Active screen plasma surface co-alloying of 316 austenitic stainless steel with both nitrogen and niobium for the application of bipolar plates in proton exchange membrane fuel cells

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

Abstract

Austenitic stainless steel has been researched as a promising candidate material for bipolar plates in proton exchange membrane fuel cells. However, its interfacial contact resistance (ICR) is about 16 times higher that of the Department of Energy (DOE) target (10 mΩ cm2), which leads to undesirable fuel cell performance. In this work, a new hybrid plasma surface engineering process, based on active screen plasma co-alloying, has been developed to simultaneously alloy 316 austenitic stainless steel (316 SS) surfaces with both nitrogen and niobium. The results demonstrated that the layer structure of the modified surfaces can be tailored by adjusting the treatment conditions. All the plasma treated 316 SS samples exhibited significantly reduced ICR below the DOE target of 10 mΩ cm2. The corrosion resistance of the N/Nb co-alloyed 316 SS was much better than active screen plasma nitrided and marginally better than the untreated material.

Details

Original languageEnglish
Pages (from-to)10281–10292
JournalInternational Journal of Hydrogen Energy
Volume40
Issue number32
Early online date2 Jul 2015
Publication statusPublished - 24 Aug 2015

Keywords

  • Proton exchange membrane fuel cells, Bipolar plates, 316 stainless steel, Active screen plasma surface alloying, Nitrogen, Niobium