Synthesis and Inhibition Behavior of the Quaternary Ammonium Salt-type Tetrameric Surfactant for Corrosion of N80 Steel in HCl Medium

Resumo

The quaternary ammonium salt-type tetrameric surfactant with hydrocarbon chain length of 12 was synthesized, and characterized using FT-IR and ¹H NMR. The inhibition efficiencies for N80 steel in 20% hydrochloric acid were studied by weight loss, potentiodynamic polarization method, electrochemical impedance spectroscopy at 25°C. The results obtained from weigh loss measurements show that it has good inhibitive performance. Polarization data indicates that it acts as a mixed-type inhibitor. The results obtained from EIS exhibit the protective film formed by the adsorption of surfactant molecules on metal surface. The adsorption behavior of surfactants was found to follow the Langmuir adsorption isotherm.