Comparative Account of Jatropha curcas on Brass (Cu-40Zn) in Acid and Sea Water Environment

ABSTRACT The inhibition efficacy of alcoholic leaf extract of Jatropha curcas on Brass (Cu-40Zn) in 1N Hydrochloric Acid and natural sea water environment are carried out using mass loss measurements. Experiments are performed by varying immersion period, concentration of the inhibitor and temperature. The inhibition efficiency is markedly higher in addition of Jatropha curcas leaves extract in both media and compared with those in the inhibitor free solution. The inhibition efficiency increased with an increase of inhibitor concentration but decreased with rise in temperature and exposure time. Corrosion inhibition may be due to the spontaneous physical adsorption of the plant constituents on the surface of Brass. Experimental data fitted with the Langmuir and Frumkin adsorption isotherms. Comparing the corrosion product on the surface of Brass in the presence of inhibitor at both environments is studied by UV and IR spectra