期刊
ACTA PHYSICO-CHIMICA SINICA
卷 26, 期 8, 页码 2163-2170出版社
PEKING UNIV PRESS
DOI: 10.3866/PKU.WHXB20100809
关键词
Corrosion inhibitor; Weight loss method; Electrochemical method; Quantum chemistry
资金
- CNPC Innovation Foundation [2008D-5006-02]
- Corrosion Inhibitor Research Program for Puguang Gas Field of Sinopec [309003]
- National Innovation Experiment Program for University Students, China [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.
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