CORROSION INHIBITION OF MILD STEEL INSULFURIC ACID SOLUTION IN THE PRESENCE of SOME SCHIFF BASE COMPOUNDS

CORROSION INHIBITION OF MILD STEEL INSULFURIC ACID SOLUTION IN THE PRESENCE of SOME SCHIFF BASE COMPOUNDS

The inhibition performance of three Schiff bases of the mild steel in 0.5 M sulfuric acid solution was investigated using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, weight loss and FTIR spectroscopy methods. The results revealed that these compounds exhibit good corrosion inhibition. The effect of temperature (25-55οC) on corrosion parameters was examined. Polarization curves showed that all of the compounds are mixed type inhibitors. The adsorption of inhibitors on the surface obeys Langmuir adsorption isotherm. The values of activation energy and the thermodynamic parameters, such as ΔGads, ΔHads and ΔSads were calculated.