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The electrochemical behavior of mild steel in sulfide polluted NaCl at different velocities

Abstract:

This paper studies the effect of solution speed and sulfide ion concentration present as a pollutant in 3.5% NaCl solution on the electrochemical behavior of mild steel. The weight loss/gain due to the interaction of the materials with the surrounded environments was calculated after rotating cylindricalshape mild steel samples in sulfide polluted NaCl solution for 24 hrs at a speed of 0, 300, 600 and 900 ppm using a rotating disc electrode at room temperature. The effect of pollutant concentrations due to presence of sulfide ions on the electrochemical behavior was studied in NaCl solution containing 0.001, 0.005 and 0.010 M Na2S. The presence of sulfide ions in NaCl solution enhanced the corrosion attack due to the localized replacement of the protective Fe-oxide film by a non-protective iron sulfide film. On the other hand, increasing the solution speed in presence of sulfide ions increased the corrosion attack which can be explained in the light of the synergistic action between the presence of sulfide and increasing the solution speed. © 2008 by ESG.