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Al-In-Mg系铝合金阳极在NaOH溶液中的电化学行为 总被引:6,自引:0,他引:6
以Al-In-Mg合金为基础,选择添加Pb、Mn、sn制备了4类铝合金阳极材料。通过自腐蚀、开路电位、阳极极化方式研究了该系列合金阳极在c(NaOH)=4mol/L溶液中的电化学腐蚀行为,初步分析了合金成分、介质温度及溶液缓蚀剂对合金阳极性能的影响。结果发现:制备的3#(Al-In-Mg-Sn)合金、4#(Al-In-Mg-Sn-Pb)合金阳极在c(NaOH)=4mol/L c(Na2SnO3)=0.04mol/L溶液中表现出更好的电化学性能,具有比纯铝(99.95%)更负的开路电位,更小的自腐蚀速率和更低的阳极极化。 相似文献
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针对电解铝生产中出现的含镁电解质体系性质进行了探讨。对生产中出现的操作问题,系统的分析了原因,并结合生产实际找出了应对措施。 相似文献
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1 IntroductionSince the Hall-Heroult process was applied in aluminium production,an inert anode was al ways thetarget that the aluminiumindustry is seeking for in the newtechnology field. The greenhouse gases CO2and the fluoride CFnemittedfromthe present carbon anodes ,give a huge pressure onthe environment .Theapplication of inert anodes will help us go through this trouble :a cell with inert anodes emits oxygen in-stead of CO2and other nocuous gases ;the newtype of cell with inert anodes … 相似文献
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电解铝工业中铝的析出发生在阴极上,研究铝析出反应的机理对实际工况有很好的指导意义。研究发现,炭电极上的Al、Na共沉积现象严重,致使循环伏安曲线上Al的析出峰被掩盖。因此人们试图用一些金属电极Ni、Pt、Au、Ta、Cu、W等来代替炭电极,但研究发现大部分金属电极都与Al反应生成合金,干扰了对真实电极过程的研究。只有W与Al的合金化作用较小,因此对冰晶石一氧化铝熔体的阴极电化学研究采用了W电极。而目前TiH2基可湿润阴极是极具发展前景的铝电解槽阴极材料,但这方面的研究还很不够,需做进一步的研究。 相似文献
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铝电解阳极气泡行为对研究电解质流场模拟和阳极效应都至关重要.本文采用高温透明电解槽观测了底面积为50 cm2(10 cm×5 cm)的石墨阳极上的气泡行为,实验温度为924℃.结果表明:在阳极电流密度为0.3~1.7A/cm2范围内,最大气体覆盖率在48%~65%之间,与工业电解槽炭阳极上的最大气体覆盖率相近,低于文献... 相似文献
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NdF3-LiF melts are commonly used in the electrolysis process of metallic neodymium production. Research on the density and ionic structure of the electrolyte is important for its close connection with the electrolysis mechanism and process. In this paper, the density of LiF-NdF3 melts was studied by the Archimedes method. The results showed that the density decreased with increasing temperature and LiF contents. The changing law was discussed and explained in terms of the micro ionic structure of the melts.... 相似文献
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Electrical conductivity of NaF-AlF3 melts was measured by continuously varying cell constant(CVCC) technique. Relationships between equivalent conductivity at 990-1 030 ℃ and temperature and composition, and relationship between equivalent conductivity activation energy and composition of the melts were then studied on the basis of two-step decomposition mechanism of AlF63-. According to the changes of molar fractions of different anions in NaF-AlF3 melts, courses of dependence of equivalent conductivity and its activation energy on composition were analyzed. The results show that the influence of temperature on equivalent conductivity of the melts is small in the researched temperature range, and equivalent conductivity increases with increasing the molar fraction of AlF3; there is a minimum point in the activation energy-composition curve when molar fraction of AlF3 is 0.29. 相似文献
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Nd-F species in NdF3-LiF melts were studied using cryoscopic method.Liquidus temperatures of melts of various compositions were determined by differential thermal analysis(DTA).Based on the different model calculations,NdF4- was identified as the most likely Nd-F entity in the melts in which the mole fraction of NdF3 was lower than 20%,considering only one single Nd species in the melt,and which was formed in accordance with Temkin model or Flood model.Then,activities of different components in the melts were researched.The results show that activity of LiF decreases,and that of NdF3 increases with increasing the mole fraction of NdF3.The value of activity coefficient of NdF3 is higher than 1,and that of LiF is lower than 1. 相似文献