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US 2004/0106029 A1Published application
Corrosion resistant coated fuel cell bipolar plate with filled-in fine scale porosities
AssigneeHybrid Power Generation Systems, LLC
InventorsZafar Iqbal, Dave Narasimahan, James V. Guiheen, Timothy Rehg
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Abstract
A corrosion resistant coated fuel cell plate and method of making the same are embodied in a metal plate provided with a multilayered conductive coating and then with an overcoat which fills in fine scale porosities in the coating. In one preferred embodiment, the overcoating is amorphous graphite applied through a deposition process. In another preferred embodiment, overcoating is a thin layer of oxide created by chemical anodization process.
Claims30
A coated fuel cell bipolar plate comprising:
- a metal plate;
- an electrically conductive corrosion resistant coating formed over the metal plate, the coating including a top surface and porosities;
- and
- an electrically conductive overcoating formed over the electrically conductive corrosion resistant coating, the overcoating sealing some or all of the porosities at the top surface of the electrically conductive corrosion resistant coating.
1 more element
A coated fuel cell bipolar plate comprising:
- a metal plate;
- an electrically conductive corrosion resistant coating formed over the metal plate, the electrically conductive corrosion resistant coating including a top surface and porosities;
- and
- an overcoating formed over the electrically conductive corrosion resistant coating, the overcoating being primarily localized on the porosities at the top surface as an amorphous structure.
1 more element
Dependencies are inferred from the claim text.