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GEMINI SURFACTANTS CONTAINING HYDROXYL GROUP AS CORROSION INHIBITORS FOR Q235 STEEL IN BRINE SOLUTION SATURATED BY CO2 |
ZHAO Jingmao, LI Jun |
School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029 |
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Abstract Four gemini surfactants n-3OH-n (n=12, 14, 16, 18) were synthesized and their corrosion inhibition performance for Q235 steel in brine solution saturated by CO2 was investigated by mass loss method, polarization curves and electrochemical impedance spectroscopy (EIS). The results indicated that gemini surfactants act as good corrosion inhibitor. Among four surfactants, 12-3OH-12 and 14-3OH-14 are better than the others. Potentiodynamic polarization curves clearly reveal that the gemini surfactants belong to mixed type inhibitors which preferentially restrain the anodic process of corrosion. The values of inhibition efficiency obtained from mass loss measurements, potentiodynamic polarization measurements and EIS measurements are in good agreement.
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Received: 20 June 2011
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Corresponding Authors:
ZHAO Jingmao
E-mail: jingmaozhao@126.com
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