Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (03): 623-629.doi: 10.3866/PKU.WHXB201112293

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Corrosion Inhibition Performance of Carbon Steel in Brine Solution Containing H2S and CO2by Novel Gemini Surfactants

ZHAO Jing-Mao, LI Jun   

  1. College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
  • Received:2011-10-17 Revised:2011-12-26 Published:2012-02-23
  • Contact: ZHAO Jing-Mao
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51171013).

Abstract: A series of novel gemini surfactants containing hydroxyl group have been synthesized including 1,3-bis(dodecyl dimethyl ammonium chloride)-2-propanol, 1,3-bis(myristyl dimethyl ammonium chloride)-2-propanol, 1,3-bis(hexadecyl dimethyl ammonium chloride)-2-propanol, and 1,3-bis(octadecyl dimethyl ammonium chloride)-2-propanol, designated as n-3OH-n (n=12, 14, 16, 18, respectively). The corrosion inhibition for carbon steel in brine solution containing H2S and CO2 was investigated using weight loss method, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). The results showed that the inhibition efficiencies (IEs) obtained from all of the methods employed demonstrated a clear trend, with the IEs of the gemini surfactants ranked as 14-3OH-14>12-3OH-12> 16-3OH-16>18-3OH-18. Among them, 14-3OH-14 and 12-3OH-12 acted as excellent corrosion inhibitors with IE values greater than 95% at an additive concentration of 35 mg·L-1. Potentiodynamic polarization curves clearly revealed that the gemini surfactants are mixed-type inhibitors which preferentially inhibit the anodic corrosion process. Adsorption of the synthesized gemini surfactants n-3OH-n (n=12, 14, 16) onto a carbon steel surface obeys the Langmuir adsorption isotherm and they exhibit a mixed physical and chemical adsorption. An adsorption model was proposed to elucidate the inhibition mechanism of gemini surfactants.

Key words: Corrosion inhibitor, Gemini surfactant, Corrosion, Hydrogen sulfide, Carbon dioxide


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