Stock material or miscellaneous articles – Composite – Of metal
Reexamination Certificate
2006-10-17
2010-11-09
McNeil, Jennifer C (Department: 1784)
Stock material or miscellaneous articles
Composite
Of metal
C428S698000, C427S126100, C429S006000, C429S006000
Reexamination Certificate
active
07829194
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.
REFERENCES:
patent: 3837894 (1974-09-01), Tucker, Jr.
patent: 3841847 (1974-10-01), Jones et al.
patent: 4882124 (1989-11-01), Uehara et al.
patent: 5328529 (1994-07-01), Cordea et al.
patent: 5445683 (1995-08-01), Tahara et al.
patent: 5683828 (1997-11-01), Spear et al.
patent: 5798188 (1998-08-01), Mukohyama et al.
patent: 2001/0039984 (2001-11-01), Nomomura et al.
patent: 2002/0057984 (2002-05-01), Speidel et al.
patent: 2002/0081478 (2002-06-01), Busenbender
patent: 2003/0190515 (2003-10-01), Brady et al.
patent: 2005/0238873 (2005-10-01), Brady et al.
C.C. Wang et al. Journal of the Electrochemical Society, Mar. 2003, 150 (5), B199-B204.
Brady et.al. JOM, Aug. 2006, p. 50-57.
Krupp et al. “Ocurrence of the Ternary pi Phase During Nitriding of Ni-Cr and Ni-Cr-Ti Alloys and its Thermodynamic Prediction”, Z. Metallkunde, (2000), vol. 91, No. 12, pp. 1006-1012.
Bertrand et al. “A study of the corrosion behaviour and protective quality of sputtered chromium nitride coatings”, Surface and Coatings Technology, (2006), vol. 126, pp. 199-209.
Taguchi et al. “Effect of Surface Nitriding on Corrosion Resistance of Chromium in Sulfuric Acid Solution”, Materials Transactions, JIM, (1991), vol. 32, No. 12, pp. 1170-1176.
Kodenstov et al. “High-Temperature Nitridation of Ni-Cr Alloys”, Metallurgical and Materials Transactions, (1996), vol. 27A, pp. 59-69.
Paulauskas et al. “Corrosion behavior of CrN, Cr sub2 N and pi phase surfaces on nitrided Ni-50Cr for proton exchange membrane feul cell bipolar plates”, Corrosion Science, (2005), 15 pages.
Wang et al. “Microstructural Evolution in the Oxidized Chromium Nitride Coatings Prepared by Unbalanced Magnetron Sputtering”, Journal of the Electrochemical Society, (2003), vol. 150, No. 5, pp. B199-B204.
Wei et al. “The Development of Cr sub 2 O sub 3 Scales on Iron-Chromium Alloys Contain Reactive Elements”, Corros. Sci., (1989), vol. 29, No. 7, pp. 839-861.
Senna et al. “Comparative Study Between the Electrochemical Behavior of TiN, TiC sub x N sub y Hard Coatings by Using Microscopy and Electrochemical Techniques”, Materials Research, (2001), vol. 4, No. 2, pp. 137-141.
Hirota et al. “Hot Isostatic Pressing of Chromium Nitrides (Cr sub 2 N and CrN) Prepared by Self-Propagating High-Temperature Synthesis”, J. Am. Ceram. Soc., (2001), vol. 84, No. 9, pp. 2120-2122.
Christ et al. “Thermodynamic characteristics and numerical modeling of internal nitridation of nickel based alloys”, Materials and Corrosion, (2003), vol. 54, No. 11, pp. 887-894.
Brady Michael P.
Maziasz Philip J.
Yang Bing
Katz Vera
Lefkowitz Gregory M.
McNeil Jennifer C
Nelson Gregory A.
Novak Druce & Quigg LLP
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