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Electrochemical impedance of Ni(OH)2 layers generated on composite Ni-epoxy resin material in basic media are analysed. The formation of α- is favoured in comparison of the β-Ni(OH)2 due to the surface morphology of the composite. The calculated number of charge carrier across Ni(OH)2 from Mott-Schottky analysis of EIS simultaneously depends on the surface morphology of the composite substrate as well as on the method of deposit.

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A kinetic model has been put forward to account for experimental results, wherein the electrical elements measured by electrochemical impedance spectroscopy (EIS) are related to the kinetic constants of the aforementioned mechanism. In here, mass transport is virtually absent (or considered as very big and hence negligible). High concentrations of phenformin hydrochloride favour its adsorption onto the nickel surface and its subsequent reaction with corrosion products, thus making it able to inhibit the electro-dissolution of nickel.