Abstract
The corrosion behavior of zinc in 0.2 M hydrochloric acid solution by Azadirachta indica (AI-Neem) was investigated using mass loss, electrochemical polarization and impedance methods. Inhibition efficiency depends on the concentration of AI-Neem and it reaches maximum value at 1,000 ppm. The shape of polarization profile indicated that AI-Neem is a mixed type inhibitor with predominant cathodic effect. Adsorption of AI-Neem on the zinc surface follows Temkin adsorption isotherm. The surface morphology of zinc was studied by using scanning electron microscope images.
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