| 摘要 |
The invention relates to a bipolar plate (1) consisting of a chromium oxide-forming alloy with an electrically insulating, corrosion-reducing layer in the region of the gas guiding surfaces (3). Said layer has a mixed oxide layer on the electrode contact surface (5) to improve the conductitivy and reduce the evaporation rate. The invention also relates to a process for producing the bipolar plate in which a chromium oxide-forming alloy is used as the plate material and an electrically insulating, corrosion-reducing surface coating is applied in the region of the gas guiding surfaces. The surface is then electrochemically coated with metals from which is formed an oxide layer of high conductivity and low evaporation rate in comparison with the chromium oxide-forming alloy when used in the fuel cell. The invention also relates to a plate consisting of a chromium oxide-forming alloy with cobalt, nickel or iron enrichment layers in the region of the electrode contact surface. |
