Langmuir isotherm. All the studied techniques gave similar results. GRAPHICAL ABSTRAC