A brief review is given of the application of impedance measurements to electrochemical processes. Only very few applications for corrosion processes have been reported. The inhibitive action of the of poly (4-vinylpyridine isopentyl bromide) (P4VPIPBr) in three degrees of quaternisation (6%, 18% and 79 %) on the corrosion behaviour of pure iron was investigated in desaerated molar sulphuric acid solution, by means of electrochemical impedance spectroscopy measurements (EIS) at free corrosion potential. The parameters, which characterise the corrosion behaviour, can be determined from plots and diagrams of Nyquist. Their inhibition efficiency (E%) increases with the concentration of all inhibitors. Trends in the increase of charge transfer resistance and decrease of capacitance values also show the adsorption of the molecules on the metal surface.
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