Journal of Chemical and Pharmaceutical Research (ISSN : 0975-7384)

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Original Articles: 2012 Vol: 4 Issue: 10

Inhibitive properties of THAM-Zn2+ system and its synergism with ST

Abstract

The synergistic effect of THAM-Zn2+ and ST on the inhibition of corrosion of mild steel in aqueous solution containing 60 ppm Cl- has been evaluated by the weight loss method. The mechanistic aspects of corrosion inhibition have been studied using potentiostatic polarization study, AC impedance spectra. The formulation consisting of 50 ppm of Tris (hrdroxy methyl) amino methane (THAM) and 50 ppm of Zn2+ and 250 ppm of sodiumtungstate (ST) has 73% corrosion inhibition efficiency. Synergism parameters have been calculated to evaluate the synergistic effect.