Zhao Jing-mao, L. Jun
Feb 23, 2012
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0
Influential Citations
15
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Journal
Acta Physico-chimica Sinica
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 H 2 S and CO 2 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.