Corrosion Protection of Zinc Sheet in Acidic Media Using D,L-Lactic Acid as Green Corrosion Inhibitor
Abstract
This work focused on the inhibition efficiency and behavior of D,L-lactic acid (DLLA) in the corrosion of zinc-sheet in 1.0 M hydrochloric solution at 30, 40 and 50 ̊C. The corrosion reaction was followed by the hydrogen evolution technique. From kinetic results, the corrosion rate (rcorr) of zinc sheet increased with increasing temperatures but surface coverage (θ) decreased. The inhibition efficiency (%I) of DLLA dramatically decreased from 40.0 to 4.1 and 3.2% when temperature increased from 30 to 40 and 50 ̊C, respectively. The corrosion activation energies (Ea) for zinc sheet and zinc sheet with DLLA were 54.9 and 71.7 kJ/mol, respectively. Furthermore, DLLA was adsorbed on zinc sheet surface with heat of adsorption (Qads) of -117.8 kJ/mol. The obtained Qads value indicated that the adsorption of DLLA on zinc-sheet surface was exothermic.
Keywords: adsorption corrosion inhibition D,L-Lactic acid kinetics zinc
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