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

Abstract

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.

Inventors:
 [1];  [1];  [1]
  1. Oak Ridge, TN
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1014936
Patent Number(s):
7829194
Application Number:
US Patent Application 11/582,034
Assignee:
UT-Battelle, LLC (Oak Ridge, TN)
Patent Classifications (CPCs):
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01M - PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Patent
Country of Publication:
United States
Language:
English

Citation Formats

Brady, Michael P, Yang, Bing, and Maziasz, Philip J. Iron-based alloy and nitridation treatment for PEM fuel cell bipolar plates. United States: N. p., 2010. Web.
Brady, Michael P, Yang, Bing, & Maziasz, Philip J. Iron-based alloy and nitridation treatment for PEM fuel cell bipolar plates. United States.
Brady, Michael P, Yang, Bing, and Maziasz, Philip J. Tue . "Iron-based alloy and nitridation treatment for PEM fuel cell bipolar plates". United States. https://www.osti.gov/servlets/purl/1014936.
@article{osti_1014936,
title = {Iron-based alloy and nitridation treatment for PEM fuel cell bipolar plates},
author = {Brady, Michael P and Yang, Bing and Maziasz, Philip J},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {11}
}

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Works referenced in this record:

Hot Isostatic Pressing of Chromium Nitrides (Cr2N and CrN) Prepared by Self-Propagating High-Temperature Synthesis
journal, September 2001


The development of Cr2O3 scales on iron-chromium alloys containing reactive elements
journal, January 1989


High-temperature nitridation of Ni-Cr alloys
journal, January 1996


Effect of Surface Nitriding on Corrosion Resistance of Chromium in Sulfuric Acid Solution
journal, January 1991


Microstructural Evolution in the Oxidized Chromium Nitride Coatings Prepared by Unbalanced Magnetron Sputtering
journal, January 2003


Thermodynamic characteristics and numerical modeling of internal nitridation of nickel base alloys
journal, November 2003


A study of the corrosion behaviour and protective quality of sputtered chromium nitride coatings
journal, April 2000