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Citation: SOLMAZ R., MERT M. E., KARDAS G., YAZICI B., ERBIL M.. Adsorption and Corrosion Inhibition Effect of 1,1’-Thiocarbonyldiimidazole on Mild Steel in H2SO4 Solution and Synergistic Effect of Iodide Ion[J]. Acta Physico-Chimica Sinica, ;2008, 24(07): 1185-1191. doi: 10.1016/S1872-1508(08)60053-4 shu

Adsorption and Corrosion Inhibition Effect of 1,1’-Thiocarbonyldiimidazole on Mild Steel in H2SO4 Solution and Synergistic Effect of Iodide Ion

1.
Department of Chemistry, Science &Letters Faculty, Cukurova University, Balcali Adana 01330, Turkey

Received Date: 13 February 2008
Available Online: 7 May 2008

The inhibition effect of 1,1’-thiocarbonyldiimidazole (TCDI) on the corrosion behaviors of mild steel (MS) in 0.5 mol·L -1 H2SO4 solution was studied with the help of potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and linear polarization resistance (LPR) techniques. The effect of immersion time on the inhibition effect of TCDI was also investigated over 72 h. For the long-term tests, hydrogen evolution with immersion time (VH2-t) was measured in addition to the three techniques already mentioned. The thermodynamic parameters, such as adsorption equilibrium constant (Kads) and adsorption free energy (⊿Gads) values, were calculated and discussed. To clarify inhibition mechanism, the synergistic effect of iodide ion was also investigated. The potential of zero charge (PZC) of the MS was studied by electrochemical impedance spectroscopy method, and a mechanism of adsorption process was proposed. It was demonstrated that inhibition efficiency increased with the increase in TCDI concentration and synergistically increased in the presence of KI. The inhibition efficiency was discussed in terms of adsorption of inhibitor molecules on the metal surface and protective filmformation.
- Corrosion inhibitor,
- 1,1’-Thiocarbonyldiimidazole,
- Adsorption,
- Inhibition mechanism,
- Synergistic effect,
- Potential of zero charge
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沈阳化工大学材料科学与工程学院沈阳 110142

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