Influence of fluoride ions on corrosion performance of 316L stainless steel as bipolar plate material in simulated PEMFC anode environments

Ying Yang, Liejin Guo, Hongtan Liu

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Corrosion performance of 316L stainless steel as a bipolar plate material in proton exchange membrane fuel cell (PEMFC) is studied under different simulated PEMFC anode conditions. Solutions of 1 × 10 -5 M H 2SO 4 with a wide range of different F - concentrations at 70 °C bubbled with hydrogen gas are used to simulate the PEMFC anode environments. Electrochemical methods, both potentiodynamic and potentiostatic, are employed to study the corrosion behavior. Scanning electron microscope (SEM) and atomic force microscope (AFM) are used to examine the surface morphology of the specimen after it is potentiostatic polarized in simulated PEMFC anode environments. X-ray photoelectron spectroscopy (XPS) analysis is used to identify the compositions and the depth profile of the passive film formed on the 316L stainless steel surface after it is polarized in simulated PEMFC anode environments. Mott-Schottky measurements are used to characterize the semiconductor passive films. The results of potentiostatic analyses show that corrosion currents increase with F - concentrations. SEM examinations show that no localized corrosion occurs on the surface of 316L stainless steel and AFM measurement results indicate that the surface topography of 316L stainless steel becomes slightly rougher after polarized in solutions with higher concentration of F -. From the results of XPS analysis and Mott-Schottky measurements, it is determined that the passive film formed on 316L stainless steel is a single layer n-type semiconductor.

Original languageEnglish (US)
Pages (from-to)1875-1883
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume37
Issue number2
DOIs
StatePublished - Jan 1 2012

Keywords

  • Bipolar plate
  • Corrosion
  • Passive film
  • Proton exchange membrane fuel cell (PEMFC)
  • Stainless steel

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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