Naslov
In situ studies of imidazole and its derivates as copper corrosion inhibitors I. Activation Energies and Thermodynamics of Adsorption

Autori
Gašparac, Rahela ; Martin, C.R. ; Stupnišek-Lisac, Ema

Izvornik
Journal of the electrochemical society (0013-4651) 147 (2000), 2; 548-551

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
copper; hydrochloric acid; imidazoles; corrosion; inhibition

Sažetak
The objective of this work was to investigate the efficiency of imidazole and its derivates 4-methylimidazole, 4-methyl-5-hydroxy-methylimidazole, 1-phenyl-4-methylimidazole, and 1-(p-tolyl)-4-methylimidazole for corrosion inhibition of copper in 0.5 M hydrochloric acid. Corrosion inhibition was studied using potentiodynamic methods. These studies have shown that 1-(p-tolyl)-4-methylimidazole has the best inhibitory efficiency. Activation energies were obtained by measuring the temperature dependence of the corrosion current. The activation energies in the presence of the various inhibitors are low (3-5 kJ/mol), with the best inhibitor showing the highest value. The adsorptive behavior of the imidazole derivates on copper electrode surface follows a Freundlich-type isotherm. The standard free energies of adsorption are also low (14-16 kJ/mol), indicating that imidazole and its derivates physisorb on copper surface. Possible mechanisms of corrosion inhibition for these molecules are discussed.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA