THE CORROSION INHIBITION OF ISONICOTINAMIDE (ISN) - Zn2+ SYSTEM CONTROLS THE CORROSION OF CARBON STEEL IN 1N HYDROCHLORIC ACID SOLUTION

摘要

The corrosion inhibition efficiency of Isonicotinamide (ISN) in controlling the corrosion of carbon steel in one normal(1N) hydrochloric acid solution(HCl) in absence and presence of Zn 2+ has been studied by weight loss method. Weight Loss study reveals that the formulation consisting of 10 ppm of ISN and 10 ppm of Zn 2+ has 78% inhibition efficiency. The results of polarisation study shows that the formulation function controls the anodic reaction predominantly. The AC impedance spectra reveal that a protective film formed on the metal surface. FTIR spectrum reveal that the protective film consists of Fe 2+ -ISN complex on the anodic sites of metal surface and Zn(OH) 2 formed on cathodic sites of metal surface.