Synthesis and characterization of bolaform surfactants from sugar derivative and their associates with 2-aminobenzimidazole as inhibitor of zinc in 3% NaCl medium

Abstract

The purpose of this manuscript is to synthesize and characterize new corrosion inhibitor compounds such as ion paired surfactants (1,7-lactobionamidoheptanoic acid) derived from non-toxic soluble sugars and to examine the inhibitory effect of these products on the corrosion of zinc in the 3% NaCl medium. The prepared products are chemically pure, and the average yield is of the order of 80%. The characterization of these molecules was performed by NMR (1H and13C), IR, mass spectroscopy and elementary analysis. The anticorrosive effect of the surfactant, (1,7-lactobionamidoheptanoic acid) on the corrosion of zinc in 3% NaCl solution was evaluated by gravimetric and electrochemical techniques (potentiodynamic polarization and electrochemical impedance spectroscopy). The results showed that our synthesized surfactant (the bolaform: 1,7-lactobionamidoheptanoic acid) is an excellent corrosion inhibitor for zinc in 3% NaCl. Up to 90% inhibitory efficacy has been demonstrated by surfactant at a concentration of 5·10–3 M. Based on polarization curves, it is clear that the surfactant 1,7-lactobionamidoheptanoic acid can be considered as a mixed inhibitor with a predominantly cathodic character. Inhibitory efficacy increases with increasing inhibitor concentration. No corrosion product formed.