Electrochemical Properties of Tungsten-Alloying-Modified AISI 430 Stainless Steel as Bipolar Plates for PEMFCs used in Marine Environment
来源期刊：Acta Metallurgica Sinica2016年第10期
论文作者：Jin-Long Cui Zhen-Dong Yao Yong-Fu Cui Fu-Peng Cheng Ting Xiao Hong-Liang Sun Ru-Jin Tian Jun-Cai Sun
文章页码：920 - 927
摘 要：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 tungstenmodified（W-modified） 430 SS displays a 7–8μm 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 ℃）, after the plasma surface diffusion alloying process.
Jin-Long Cui1，Zhen-Dong Yao1，Yong-Fu Cui1，Fu-Peng Cheng1，Ting Xiao1，Hong-Liang Sun1，Ru-Jin Tian2，Jun-Cai Sun1
1. Institute of Materials and Technology, Dalian Maritime University2. College of Materials Science and Engineering, Dalian Jiaotong University
摘 要：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 tungstenmodified（W-modified） 430 SS displays a 7–8μm 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 ℃）, after the plasma surface diffusion alloying process.
关键词：
