Novel corrosion inhibitor TTB for carbon Steel C1018 in acidic environment.

Abstract

The invention relates to the synthesis and characterization of a novel corrosion inhibitor, 1,3,5,7-tetrahexyl-1,3,5,7-tetraazaadamantane-1,3,5,7-tetraium bromide (TTB), used to reduce corrosion in highly concentrated acidic solutions, particularly in oil injection wells. The compound TTB was synthesized through the reaction of hexamine with hexyl bromide in ethanol, and its structure was confirmed using FTIR, 1H-NMR, and 13C-NMR spectroscopy The inhibitory effect of TTB on the corrosion of Low C1018 alloy coupons was demonstrated using gravimetric and polarization techniques in 6M hydrochloric acid at varying temperatures and concentrations. The highest inhibition efficiency was observed to be 97.5% at a temperature of 50 degrees Celsius and a TTB concentration of 200 ppm. The adsorption of TTB on the metal surface follows the Langmuir adsorption isotherm, indicating strong adsorption and a spontaneous, exothermic, and chemically adsorbed process. Further investigations were obtained through quantum chemical calculations and Monte Carlo simulations, which highlighted superior adsorption properties and protective capabilities of TTB compared to traditional inhibitors. These results demonstrate the potential of TTB as an effective corrosion inhibitor in industrial applications, particularly in the oil and gas sector.