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Paper Details

Inhibition of Corrosion of Stainless Steel by Sodium Tungstate Zn (II) System

P. Patric Raymond1*, A. Peter Pascal Regis1, S. Rajendran2, 3 and M. Manivannan4

Journal Title:Journal of Chemical, Biological and physical sciences

The inhibition efficiency (IE) of sodium tungstate (ST) in controlling corrosion of stainless steel 410 in sea water in the absence and presence of Zn2+ has been evaluated by weight loss method. The formulation consists of 250 ppm of ST and 50 ppm of Zn2+ has 98% IE. It is found that the IE of ST increases by the addition of Zn2+. A synergistic effect exists between ST and Zn2+. Synergism has been confirmed by synergism parameter and F-test. The mechanistic aspects of corrosion inhibition have been studied using polarization study. Also FTIR spectra reveal that the protective film consists of Fe2+ - ST complex and Zn(OH)2. The nature of the protective film has been characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM).