CORROSION INHIBITOR ALOE VERA – NICKEL SYSTEM
CONTROLLING THE CORROSION OF CARBON STEEL IN
RAIN WATER
A. John Amalraj, J. Wilson Sahayaraj, C. Kumar, Susai Rajendran, A. Peter Pascal Regis, S.K. Selvaraj, R. Mohan.
Abstract
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 Ni2+ has been studied by weight loss method. Weight loss study reveals that the formulation consisting of 5 ml
of AV and 50 ppm of Ni2+ has 98% inhibition efficiency. The results of polarisation study show 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 Fe2+
-AV complex and also Ni2+
-AV complex in the solution. FTIR spectrum
reveal that the protective film consists of Fe2+
-AV complex and Ni(OH)2.
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