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

• A. El Yadini^1,2, H. Saufi¹, E. Perez², M. Blanzat², S. Franceschi-Messant² and S. El Hajjaji¹

¹ Laboratory of Spectroscopy, Molecular Modeling, Materials, Nanomaterials, Water and Environment, CERNE2D, Faculty of science, Mohammed V University in Rabat, Morocco
² Laboratoire des Interactions Moléculaires et Réactivité Chimique et Photochimique UMR 5623, 118 route de Narbonne – 31062, Toulouse, Cedex – France

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 and ¹³C), 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.

Keywords: organic compounds, ion paired surfactants, 1, 7-lactobionamidoheptanoic acid, bolaform, corrosion inhibition

Int. J. Corros. Scale Inhib., 2023, 12, no. 1, 32-47
doi: 10.17675/2305-6894-2023-12-1-2

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