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

被引:75
作者
Lee, S. B. [1 ]
Cho, K. H. [1 ]
Lee, W. G. [1 ]
Jang, H. [1 ]
机构
[1] Korea Univ, Coll Engn, Dept Mat Sci & Engn, Seoul 136713, South Korea
关键词
Bipolar plates; PEMFC; Chromizing; Corrosion; Stainless steel;
D O I
10.1016/j.jpowsour.2008.11.064
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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. (C) 2008 Elsevier B.V. All rights reserved.
引用
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页码:318 / 323
页数:6
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