engleski

Inhibition of Copper Corrosion in NaCl Solution by Caffeic Acid

The inhibition of copper corrosion by caffeic acid in 10 % ethanolic 0.5 mol dm-3 NaCl solution has been studied by means of open circuit potential measurements, linear and potentiodynamic polarization measurements and electrochemical impedance spectroscopy measurements. Results of investigations showed that caffeic acid inhibited copper corrosion in the studied environment via adsorption on the Cu/corrodent interface. The compound essentially functioned as a cathodic inhibitor for copper corrosion and the inhibition efficiency increased with concentration. The adsorption behavior of caffeic acid on the Cu electrode surface followed the Freundlich adsorption isotherm with the free energy of adsorption ∆G = –10.922 kJ mol-1, which indicates physical adsorption. The adsorption behavior was assessed at the molecular level by means of quantum chemical computations and molecular dynamics simulations, within the framework of the density functional theory (DFT). The simulations showed good agreement with the experimental results.

caffeic acid ; copper ; corrosion ; electrochemical techniques ; Freundlich adsorption isotherm

Glavni autori rada su: Ladislav Vrsalović i Senka Gudić