Three novel diquaternary ammonium salts with alkanediyl spacers of varying chain length were synthesized, and their corrosion inhibition effects on N80 steel in 15 wt % HCl solution were studied by weight loss measurement, electrochemical polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDX). The results indicated that the inhibition efficiency increased with the inhibitor concentration and the length of hydrophobic spacer of the inhibitor. At 90 °C, the inhibition efficiency of diquaternary ammonium salt N,N′-octane-1,8-diyl-bisquinolinium dibromide reached about 91% at the inhibitor concentration of 0.01 mol/L. Potentiodynamic polarization curves indicated that all synthesized compounds acted as mixed-type inhibitors. The inhibition mechanism involved the formation of an inhibitor protective layer on the N80 steel surface by a Langmuir-type adsorption process. The presence of Br and N in chemical composition detected by EDX confirmed the adsorption of inhibitors on the N80 steel surface.
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