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The pitting corrosion behavior of the austenitic stainless steel in aqueous  chloride solution was investigated using electrochemical technique.  Corrosion potential (Ecorr) measurement, potentiodynamic experiments,  potential-hold experiments in the passive range, and microscopic examination  were used for the evaluation of corrosion characteristics. The experimental  parameters were chloride ion concentration, immersion time and anodic-hold  potential. Ecorr measurements along with microscopic examinations suggest  that in or above 3.5 % NaCl at pH 2 pitting took place on the surface in  absence of applied potential after 6 hour immersion. The potentiodynamic  experiment reveals that Ecorr and pitting potential (Epit) decreased and  current density in the passive region increased with the increase of  chloride ion concentrations. A linear relationship between Epit and chloride  ion concentrations was found in this investigation. The analysis of the  results suggests that six chloride ions are involved for the dissolution of  iron ion in the pitting corrosion process of austenitic stainless steel

Effects of concentration of sodium chloride solution on the pitting corrosion behavior of AISI 304L austenitic stainless steel