Corrosion protection of cast iron in drinking water with harmless ternary inhibitor

The protection of corrosion of cast iron in drinking water using curry leaf extract (CLE), Zinc ions and Sodium Tartrate (ST) was investigated using classical weight-loss measurement, Tafel polarization and Nyquist impedance methods. Inhibition efficiency of above ternary inhibitor reaches maximum values at 85%. The shape of DC polarization profile revealed the new ternary system which acts as anodic type inhibitor. AC impedance spectroscopic studies indicated the formation of a protective film onto the metal surface in the presence of inhibitors. Analyses of the protective film using scanning electron microscope and energy dispersive X-ray analysis.