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The inhibition efficiency (IE) of an aqueous extract of the( Curcuma longa L.) plant material rhizome powder has been used as a corrosion inhibitor in controlling corrosion of carbon steel in sea water, by the weight-loss study, in the absence and presence of Zn 2+ . The main constituent of this plant extract is curcumin. The results show that 93% IE is provided by binary system consisting of 10 mL of curcumin dye (CD) and 50 ppm of Zn 2+ . Polarization study reveals that CD and Zn 2+ system functions as mixed type inhibitor. The nature of the protective film formed on metal surface has been analysed by FTIR spectra.

Curcumin Dye as Corrosion Inhibitor for Carbon Steel in Sea Water