Method for manufacturing and cleaning a stainless steel fuel cell bipolar plate
AssigneeGM Global Technology Operations LLC
InventorsSmuruthi Kamepalli, Balasubramanian Lakshmanan
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Abstract
A method for manufacturing a coated metal substrate includes the steps of: (1) inserting a substrate with a chromium(III) oxide layer inside a CVD chamber; (2) heating the substrate to a temperature which falls in the range of 400 to 500 degrees Celsius; (3) transporting gaseous nitrogen (N2) and tantalum chloride (TaCl5) into the CVD chamber for at least two cycles; (4) ceasing the transportation of tantalum chloride (TaCl5) while nitrogen continues to flow from the inlet to the outlet; (5) reacting the tantalum chloride and the chromium(III) oxide and creating by-products; and (6) vacuuming the by-product matter from the CVD chamber via the flowing nitrogen gas.
Claims5
A method for manufacturing a corrosion resistant substrate, the method comprising the steps of:
- inserting a stainless steel substrate with a chromium(III) oxide layer inside a CVD chamber;
- heating the stainless steel substrate to a temperature which falls in the range of about 400 to about 500 degrees Celsius;
- transporting gaseous nitrogen (N2) and tantalum chloride (TaCl5) into the CVD chamber for at least two cycles;
- ceasing the transportation of tantalum chloride (TaCl5) while nitrogen continues to flow from the inlet to the outlet;
- reacting the tantalum chloride and the chromium(III) oxide and creating by-products;
- and
- vacuuming the by-product matter from the CVD chamber the flowing N2.
-18. (canceled)
Dependencies are inferred from the claim text.