CORROSION INHIBITOR ALOE VERA – NICKEL SYSTEM CONTROLLING THE CORROSION OF CARBON STEEL IN RAIN WATER

摘要

The corrosion inhibition efficiency of an aqueous extract of Aloe Vera (AV) in controlling the corrosion of carbon steel rain water in absence and presence of with Ni 2+ has been studied by weight loss method. Weight Loss study reveals that the formulation consisting of 5ml of AV and 50 ppm of Ni 2+ has 98% inhibition efficiency. The results of polarisation study shows that the formulation function controls the cathodic reaction predominantly. The AC impedance spectra reveal that a protective film formed on the metal surface. The UV – visible absorption spectra indicates the possibility of formation of Fe 2+ - AV complex and also Ni 2+ - AV complex in the solution. FTIR spectrum reveal that the protective film consists of Fe 2+ -AV complex and Ni (OH)2.