Synthesis of 1,3-Bis-[(Dodecanoyl Oxypropyl Dimethylammonium) Propane] Dibromide Ester-Quat Surfactant;Micellar,Thermodynamic and Corrosion-Inhibiting Properties

摘要

Ester-quat surfactant;l,3-bis-[(dodecanoyI oxypropyl dimethyl-ammonium) propane] dibromide referred as 12-3-3-3-12 was synthesized,purified and characterized by Elemental Analysis,1H-NMR,13C-NMR,IR and Mass Spectra. The thermodynamic properties of aqueous solutions of this ester-quat were investigated using Electrical Conductivity and SurfaceTension measurements. The corresponding parameters of micellisation were determined for each technique. Otherwise the inhibitive action of the ester-quat (12-3-3-3-12) on the corrosion behaviour of iron was investigated in HCl and H2SO4 medium by means Electrochemical Resistance and Polarisation methods. The ester-quat 12-3-3-3-12 acts as a cathodic-type inhibitor. The maximum inhibition efficiency was reached around the critical micellar concentration. The ester-quat appears to be adsorbed in the metal/ liquid interface through the general mode following the Frumkin adsorption model.