Abstract
The corrosion performance of Carbon steel in HCl solution with different concentration of synthesized Pyridazinium-based Ionic liquids namely: 1-(2-(4-nitrophenyl)-2-oxoethyl) pyridazinium bromide NPEPB, was investigated by electrochemical measurements and weight loss. The obtained results reveal that NPEPB performs excellently as good corrosion inhibitor for Carbon steel in 1.0 M HCl. Polarization curves studies indicated that NPEPB behaves as mixed-type inhibitors. The calculated inhibition efficiencies from weight loss measurements, show the same evolution as those obtained from electrochemical studies. Also, the inhibition efficiency was found to increase with increase of the inhibitor concentrations to reach 85 % at 10-3M of NPEPB due to the adsorption of the inhibitors molecule on the electrod surface. Impedance measurements spectra exhibit one capacitive and valid the inhibitive ability. confirming that this inhibitor inhibits the corrosion in 1 M HCl through adsorption process following Langmuir adsorption isotherm. Some thermodynamic functions of the carbon steel dissolution process in acid medium were also determined and discussed.