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Study of thioureas derivatives synthesized from a green route as corrosion inhibitors for mild steel in HCl solution

2013; Elsevier BV; Volume: 79; Linguagem: Inglês

10.1016/j.corsci.2013.10.032

1879-0496

Victor Valencia Torres, V.A. Rayol, Mariana Magalhães, Gil Mendes Viana, Lúcia C. S. Aguiar, Sérgio de Paula Machado, H. Orofino, Eliane D’Elia,

Hydrogen embrittlement and corrosion behaviors in metals

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.