Abstract
Abstract The electrochemical behavior of austenitic AISI 304 stainless steel (SS) in alcoholic solutions (ethanol, iso-propanol, and t-butanol) containing different concentrations of sulfuric acid (0.001 to 1.0 M) has been investigated using potentiostatic and potentiodynamic techniques. Frequent active-passive transitions are observed and the critical current density (CD) for passivity is found to be dependent on the concentration of acid in ethanol, iso-propanol, and t-butanol solutions. Scanning electron microscopy (SEM) examination of electrode surfaces after the polarization studies showed severe pitting of SS in high concentrations of acid in ethanol, while etch type pitting is found in the case of iso-propanol and t-butanol containing respective concentrations of acid. The different corrosion parameters and pitting potentials have been evaluated. Repassivation has also been observed. The protection potential tended to shift in the noble direction as the scanning rate decreased.
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