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RESEARCH PAPERS

Corrosion Study on Different Types of Metallic Bipolar Plates for Polymer Electrolyte Membrane Fuel Cells

[+] Author and Article Information
R. F. Silva

 ENEA, C.R. Casaccia, Via Anguillarese 301, 00060, S. Maria di Galeria (Rome), Italy

A. Pozio1

 ENEA, C.R. Casaccia, Via Anguillarese 301, 00060, S. Maria di Galeria (Rome), Italyalfonso.pozio@casaccia.enea.it

1

Corresponding author.

J. Fuel Cell Sci. Technol 4(2), 116-122 (Jun 08, 2006) (7 pages) doi:10.1115/1.2713768 History: Received November 29, 2005; Revised June 08, 2006

Three different types of metallic bipolar plates (commercial stainless steels, Ni-based alloys, and nitride-coated steels) were investigated in terms of their interface contact resistance (ICR) and corrosion resistance in conditions typical of a proton exchange membrane fuel cell environment. The results showed that stainless steels are unsuitable because of the formation of nonconductive oxide that leads to high ICR. Ni-based alloys showed to be prone to corrosion in acidic medium, although they have an ICR comparable to commercially available graphite. Endurance tests carried out on nitride-coated stainless-steel specimens showed a low ICR and very good corrosion resistance of this material.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic illustration of the test assembly for measurement of the interfacial contact resistance

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Figure 2

Interfacial contact resistance (엯) of commercial SS304, SS310S, SS316, and SS904L, and BMA5 and XM9612 graphites at a compaction force of 220Ncm−2. [Fe+Cr] amount (in weight percent) by EDX is also reported for stainless steel (●).

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Figure 3

Interfacial contact resistance (엯) of C-2000B, C-22, C-276, and G-30 alloys, and BMA5 and XM9612 graphites at a compaction force of 220Ncm−2. [Fe+Cr] amount (in weight percent) by EDX is also reported for stainless steel (●).

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Figure 4

Interfacial contact resistance of as-received SS304 and PVD-coated SS304 (coatings A, B, C, D, E, and F) at a compaction force of 220Ncm−2

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Figure 5

Interfacial contact resistance before and after corrosion endurance tests of SS304, SS904L, C-276, and SS304/F specimens at a compaction force of 220Ncm−2

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Figure 6

SEM micrographs of a SS304 specimen before (a) and after (b) 220hr corrosion endurance test

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Figure 7

SEM micrographs of a SS904L specimen before (a ) and after (b) 220hr corrosion endurance test

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Figure 8

SEM micrographs of a C-276 specimen after 220hr corrosion endurance test

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Figure 9

SEM micrographs of SS304/F specimen before (a) and after (b) 220hr corrosion endurance test

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Figure 10

Polarization curves at 0.33mV∕s of SS304 (- - -), SS304/F (—), and C-276 (∎) specimens in 10−3MH2SO4+1.5×10−4MHCl+15ppm HF purged with air at 25°C

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Figure 11

Interfacial contact resistance before and after corrosion endurance test for SS304, SS904L, C-276, and SS304/F specimens at a compaction force of 220Ncm−2

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Figure 12

Polarization curves at 0.33mV∕s of SS304 (∎) and SS304/F (—) specimens in 10−3MH2SO4+1.5×10−4MHCl+15ppm HF purged with H2 at 25°C

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Figure 13

Cell voltage versus time of a 16cm2 single cell with SS304/F plates as anode and cathode current collectors, at 250mAcm−2, Tcell=60°C, under H2∕Air flux 1.1∕1.1barabs

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