Anticorrosion Potential of Hydralazine for Corrosion of Mild Steel in 1M Hydrochloric acid Solution

Anticorrosion potential of mild steel by Hydralazine as corrosion inhibitor for mild steel in 1M hydrochloric acid was investigated by chemical and electrochemical measurements at 303-333 K temperature. The maximum inhibition efficiency of inhibitor by weight loss method was obtained was around 90%,Tafel polarization method was around 85%, electrochemical impedance spectroscopy measurement was around 90% at 1250 ppm of Hydralazine in 1M hydrochloric acid.The result shows that the inhibition efficiency increases with increasing inhibitor concentration. Hydralazine acts as a mixed type inhibitor which inhibits the corrosion of mild steel due to the adsorption on metal surface. This adsorption system obeys the Langmuir adsorption isotherm. Activation parameters explains the effect of temperature with inhibition efficiency of inhibitor molecule.SEM images of inhibited mild steel strips shows a formation of passive protective film over the metal surface.