Novel Amide-Based Cationic Surfactants as Efficient Corrosion Inhibitors for Carbon Steel in HCl and H2SO4 media

A variety of surface active compounds weresynthesized by the quaternization of some straight chainamide derivatives with triethylamine or pyridine. Theirstructure FT-IR and 1H-NMR spectra were recorded. Inaddition their physical properties and corrosion preventionefficiencies were investigated. All compounds were testedwith steel coupons in acidic media by the gravimetricmethod. As acidic media 1.5 M HCl and 1.5 M H2SO4were used and the corrosion inhibition tests fulfilled atroom temperature for 24 h. Almost all prepared cationicsurfactants showed efficient inhibition around their criticalmicelle concentrations. The effects of HCl concentrationon corrosion inhibition of some synthesized compoundswere also investigated. The corrosion tests were supportedby contact angle measurements.