Synthesis and characterization of new ethoxylated carbohydrate based surfactants for corrosion inhibition of low LCS steel in aqueous solutions

Abstract

The heterocyclic compounds, mainly carbohydrate-based surfactant, 1, 4 Sorbitan, namely (Sorbitan Mono-stearate with 20 moles of Ethylene oxide SMS-20-EO, Sorbitan Mono-oleate SMO, and Sorbitan Mono-oleate ethoxylated with 20 moles of Ethylene oxide SMO-20-EO ) have been synthesized and characterized through different spectroscopic methods (FTIR,1 H NMR). Then estimated as corrosion inhibitors of low LCS (LCS) in the aggressive environment 1 M HCl utilizing a weight loss (WL), the destructive and destructive electrochemical techniques. The surface examination was tested using several techniques. The new ethoxylated carbohydrate-based surfactant gave an excellent inhibition performance (IE %). The adsorption of the inhibitors obeys the Langmuir adsorption model. The metal dissolution and inhibitor adsorption phenomena have been studied via the estimation of thermodynamic parameters, which describe the adsorption properties of SMO, SMO-20-EO, and SMS-20-EO.