Abstract
INHIBITION EFFICIENCY OF THIOUREA AND ISOMETHYLTHIOUREA ON ALUMINUM CORROSION IN TRICHLOROACETIC ACID

P S Desai*

ABSTRACT

Thiourea and Isomethylthiourea were studied as a corrosion inhibitor for aluminum in trichloroacetic acid (TCA) solution. The inhibition efficiency depended on the concentration of acid and the inhibitor. Inhibition efficiency of TCA solutions increased with the concentration of Thiourea And Isomethylthiourea, but decreased with rise in temperature, this corresponded to surface coverage of the metal by the inhibitor. The degrees of surface coverage, θ, were calculated and found to increase with the inhibitor concentration. The results show also that, the inhibitors were adsorbed on the aluminum surface according to Langmuir adsorption isotherm. Polarization study reveals that the inhibitors function as a little anodic, but significant cathodic inhibitor.

Keywords: Corrosion, Aluminum, Trichloroacetic acid, Thiourea and Isomethylthiourea, Adsorption.


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