On the Passivation of 349TM Stainless Steel in Simulated PEMFC Cathode Environment

Heli Wang, John A. Turner

Research output: Contribution to conferencePaperpeer-review

11 Scopus Citations


Austenite stainless steel 349™ has been tested in a simulated polymer electrolyte membrane fuel cell (PEMFC) cathode environment, and a stable passive film was formed within 15 minutes of polarization. X-ray photoelectron spectroscopy (XPS) has been utilized to investigate these surface films on the steel. The surface oxide film formed in air (air-formed film) was composed of iron oxides and chromium oxide, with a Fe-rich outer layer and a Cr-rich inner layer. Neither of them was a dominating species in the air-formed film. On the other hand, the passive film formed in the simulated PEMFC cathode environment was dominated by Cr-oxide. The thickness of the films was estimated to be 2.4 nm for air-formed film, and 3.0 nm for the passive film. The difference in morphology between fresh and passived steels was identified by means of atomic force microscopy (AFM). copyright The Electrochemical Society.

Original languageAmerican English
Number of pages10
StatePublished - 2006
Event208th Meeting of the Electrochemical Society - Los Angeles, CA, United States
Duration: 16 Oct 200521 Oct 2005


Conference208th Meeting of the Electrochemical Society
Country/TerritoryUnited States
CityLos Angeles, CA

NREL Publication Number

  • NREL/CP-560-39103


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