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Original Articles

Synthesis of Thiourea Derivatives and its Evaluation as Corrosion Inhibitor For Carbon Steel

, , , , , , & show all
Pages 1366-1377 | Received 31 Jan 2015, Accepted 24 Mar 2015, Published online: 03 Aug 2015
 

GRAPHICAL ABSTRACT

Abstract

The inhibitory effect of thiourea-based compounds was evaluated using carbon steel body specimens in hydrochloric acid media. Thiourea derivatives, N-(pyrimidin-2-ylcarbamothioyl)benzamide and N-(6-methylpyridin-2-ylcarbamothioyl)benzamide, were synthesized using a simple route with good yields of approximately 70%. The inhibitory efficiencies were obtained by means of weight-loss experiments and electrochemical techniques (e.g., polarization curves and electrochemical impedance spectroscopy). The presence of a methyl functional group showed a better inhibitory efficiency compared with the derivate inhibitor without such modification. Analyzing Langmuir isotherms, ΔG0ads values indicate the chemical adsorption of thiourea-based compounds. The ECorr values obtained for the thiourea derivative with the methyl functionality was cathodically shifted by approximately −0.08 V, with an inhibition efficiency of 81%.

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