Materials Transactions Online

Materials Transactions, Vol.51 No.09 (2010) pp.1609-1613
© 2010 The Japan Institute of Metals

Production of Ni65Cr15P16B4 Metallic Glass-Coated Bipolar Plate for Fuel Cell by High Velocity Oxy-Fuel (HVOF) Spray Coating Method

Sung-chul Kim1, Shin-ichi Yamaura1, Yuta Shimizu2, Koji Nakashima2, Takanori Igarashi2, Akihiro Makino1 and Akihisa Inoue1

1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
2Toyohashi Factory, Topy Industries, Ltd., Toyohashi 441-8510, Japan

In this study, the newly designed bipolar plate for proton exchange membrane fuel cells (PEMFC) was produced by spray-coating the Ni65Cr15P16B4 metallic glassy alloy on Al plate. The Ni65Cr15P16B4 metallic glass was adopted as a coating material because of its excellent corrosion resistance and the high velocity oxy-fuel (HVOF) spray coating was used for the metallic glass deposition on the Al plates having a bipolar plate flow field.
The corrosion resistance of the Ni65Cr15P16B4 glassy alloy film produced by the HVOF spray-coating was studied under simulated PEMFC environments. As a result, the Ni65Cr15P16B4 glassy alloy film showed lower corrosion current density than the high-corrosion-resistant stainless steel SUS316L. Then, the electricity generation tests with the single cell having the Ni65Cr15P16B4 glassy alloy-coated bipolar plates produced in this study were conducted. As a result, the single cell with the metallic glass-coated bipolar plates showed very high I-V performance as well as the cell with the carbon bipolar plates. The long time durability tests for 24 h were also conducted at the constant current density of 200 mA·cm-2. As a result, the single cell with the glass-coated bipolar plates showed no voltage drop during the test. So, it was found in this study that the Ni65Cr15P16B4 glassy alloy-coated bipolar plate produced by the HVOF spray-coating have a potential for practical use for the fuel cells.

(Received 2010/4/23; Accepted 2010/6/24; Published 2010/8/25)

Keywords: proton exchange membrane fuel cell, metallic glass, bipolar plate, high velocity oxygen-fuel spray coating

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