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| Synergistic Inhibition Mechanism of Imidazoline and Thiourea in CO2 Corrosive System |
| ZHAO Jingmao, CHEN Guohao |
| College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China |
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Abstract The synergistic inhibition effect between oleic-based imidazoline quaternary ammonium salt (OIMQ) and thiourea (TU) for Q235 carbon steel in CO2-saturated brine solution was investigated by using polarization curves and electrochemical impedance spectroscopy (EIS). The results showed that TU had strong inhibition on the anodic and cathodic processes of carbon steel corrosion, while OIMQ acted as mixed-type inhibitor preferentially restraining the anodic process of metal. The combination of OIMQ and TU could effectively decrease the additive concentration and showed excellent synergistic inhibition effect. A bi-layer inhibitor film with the inner layer of TU molecules and the outer layer of imidazoline molecules was formed, which could retard the desorption of TU molecules and the attack of aggressive ions.
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