Abstract
The effects of electrolyte composition and concentration on the reactivation behavior of Alloy 600 in H 2SO 4+KSCN solution were investigated by conducting single-loop electrochemical potentiokinetic reactivation (SL-EPR) tests. The experimental results revealed that two anodic peaks existed, which corresponded to pitting corrosion and matrix corrosion, respectively, in the reactivation polarization curve of non-sensitized Alloy 600. Alternately, for sensitized Alloy 600, an additional peak associated with grain boundary corrosion appeared in the potential range of +60 to −10 mV SCE within the reactivation polarization curve. The shape and current density of the reactivation curve of Alloy 600 with different degrees of sensitization varied with the electrolyte composition adjustments. A maximum peak anodic current density associated with grain boundary corrosion occurred when the concentration ratio of H 2SO 4/KSCN was 10 for the sensitized low carbon Alloy 600.
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