Inhibition of corrosion of mild steel by nitrite in aqueous solution in presence of aggressive ions

218-222The potentiality of sodium nitrite as corrosion inhibitor for mild steel in aqueous solution of sodium chloride and magnesium sulphate, containing nitrite as inhibitor is reported here. The inhibition appears to function through general adsorption on the surface of mild steel. The thermodynamic parameters such as activation energy, heat of adsorption and free energy of adsorption have been calculated to determine the mechanism of adsorption of the inhibitor. Along with, potentiostatic parameters, viz. open circuit potential (OCP), corrosion potential (Ecorr ), corrosion current (Icorr) Tafel slopes and corrosion rate have also been determined