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

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 a...

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Bibliographic Details
Published in:	Phosphorus, sulfur, and silicon and the related elements Vol. 190; no. 8; pp. 1366 - 1377
Main Authors:	de Oliveira, Clara G. M., Faria, Vitor W., de Andrade, Gabriel F., D'Elia, Eliane, Cabral, Murilo F., Cotrim, Bruno A., Resende, Gabriel O., de Souza, Flávia C.
Format:	Journal Article
Language:	English
Published:	Abingdon Taylor & Francis 03-08-2015 Taylor & Francis Ltd
Subjects:	EIS experiments Thiourea derivatives weight-loss measurements
Online Access:	Get full text
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Summary:	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, ΔG 0 ads values indicate the chemical adsorption of thiourea-based compounds. The E Corr values obtained for the thiourea derivative with the methyl functionality was cathodically shifted by approximately −0.08 V, with an inhibition efficiency of 81%.
ISSN:	1042-6507 1563-5325
DOI:	10.1080/10426507.2015.1035719