Adsorption and Inhibitive Efficacy of Tamanu Oil Extract on Brass (Cu-40Zn) in acid media
P. Deepa Rani and S. Selvaraj
Journal Title:Journal of Chemical, Biological and physical sciences
The inhibitive efficacy of Calophyllum inophyllum seed oil on brass (Cu-
40Zn) in 1N Hydrochloric acid environment is carried out by using mass loss
measurements. Experiments are performed by varying immersion period, inhibitor
concentration and temperature. The value of corrosion rate is significantly reduced in
addition of Calophyllum inophyllum seed oil in acid media and compared with those in
the inhibitor free solution. The inhibition efficiency is increased with 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 main
active plant constituents on the surface of brass. Experimental data fitted with the
Langmuir and Frumkin adsorption isotherms. The corrosion product on the metal surface
in the presence and absence of inhibitor is analysed by UV and FTIR spectral studies.
The active complex formed on the metal surface in the presence of inhibitor is also
confirmed by XRD studies.