期刊
JOURNAL OF POWER SOURCES
卷 273, 期 -, 页码 1237-1249出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.02.053
关键词
Bipolar plates; Stainless steel; Corrosion rates; Contact resistance; Point defect model; PEFC
资金
- Fuel Cell Technologies Office of the U.S. Department of Energy's (DOE) Office of Energy Efficiency and Renewable Energy
- DOE, Office of Science Laboratory by UChicago, Argonne, LLC [DE-AC02-06CH11357]
A potentiostatic polarization method is used to evaluate the corrosion behavior of SS316L in simulated anode and cathode environments of polymer electrolyte fuel cells. A passive barrier oxide film is observed to form and reach steady state within similar to 10 h of polarization, after which time the total ion release rates are low and nearly constant at similar to 0.4 mu g cm(-2) h(-1) for all potentials investigated. The equilibrium film thickness, however, is a function of the applied potential. The main ionic species dissolved in the liquid are predominately Fe followed by Ni, that account for >90% of the steady-state corrosion current. The dissolution rate of Cr is low but increases systematically at potentials higher than 0.8 V. The experimental ion release rates can be correlated with a point defect model using a single set of parameters over a broad range of potentials (0.2-1 V) on the cathode side. The interfacial contact resistance measured after 48 h of polarization is observed to increase with increase in applied potential and can be empirically correlated with applied load and oxide film thickness. The oxide film is substantially thicker at 1.5 V possibly because of alteration in film composition to Fe-rich as indicated by XPS data. (C) 2014 Elsevier B.V. All rights reserved.
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