引用本文:肇博涛， 叶一鸣， 刘丽飞， 胡石林， 张平柱.烷基功能化镀钯对LaNi4.25Al0.75储氢合金抗毒化性能的影响[J].中国表面工程,2016,29(2):24~29
ZHAO Botao, YE Yiming, LIU Lifei, HU Shilin, ZHANG Pingzhu.Influences of Electroless Palladium Plating with Pretreatment of Alkylation on Anti-poisoning of LaNi4.25Al0.75 Alloy[J].China Surface Engineering,2016,29(2):24~29
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烷基功能化镀钯对LaNi4.25Al0.75储氢合金抗毒化性能的影响
肇博涛， 叶一鸣， 刘丽飞， 胡石林， 张平柱
中国原子能科学研究院 特种材料工程部
摘要:
氢气中存在氧、氮等杂质气组分时，AB5型LaNi4.25Al0.75合金的吸氢速率和储氢容量将出现下降。为提高合金的毒化抗性，在化学镀钯工艺中引进烷基功能化的前处理技术对合金表面进行复合镀覆处理。通过扫描电子显微镜（SEM）、X射线衍射仪（XRD）对合金颗粒表面形貌和结构进行表征；通过容量法测试合金的储氢性能。扫描电镜下，相比纯化学镀样品表面Pd颗粒的球形形貌，复合镀覆γPdLaNi4.25Al0.75样品表面Pd颗粒为立方体型。测试结果表明，在O2和N2均为0.1%的氢气中，初始压力0.71 MPa、恒温30 ℃条件下，1%γPdLaNi4.25Al0.75样品的特征吸氢速率k和储氢容量Xmax（质量分数）分别达到0.065 s1和1.152%，较LaNi4.25Al0.75分别提高75.7%和9.2%，较PdLaNi4.25Al0.75分别提高30%和3.2%。表明以烷基功能化为前处理的复合镀覆法，能够进一步提升合金表面钯膜对H2分子的催化裂解活性，解决了镀Pd质量分数对催化活性提升的瓶颈，显著提高了LaNi4.25Al0.75合金的抗毒化性能。
关键词:  AB5型合金  化学镀  烷基化  钯
DOI：10.11933/j.issn.1007-9289.2016.02.004
分类号:
基金项目:
Influences of Electroless Palladium Plating with Pretreatment of Alkylation on Anti-poisoning of LaNi4.25Al0.75 Alloy
ZHAO Botao, YE Yiming, LIU Lifei, HU Shilin, ZHANG Pingzhu
Engineering Department of Special Material, China Institute of Atomic Energy
Abstract:
When running into air impurities such as O2 and N2 in hydrogen, the dynamic performance and hydrogen capacity of the AB5type LaNi4.25Al0.75 alloy significantly decrease. The pretreatment of alkylation based on electroless palladium plating was introduced to enhance the resistance against poisoning of compound alloy. Surface morphologies and structure of the LaNi4.25Al0.75 alloy were characterized by SEM and XRD, and the hydrogen absorption properties were tested by the volumetric method. The palladium particles made by the pretreatment formed nanocubes instead of nanospheres by scanning electron microscope. Characteristics absorption rate k and hydrogen capacity Xmax(mass fraction) of 1%γPdLaNi4.25Al0.75 alloy are 0.065 s1 and 1.152% in impure hydrogen, containing both O2 and N2 of 0.1% under an initial pressure of 0.71 MPa at 30 ℃, which is remarkably raised by 75.7% and 9.2% than that of the LaNi4.25Al0.75 alloy; raised by 30% and 3.2% than that of the PdLaNi4.25Al0.75 alloy, respectively. It’s proved the antipoisoning of LaNi4.25Al0.75 alloy is further enhanced by electroless palladium plating with pretreatment of alkylation, because of the catalytic activity improvement of palladium film, breaking the limitation from palladium content.
Key words:  AB5type alloy  electroless plating  alkylation  palladium
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