| 引用本文: | 周媛媛1a，崔用武1b，李锦春1a，孙元明2.La系储氢合金表面氟化处理技术[J].中国表面工程,2011,24(1):56~60 |
| ZHOU Yuan–yuan1a, CUI Yong–wu1b, LI Jin–chun1a, SUN Yuan–ming2.Surface Fluorination Treatment of Hydrogen Storage Alloys La[J].China Surface Engineering,2011,24(1):56~60 |
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| 摘要: |
| 通过分析不同HF/KF配比调制的溶液pH及F离子浓度，绘制了可用于对La系储氢合金进行表面处理的溶液组成参考图。通过ICP、EPMA、BET等分析手段对处理前后的合金进行观察和表征，得到氟化处理最佳条件并证明了氟化处理的反应机理包含除去氧化物反应、Ni离子溶出反应和在合金表面形成氟化物反应3个阶段。结合活化速度和电化学特性分析表明，通过氟化处理方法对储氢合金粒子进行表面化学处理，可达到去除合金表面氧化物膜，增加比表面积，保持合金的表面活性和延长合金的耐久性的目的。 |
| 关键词: 氟化处理 反应机理 比表面积 活化特性 |
| DOI： |
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| 基金项目:江苏省科技支撑计划-工业部分(BE2008040) |
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| Surface Fluorination Treatment of Hydrogen Storage Alloys La |
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ZHOU Yuan–yuan1a, CUI Yong–wu1b, LI Jin–chun1a, SUN Yuan–ming21,2,3
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1a.School of Materials Science and Technology;2.b.School of Chemistry and Chemistry Engineering, Changzhou University;3.2.High–tech Research Institute of Nanjing University, Changzhou
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| Abstract: |
| Different initial solution compositions of HF/KF were prepared in this paper, and the solution can be used to the surface treatment of hydrogen storage alloys. According to the investigation on the pH value of solution and the concentration of fluorion, we draw a diagram concerning the composition of the fluorination solution. The pre–and post–treatment alloy were analyzed and characterized by ICP, EPMA and BET, and then offered optimum conditions and illustrated reaction mechanism. The fluorination included three stages: oxide film removed from alloy surface, Ni ion released and fluoride formatted on the surface of alloys. And based on the investigation of activatory speed and electrochemical performance, it may safely draw the conclusions that oxide film removed from alloy surface, specific surface area increased, high surface activity keeping and durability were improved. |
| Key words: fluorination reaction mechanism specific surface area activation property |
