Oxidation Studies on Crofer 22 APU Alloy Under Simulated SOFC Operating Conditions

The oxidation of Crofer 22 APU was studied under simulated SOFC interconnection operating conditions. Crofer 22 APU samples were exposed to cathodic conditions, i.e. air on one side, and anodic conditions, i.e. fuel (hydrogen) on the other side, with an externally imposed current flow simulating the passage of current. Preliminary results indicate that the composition of the oxide scale formed on the fuel side of the alloy with the externally imposed current flow was significantly different from that of the oxide scale formed when there was no current flow. However, the results indicate that the current flow has no significant effect on the composition of the oxide scale on the air side.