Study of thioureas derivatives synthesized from a green route as corrosion inhibitors for mild steel in HCl solution
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- 作者：V.V. Torres ; V.A. Rayol ; M. Magalh茫es ; G.M. Viana ; L.C.S. Aguiar ; S.P. Machado ; H. Orofino ; E. D鈥橢lia
- 关键词：A. Carbon steel ; B. EIS ; B. Polarization ; B. SEM ; C. Acid corrosion
- 刊名：Corrosion Science
- 出版年：February, 2014
- 年：2014
- 卷：79
- 期：Complete
- 页码：108-118
- 全文大小：1754 K
文摘
The behaviour of 1,3-dibenzylthiourea (DBTU) and 1-benzyl-3-diisopropylthiourea (DPTU) have been investigated as carbon steel corrosion inhibitors in HCl solution by weight loss measurements, potentiodynamic polarization curves, electrochemical impedance and scanning electron microscopy analysis. Quantum chemical calculation was applied to correlate electronic structure parameters of thiourea derivatives with their inhibition performances. DPTU results were slightly superior to those obtained in the presence of DBTU, showing that the replacement of one benzyl group for two isopropyl groups enhances the inhibitory properties. The 1,3-dibenzylurea derivative has also been studied in order to assess the importance of the sulphur atom to the inhibitory effect.