Corrosion Inhibition of Galvanized Steel in Hydrochloric Acid Solution using ¬¬ 1,8-Diazabicyclo[5.4.0]undec-7-ene as New Organic Inhibitor

Wanich Limwanich, Puttinan Meepowpan, Nawee Kungwan, Winita Punyodom

Abstract


In this work, 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) was, for the first time, utilized as the organic corrosion inhibitor for galvanized steel in 1.0 M HCl, at 30 oC  and 40oC. The corrosion reactions of galvanized steel in 1.0 M HCl with DBU concentrations: 3.0, 6.0, 9.0 and 50.0 mM and without DBU had been investigated by gasometrical and weight loss measurements. The results from both techniques showed that DBU was found to be the highly effective corrosion inhibitor for galvanized steel in an acidic media. The highly inhibiting efficiency of DBU was up to 88% at 30oC. The result from kinetics study showed that the corrosion rate of steel was decreased with decreasing of temperature and increasing of DBU concentration. Moreover, the activation energy (Ea) was increased with increasing of DBU concentration. From thermodynamic analysis, the adsorption of DBU on steel surface was physical adsorption and spontaneous process, due to the free energy changes of adsorption are negative (∆G values are -14 to -27 kJ/mol). Overall results suggested that, in significant, the presence of DBU can effectively prevent the damage of steel sheet in HCl solution.

                               

Keywords :  galvanized steel, corrosion, 1,8-diazabicyclo[5.4.0]undec-7-ene,  adsorption, kinetics


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