Phosphorus, Sulfur and Silicon and the Related Elements p. 1366 - 1377 (2015)
Update date:2022-08-11
Topics:
De Oliveira, Clara G. M.
Faria, Vitor W.
De Andrade, Gabriel F.
Delia, Eliane
Cabral, Murilo F.
Cotrim, Bruno A.
Resende, Gabriel O.
De Souza, Flávia C.
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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