Corrosion inhibition by N-(alkyloxycarbonylmethyl)-N-triethanol ammonium chloride with respect to the surface and thermodynamic properties

N-[(octyloxycarbonylmethyl)-N-triethanol ammonium chloride] (C-8), N-[(dode cyloxycarbonylmethyl)-N-triethanol ammonium chloride] (C-12) and N-[(hexade cyloxycarbonylmethyl)-N-triethanol ammonium chloride] (C-16) were synthesiz ed. Surface tension was measured in aqueous solution for different concentr ations at 28, 38 and 48 degrees C. Various surface properties of the synthe sized surfactants were evaluated, particularly critical micelle concentrati on (CMC), efficiency (Pi(CMC)) as well as maximum surface excess (Gamma(max )) and minimum surface area (A(min)). Micellization and adsorption in both liquid/air and liquid/solid interfaces thermodynamics were investigated. Th ese products have pronounced surface activity and satisfactory corrosion in hibition of C-steel in hydrochloric acid at 28, 38 and 48 degrees C. (C) 19 99 Society of Chemical Industry.