The Effect of Water Vapour on the Corrosion of Sandvik Sanergy HT Under Dual Atmosphere Conditions

作者：Skilbred Anders Werner Bredvei; Haugsrud Reidar^*

来源：Oxidation of Metals, 2013, 79(5-6): 639-654.

DOI：10.1007/s11085-012-9313-7

• Interconnect
• Dual atmosphere
• Sandvik Sanergy HT
• Metallic coating
• PCFC
• SOFC

Interconnects of PCFC and SOFC are exposed to dual atmosphere conditions; fuel (e.g. H-2) on the anode side and air on the cathode side. Sandvik Sanergy HT has been investigated under simulated fuel cell conditions at high temperatures. The microstructure and composition of the oxide scales formed at the cathode side (air) were significantly influenced by dual atmosphere conditions. The main effect was a substantial increase of Fe in the oxide scales by the formation of Fe rich nodules accompanied by localized metal loss. The size and number of the nodules increased when introducing water vapour on the air side of the samples. It is suggested that the preferred localization of nodule formation is given by the surface finish as a result of fabrication (e.g. grooves and scratches). By increasing the reaction temperature or duration of the exposures, the effect of dual atmosphere conditions became less pronounced. Alterations to the oxidation mechanism as a consequence of dual atmosphere environments are discussed with basis in the effect of hydrogen permeation through the interconnect alloy. Samples PVD coated with a double layer of metallic Ce and Co were also tested under single and dual atmosphere conditions. No significant change was found in the oxidation behaviour by dual atmosphere exposures.

• 出版日期2013-6