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Effect of Potentiostatic Passivation on Corrosion Resistance of 304 Stainless Steel in Nace Solution

Shampa Dhar, Sujit K Guchhait and P K Mitra

Stainless steel samples (304) were passivized in 1.0 N sulfuric acid at different passivation potentials. Effect of different holding time on the passivation at corresponding passivation potential was also investigated. Corrosion resistance property of the passivated and the bare samples in NACE solution were measured using Tafel extrapolation method. Electrochemical impedance spectroscopy (EIS) tests were conducted to study the stability of the passive layers. Scanning electron microscope (SEM) images of passivated samples were also examined to understand the extent of protection obtained by passivation. Results obtained showed that potentiostatic passivation could serve as a fairly good tool to fight against the pitting corrosion of 304stainless steel in NACE.