Corrosion inhibitor-A plant extract
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Date
2010
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Abstract
The efficacy of an acid extract of leaves of Sida rhombifolia.L as corrosion inhibitor for mild
steel in IM phosphoric acid medium, was earned out using weight loss measurements,
polarization and electrochemical impedance spectral studies. Experiments are performed by
varjang iimnersion period, concentration of the inhibitor and temperature. The results showed
variation in inhibition performance of the inhibitor with varying concentration, immersion time
and temperature. The maximum efficiency was found to be 97.48% at 1 %( w/v) concentration
of the inhibitor for the immersion period of 24 hours. Langmuir and Temkin were tested to
describe the adsorption behavior of inhibitor on the mild steel surface. Potentiodynamic
polarization study clearly revealed that inhibitor acts as a mixed type of inhibitor. The results of
the electrochemical impedance study showed a decrease in double layer capacitance as the
adsorption of inhibitor caused structural change at electrode-solution interface.