Abstract
Austenitic stainless steel is considered as a candidate material for metallic bipolar plate in PEMFC due to its good mechanical property and reasonably good corrosion resistance. Austenitic stainless steel with addition of various amounts of W was evaluated in terms of corrosion and contact resistance in a simulated PEMFC environment. Results from electrochemical test and contact resistance test showed that addition of W content below 4wt% in the austenitic stainless steel not only improved the corrosion resistance but also reduced the contact resistance. However, W addition above 4wt% increased the amount of precipitates and reduced the corrosion resistance. From XPS analysis, it was confirmed that improvement of the corrosion resistance was due to the formation of stable WO3 as well as to the enhanced amount of MoO42- which acted as an inhibitor.
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