MYRICETIN AS CORROSION INHIBITOR FOR METALS IN ALCOHOLIC SOLUTIONS

Corrosion inhibitory effect of myricetin in alcoholic solutions has been studied by potentiodynamic polarization. Inhibitory efficiencies of 70%, 61%, 69% and 79% have been obtained for stainless steel, carbon steel, aluminum alloy, and aluminum, respectively. Adsorption Gibbs free energy, determined using Langmuir adsorption isotherms, has revealed that interactions between metal atoms and myricetin adsorbed molecules have chemical character. Moreover, quantum chemistry calculations have shown that myricetin, due to its molecular structure (O heteroatoms with lone pair electrons and p electrons from aromatic rings) has the ability to form an adsorption layer on the metal surface that inhibits the diffusion of molecules and ions participating in the global corrosion process.