Effects of Pd substitution for Ni on corrosion performances of Mg_(0.9)Ti_(0.1)Ni_(1-x)Pd_x hydrogen storage alloys |
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作者单位: | Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China Graduate School of Chinese Academy of Sciences Beijing 100049 China,Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China Graduate School of Chinese Academy of Sciences Beijing 100049 China,Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China Graduate School of Chinese Academy of Sciences Beijing 100049 China,Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China Graduate School of Chinese Academy of Sciences Beijing 100049 China,Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China Graduate School of Chinese Academy of Sciences Beijing 100049 China,Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China Graduate School of Chinese Academy of Sciences Beijing 100049 China,Institute of New Energy Material Chemistr y Nankai University Tianjin 300071 China |
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基金项目: | 国家高技术研究发展计划(863计划) |
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摘 要: | 1 Introduction MgNi-based amorphous hydrogen storage alloys have drawn much attention in the last ten years. Compared with AB5 or AB2 type electrode alloys, the alloy candidates for the negative electrode of Ni-MH batteries possess several advantages, su…
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Effects of Pd substitution for Ni on corrosion performances of Mg0.9Ti0.1Ni1-xPdx hydrogen storage alloys |
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Authors: | TIAN Qi-feng ZHANG Yao TAN Zhi-cheng XU Fen SUN Li-xian ZHANG Tao Yuan Hua-tang |
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Abstract: | The Mg0.9Ti0.1Ni1?xPdx (x= 0, 0.05, 0.1, 0.15) hydrogen storage electrode alloys were prepared by mechanical alloying. The main phases of the alloys were determined as amorphous by X-ray diffraction(XRD). The corrosion potentials of the alloys were measured by open circuit potential measurements and the values are ?0.478, ?0.473, ?0.473 and ?0.471 V (vs Hg/HgO electrode) for x=0, 0.05, 0.1, 0.15, respectively. The corrosion currents of the studied alloys were obtained by non-linear fitting of the anodic polarization curve using Bulter-Volmer equation and Levenberg-Marquardt algorithm, which were obtained after different cycles. The initial corrosion currents of the alloys are decreased with the increasing of Pd content. The increasing of Pd content in the alloys inhibits the corrosion rates of the electrode alloys with the progress of cycle number. The electrochemical impedance spectroscopy(EIS) was conducted after open circuit potential of the alloys stabilizing. The impedance data fit well with the theoretical values obtained by the proposed equivalent circuit model. The corrosion resistances and the thickness of surface passive film of the alloys, which were deduced by the analyses of EIS, are enhanced with the increasing of Pd content in the alloys, which are consistent with the results of corrosion rates obtained from anodic polarization measurements. |
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Keywords: | MgNi-based alloys Pd mechanical alloying hydrogen storage alloy substitution corrosion resistance |
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