Abstract
The electrochemical Potentiokinetic Reactivation method (EPR) which evaluates the intergranular corrosion susceptibility of stainless steel was applied to the intergranular corrosion test of Type 316SS in saturated ammonium sulfate solutions with different pH at 80°C. The corrosion behavior was evaluated with the critical passivation current (Ia), the maximum reactivation current (Ir), and the reactivation ratio (Ia/Ir). The immersion test of the specimens, both solution-treated and sensitized, was conducted for 150hrs, and the surface was observed by a scanning electron microscope (SEM). Type 316SS was attacked by the test solution when the solution pH was lower than 2. The corrosion was stimulated by sensitization of heat treatment at 650°C, that is, the reactivation ratio was as high as 40%. It is concluded that the EPR method is feasible to evaluate the intergranular corrosion of austenitic stainless steel in corrosive chemicals.
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