Syneristic effect of C. Papaya Leaves Extract-Zn 2+ in Corrosion Inhibition of Mild Steel in Aqueous Medium

The corrosion inhibition of aqueous extract of C. Papaya leaves on mild steel in 60 ppm Cl - ion containing aqueous medium was studied by using inhibition efficiency and degree of surface coverage. The most suitable inhibitor concentration was found to be 2 ml of C. Papaya leave extract with inhibition efficiency (IE) of 91% at Zn 2+ (50 ppm) by the weight loss method. Synergism parameters have been calculated to evaluate the synergistic effect existing between C. Papaya leave extract and Zn 2+ . The influence of immersion time and P H has also been investigated. The protective film has been analyzed using Fourier transform infrared (FTIR) spectroscopy.

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