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Paper Details

Thiourea - Zn2+ system as corrosion inhibitor for Carbon Steel in Marine media

M. Manivannan 1 * and S. Rajendran 2,3

Journal Title:Journal of Chemical, Biological and physical sciences
Abstract


The inhibition efficiency (IE) of thiourea (TU) in controlling corrosion of carbon steel in marine media in the absence and presence of Zn2+ has been evaluated by weight loss study. 95 % IE is obtained from the formulation consisting of 200 ppm TU and 50 ppm Zn2+. It is found that the IE of TU increases by the addition of Zn2+ ion. A synergistic effect exists between TU and Zn2+. The mechanistic aspects of corrosion inhibition have been studied using polarization study. Also FTIR spectra reveal that the protective film consists of Fe2+ TU complex and Zn (OH)2. The scanning electron microscopy (SEM) study confirms the protection of carbon steel surface by strong adsorption of TU. From the results of above studies a suitable mechanism for corrosion inhibition is proposed.

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