Bipolar plate and process for producing a protective layer on a bipolar plate
AssigneeElringKlinger AG
InventorThomas Kiefer
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Abstract
In order to provide a bipolar plate for a fuel cell unit, wherein the bipolar plate comprises a support layer and a protective layer, wherein the protective layer comprises an at least binary oxide system with at least two different types of metal cations, the protective layer of which reliably reduces chromium evaporation even in long-term operation and which also meets the other requirements set for a bipolar plate, it is proposed that one type of metal cation of the oxide system of the protective layer is Fe.
Claims23
Bipolar plate for a fuel cell unit, wherein the bipolar plate comprises a support layer and a protective layer, wherein the protective layer comprises an at least binary oxide system with at least two different types of metal cations, wherein one type of metal cation of the oxide system of the protective layer is Fe.
Process for producing a protective layer on a bipolar plate for a fuel cell unit comprising the following process steps:
- applying a layer of a protective layer starting material to a support layer of the bipolar plate, wherein the protective layer starting material comprises Fe cations;
- generating a reduced oxygen partial pressure;
- increasing the temperature to a sintering temperature;
- subsequently increasing the oxygen partial pressure;
- cooling the support layer and the protective layer.
Dependencies are inferred from the claim text.