Experimental studies of 2-pyridinecarbonitrile as corrosion inhibitor for mild steel in hydrochloric acid solution

摘要

The effect of 2-Pyridinecarbonitrile (2-PCN) was studied on mild steel (MS) corrosion in 0.1 mol L~(-1) HCl by electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR) and potentiody-namic polarization measurements. The surface morphologies of the MS were investigated in the inhibitor-free and in the presence of 10 mmol L~(-1) 2-PCN containing corrosive media, at 120 h exposure period by scanning electron microscopy (SEM). The mechanism of adsorption was determined from the potential of zero charge (E_(pzc)). 2-PCN adsorption on the MS surface obeyed the isotherm of Langmuir and the ther-modynamic parameters K_(adS); ΔG_(ads) were also calculated and discussed.