The statistical and theoretical view on mild steel (MS) corrosion in a sulphuric acid medium in the presence of leaves extract of Mussaenda frondosa (MF) were studied by electrochemical impedance spectroscopy and potentiodynamic polarization techniques. The nature of the inhibitor was defined by the polarization studies. The semicircle curves observed in electrochemical impedance spectroscopy indicated that the corrosion of mild steel is controlled by the charge transfer process. The corrosion

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... nhibition performances enhanced by the addition of MF extract and increase with increase in the concentration of the MF extract. GCMS is used to gather the important phytochemical constituents in the MF extract. The adsorption of MF on the metal surface is confirmed by SEM images. DFT was performed in order to confirm the adsorption of the constituents in MF extract on MS.