Improved corrosion resistance and interfacial contact resistance of 316L stainless-steel for proton exchange membrane fuel cell bipolar plates by chromizing surface treatment

The electrochemical performance and electrical contact resistance of chromized 316 stainless-steel (SS) are investigated under simulated operating condition in a proton-exchange membrane fuel cell (PEMFC). The corrosion resistance of the chromized stainless steel is assessed by potentiodynamic and p...

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Bibliographic Details
Published in:Journal of power sources 2009-02, Vol.187 (2), p.318-323
Main Authors: Lee, S.B., Cho, K.H., Lee, W.G., Jang, H.
Format: Article
Language:English
Subjects:
Applied sciences
Austenitic stainless steels
Bipolar plates
Chromizing
Contact resistance
Corrosion
Corrosion resistance
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fuel cells
Heat resistant steels
PEMFC
Plates
Stainless steel
Stainless steels
Surface treatment
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Summary:The electrochemical performance and electrical contact resistance of chromized 316 stainless-steel (SS) are investigated under simulated operating condition in a proton-exchange membrane fuel cell (PEMFC). The corrosion resistance of the chromized stainless steel is assessed by potentiodynamic and potentiostatic tests and the interfacial contact resistance (ICR) is examined by measuring the electrical contact resistance as a function of the compaction force. The results show that the chromizing surface treatment improves the corrosion resistance of the stainless steel due to the high-chromium concentration in the diffuse coating layer. On the other hand, the excess Chromium content on the surface increases the contact resistance of the steel plate to a level that is excessively high for commercial applications. This study examines the root cause of the high-contact resistance after chromizing and reports the optimum process to improve the corrosion resistance without sacrificing the ICR by obtaining a chrome carbide on the outer layer.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2008.11.064