Effects of niobium and titanium addition and surface treatment on electrical conductivity of 316 stainless steel as bipolar plates for proton-exchange membrane fuel cells

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Niobium and titanium are added to 316 stainless steel. and then heat treatment and surface treatment are performed on the 316 stainless steel and the Nb- and Ti-added alloys. All samples exhibit enhanced electrical conductivity after surface treatment but have low electrical conductivity before surface treatment due to the existence of non-conductive passive films on the alloy surfaces. In particular, the Nb- and Ti-added alloys experience a remarkable enhancement of electrical conductivity and cell performance compared with the original 316 stainless steel. Surface characterization reveals the presence of small carbide particles on the alloy surface after treatment, whereas the untreated alloys have a flat surface structure. Cr(23)C(6) forms on the 316 stainless steel, and NbC and TiC forms on the Nb- and Ti-added alloys, respectively. The enhanced electrical conductivity after surface treatment is attributed to the formation of these carbide particles, which possibly act as electro-conductive channels through the passive film. Furthermore, NbC and TiC are considered to be more effective carbides than Cr(23)C(6) as electro-conductive channels for stainless steel. (C) 2008 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2009-02
Language
English
Article Type
Article
Keywords

MINOR ALLOYING ELEMENTS; SULFURIC-ACID; PRECIPITATION; CORROSION; RESISTANCE; STABILITY; NB

Citation

JOURNAL OF POWER SOURCES, v.187, no.2, pp.312 - 317

ISSN
0378-7753
DOI
10.1016/j.jpowsour.2008.10.133
URI
http://hdl.handle.net/10203/101693
Appears in Collection
MS-Journal Papers(저널논문)
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