Iron-based alloy and nitridation treatment for PEM fuel cell bipolar plates

Brady, Michael P; Yang, Bing; Maziasz, Philip J

Iron-based alloy and nitridation treatment for PEM fuel cell bipolar plates

Patent · Mon Nov 08 23:00:00 EST 2010

OSTI ID:1014936

Brady, Michael P ^[1]; Yang, Bing ^[1]; Maziasz, Philip J ^[1]

Oak Ridge, TN

A corrosion resistant electrically conductive component that can be used as a bipolar plate in a PEM fuel cell application is composed of an alloy substrate which has 10-30 wt. % Cr, 0.5 to 7 wt. % V, and base metal being Fe, and a continuous surface layer of chromium nitride and vanadium nitride essentially free of base metal. A oxide layer of chromium vanadium oxide can be disposed between the alloy substrate and the continuous surface nitride layer. A method to prepare the corrosion resistant electrically conductive component involves a two-step nitridization sequence by exposing the alloy to a oxygen containing gas at an elevated temperature, and subsequently exposing the alloy to an oxygen free nitrogen containing gas at an elevated temperature to yield a component where a continuous chromium nitride layer free of iron has formed at the surface.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

Assignee:: UT-Battelle, LLC (Oak Ridge, TN)

Patent Number(s):: 7,829,194

Application Number:: US Patent Application 11/582,034

OSTI ID:: 1014936

Country of Publication:: United States

Language:: English

References (10)

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