Phenyl semicarbazide derivatives as corrosion inhibitors for aluminium in hydrochloric acid solution

Abstract

Measurements of the corrosion rate of aluminium in 2N HCl at 27°C with and without addition of phenyl semicarbazide derivatives (10−3−10−5 mol/l) were performed. The adsorption of these compounds was elucidated. Results show that phenyl semicarbazide derivatives are adsorbed on the aluminium surface according to the Frumkin isotherm. From the adsorption isotherm some thermodynamic data for the adsorption process (ΔG°ads. andf) are calculated and discussed.