Citation: HU Song-Qing, HU Jian-Chun, FAN Cheng-Cheng, MI Si-Qi, ZHANG Jun, GUO Wen-Yue. Corrosion Inhibition of Q235 Steel by a Novel Imidazoline Compound under H₂S and CO₂ Coexistence[J]. Acta Physico-Chimica Sinica, ;2010, 26(08): 2163-2170. doi: 10.3866/PKU.WHXB20100809 shu

Corrosion Inhibition of Q235 Steel by a Novel Imidazoline Compound under H₂S and CO₂ Coexistence

1.
College of Physics Science and Technology, China University of Petroleum, Dongying 257061, Shandong Province, P. R. China

Received Date: 6 January 2010
Available Online: 11 June 2010
Fund Project: 中石油中青年创新基金(2008D-5006-02) (2008D-5006-02)中石化普光气田缓蚀剂技术研究项目(309003) (309003)国家大学生创新实验计划项目(091042546)资助 (091042546)

We synthesized a new imidazoline compound, 1-(2-amido-thioureaethyl)- 2-pentadecyl-imidazoline (IM-S). The corrosion inhibition performance and adsorption behavior for mild steel corrosion under H₂S and CO₂ coexistence were investigated by weight loss method, polarization curve, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). The results indicated that IM-S had excellent corrosion inhibition performance, and both cathodic and anodic processes of mild steel corrosion were suppressed. The highest inhibition efficiency was 92.74%. We found that the adsorption of IM-S on mild steel could be fitted to a Langmuir isotherm equation, and it belonged to a mix-type adsorption, which was mainly dominated by chemisorption. The relationship between the molecular structure of IM-S and the inhibition efficiency was investigated using quantum chemical calculations.
- Corrosion inhibitor,
- Weight loss method,
- Electrochemical method,
- Quantum chemistry
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Corrosion Inhibition of Q235 Steel by a Novel Imidazoline Compound under H2S and CO2 Coexistence

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Corrosion Inhibition of Q235 Steel by a Novel Imidazoline Compound under H₂S and CO₂ Coexistence