Experimental and theoretical investigations anti-corrosive properties of Menthone on mild steel corrosion in hydrochloric acid

The inhibition of menthone (man) on the corrosion of mild steel in 1 m hcl was studied by gravimetric as well as potentiodynamic polarization and electrochemical impedance spectroscopy (eis) techniques at 298-333 k. results obtained show that man act as inhibitor for mild steel in hcl solution. the inhibition efficiency was found to increase with increase in man concentration but decreased with temperature. polarization measurements showed that the studied inhibitor is mixed type. eis measurements revealed that the charge transfer resistance increases with increase in the concentration of inhibitor. the adsorption of the inhibitor on the mild steel in the acid solution was found to accord with langmuir's adsorption isotherm at all the concentrations and temperatures studied. phenomenon of physical adsorption is proposed from the activation parameter obtained. thermodynamic parameters reveal that the adsorption process is spontaneous. quantum chemical calculations using dft were used to calculate some electronic properties of the molecule in order to ascertain any correlation between the inhibitive effect and molecular structure of menthone.