INFLUENCE OF CASSIA ALATA LEAVES ON ALUMINIUM IN 1.0N HYDROCHLORIC ACID

Abstract

The inhibitive nature of alcoholic extract of Cassia alata leaves toward the corrosion of aluminum in 1N HCl was investigated by using mass loss measurement with various contact period and temperature. The observed results suggest that the percentage of inhibition efficiency is enhanced with increase of inhibitor concentration and temperature. In temperature studies, the adsorption of inhibitor on the metal surface takes place through chemisorptions process. The calculalated values of ∆Hads, ∆Gads suggests that the adsorption may be endothermic and spontaneous process. It was found out that the adsorption of CAL inhibitor follows Langmuir adsorption isotherm. Also the protective film formed on the metal surface may confirmed by UV, FT-IR and EDX spectral studies.