Adsorption and corrosion inhibition of new synthesized pyridazinium-based ionic liquid on carbon steel in 0.5 M H2SO4

The corrosion inhibition properties of 1-(2-ethoxy-2-oxoethyl) pyridazinium chloride (eopc) on carbon steel (cs) in sulfuric acid (0.5 m h2so4) solution has been examined and characterized by weight loss,potentiodynamic polarization and electrochemical impedance spectroscopy (eis) measurements. the experimental results reveal that the compound has a good inhibiting effect on the metal tested in 0.5m h2so4 solution. the inhibition efficiency for this compound studied increased with the increase in the inhibitor concentrations to attain 91.67 % at the 10-3 m of eopc. polarization curves showed that eopc acted as a mixed-type inhibitor in sulfuric acid. eis results show that the change in the impedance parameters (rt and cdl) with concentration of eopc is indicative of the adsorption of molecules leading to the formation of a protective layer on the surface of carbon steel. the effect of the temperature on the corrosion behavior with addition of 10-3m of the inhibitor was studied in the temperature range 298-328 k,and the thermodynamic parameters were determined and discussed. the adsorption of this compound on cs surface obeys langmuir's adsorption isotherm.