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During the operation of a solid oxide fuel cell stack with metallic interconnect plates, oxide scales are formed at the surface of the interconnect material leading to an electrical insulating effect. In the present work, the electrical contact resistance between different ferritic interconnect steels and contact materials was studied at 800°C as a function of aging time. The contact materials consisting of a perovskitetype oxide and Ni mesh were tested under cathodic (air) and anodic (Ar/4doi:10.1149/200116.0895pv fatcat:mlribmdodbatne5gbnfwwcd73m