Electrochemical Properties of Tungsten-Alloying-Modified AISI 430 Stainless Steel as Bipolar Plates for PEMFCs used in Marine Environment

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• 作者：Jin-Long Cui ; Zhen-Dong Yao ; Yong-Fu Cui…
• 关键词：Tungsten alloying layer ; Corrosion resistance ; Proton exchange membrane fuel cell ; Interfacial contact resistance ; Bipolar plates
• 刊名：Acta Metallurgica Sinica (English Letters)
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：29
• 期：10
• 页码：920-927
• 全文大小：1,240 KB
• 刊物主题：Metallic Materials; Spectroscopy/Spectrometry; Organometallic Chemistry; Tribology, Corrosion and Coatings; Nanotechnology; Characterization and Evaluation of Materials;
• 出版者：Springer Berlin Heidelberg
• ISSN：2194-1289
• 卷排序：29

文摘

To improve the corrosion resistance and surface electrical conductivity of AISI 430 stainless steel (430 SS) as bipolar plates for proton exchange membrane fuel cells (PEMFCs) used in marine environment, a tungsten alloying layer has been successfully prepared on 430 SS substrate via the plasma surface diffusion alloying technique. The tungsten-modified (W-modified) 430 SS displays a 7–8 μm tungsten alloying layer with a body-centered-cubic structure. The W-modified surface also shows a better hydrophobicity with contact angle of 93.5° and a lower interfacial contact resistance compared with the untreated 430 SS. The potentiodynamic and potentiostatic polarization and electrochemical impedance spectroscopy measurements show that the corrosion resistance of 430 SS is obviously improved in simulated PEMFC environment (0.05 M H₂SO₄ + 2 ppm HF + 0.01 M NaCl solution at 70 °C), after the plasma surface diffusion alloying process.