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Title: Corrosion resistant metallic bipolar plate

Abstract

A corrosion resistant, electrically conductive component such as a bipolar plate for a PEM fuel cell includes 20 55% Cr, balance base metal such as Ni, Fe, or Co, the component having thereon a substantially external, continuous layer of chromium nitride.

Inventors:
 [1];  [2];  [2];  [1]
  1. Oak Ridge, TN
  2. Knoxville, TN
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
Sponsoring Org.:
USDOE
OSTI Identifier:
909142
Patent Number(s):
7,211,346
Application Number:
10/403,472
Assignee:
UT-Battelle, LLC (Oak Ridge, TN) ORO
DOE Contract Number:
AC05-00OR22725
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Brady, Michael P, Schneibel, Joachim H, Pint, Bruce A, and Maziasz, Philip J. Corrosion resistant metallic bipolar plate. United States: N. p., 2007. Web.
Brady, Michael P, Schneibel, Joachim H, Pint, Bruce A, & Maziasz, Philip J. Corrosion resistant metallic bipolar plate. United States.
Brady, Michael P, Schneibel, Joachim H, Pint, Bruce A, and Maziasz, Philip J. Tue . "Corrosion resistant metallic bipolar plate". United States. doi:. https://www.osti.gov/servlets/purl/909142.
@article{osti_909142,
title = {Corrosion resistant metallic bipolar plate},
author = {Brady, Michael P and Schneibel, Joachim H and Pint, Bruce A and Maziasz, Philip J},
abstractNote = {A corrosion resistant, electrically conductive component such as a bipolar plate for a PEM fuel cell includes 20 55% Cr, balance base metal such as Ni, Fe, or Co, the component having thereon a substantially external, continuous layer of chromium nitride.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}

Patent:

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  • A corrosion resistant, electrically-conductive, durable plate at least partially coated with an anchor coating and a corrosion resistant coating. The corrosion resistant coating made of at least a polymer and a plurality of corrosion resistant particles each having a surface area between about 1-20 m.sup.2/g and a diameter less than about 10 microns. Preferably, the plate is used as a bipolar plate in a proton exchange membrane (PEMFC) fuel cell stack.
  • This report describes a 24-month effort in the development of a corrosion resistant hardware material for molten carbonate fuel cell (MFC) application. The objective of this program was to identify an inexpensive alloy for MCFC current collector/bipolar plate application. For this work, 310S was selected as the base alloy composition and La, Ce and Si were added to improve corrosion resistance. Eight candidate alloys, including 310S and 316L, were screened in MCFC anode and cathode atmospheres. The techniques used include isothermal corrosion, acoustic emission, thermal cycling corrosion, thermogravimetric analyses, electrical surface resistance, and dual atmosphere corrosion testing. Oxide scales formedmore » were analyzed by standard metallographic techniques. The results indicate that COLT-25+ and Crutemp-25 alloys (both containing 25Cr-25Ni and balance Fe) have the best corrosion resistance in the MCFC environment. Rare earth additives, La and Ce, do not appear to improve isothermal or thermal cycling resistance a great deal. Silicon addition appears to improve thermal cycling but not isothermal corrosion resistance. High Mn content (approx.18%) appears detrimental based on this limited investigation. Currently used 316L has the least corrosion resistance of all the alloys tested. Pressurized tests have shown that high pressure (10 atm) reduces corrosion rate in the anode atmosphere whereas it only slightly affects corrosion rate in the cathode atmosphere. 37 refs., 47 figs., 12 tabs.« less
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  • An electrically conductive laminate composition for fuel cell flow field plate or bipolar plate applications. The laminate composition comprises at least a thin metal sheet having two opposed exterior surfaces and a first exfoliated graphite composite sheet bonded to the first of the two exterior surfaces of the metal sheet wherein the exfoliated graphite composite sheet comprises: (a) expanded or exfoliated graphite and (b) a binder or matrix material to bond the expanded graphite for forming a cohered sheet, wherein the binder or matrix material is between 3% and 60% by weight based on the total weight of the firstmore » exfoliated graphite composite sheet. Preferably, the first exfoliated graphite composite sheet further comprises particles of non-expandable graphite or carbon in the amount of between 3% and 60% by weight based on the total weight of the non-expandable particles and the expanded graphite. Further preferably, the laminate comprises a second exfoliated graphite composite sheet bonded to the second surface of the metal sheet to form a three-layer laminate. Surface flow channels and other desired geometric features can be built onto the exterior surfaces of the laminate to form a flow field plate or bipolar plate. The resulting laminate has an exceptionally high thickness-direction conductivity and excellent resistance to gas permeation.« less