Electrochemical Isolation and Determination of GCP Phase in a Fe-Cr-Ni Alloy

摘要

Geometrical Close Packed (GCP) phase in Fe-Cr-Ni alloy was quantitatively isolated and precisely determined when electrolyzed in 10% H_3PO_4 electrolyte at a low current density of 5 mA/cm~2 and 22℃ ± 1℃. The transpassive dissolution potential of the alloy matrix under above conditions is about 1 140 mV (SCE), at which GCP phase is in passive state and can be isolated from the alloy.