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Development of Metallic Bipolar Plate Material with W-addition in Austenitic Stainless Steel for PEMFC Environment  

Kim, Kwang Min (Pohang University of Science and Technology)
Koh, Sung Ung (Pohang University of Science and Technology)
Kim, Kyoo Young (Pohang University of Science and Technology)
Publication Information
Corrosion Science and Technology / v.5, no.5, 2006 , pp. 153-159 More about this Journal
Abstract
Austenitic stainless steels with addition of various amounts of Mo and W were evaluated in terms of corrosion and contact resistance to determine optimum alloy composition of metallic bipolar plate for PEMFC. The corrosion property was evaluated by both acid fume exposure test at $130^{\circ}C$ and by electrochemical polarization tests in $H_3PO_4$ solution at $80^{\circ}C$. Austenitic stainless steel with proper amount of Mo and W demonstrated not only good corrosion resistance but also low contact resistance. Analyses on the passive film show that partial substitution of Mo by W enhances passive film stability and repassivation property. Test results suggest that austenitic stainless steel with 2 wt%Mo and 4 wt%W has optimum composition for metallic bipolar plate used in PEMFC.
Keywords
metallic bipolar plate; PEMFC; W-addition; corrosion; contact resistance;
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