(江西理工大學(xué)冶金與化學(xué)工程學(xué)院，贛州 341000)
摘 要: 以Na3AlF6-AlF3-MgF2-LiF為電解質(zhì)，Al2O3、Nd2O3為原料，對(duì)熔鹽電解制備Al-Nd中間合金進(jìn)行研究；采用掃描電子顯微鏡(SEM)、能譜(EDS)分析合金產(chǎn)物的形貌及組成；通過還原實(shí)驗(yàn)和循環(huán)伏安法，對(duì)Nd(Ⅲ)離子在Na3AlF6-AlF3-MgF2-LiF體系中的還原過程進(jìn)行表征。結(jié)果表明：在溫度935 ℃、恒壓3.2 V條件下，通過Na3AlF6-AlF3-MgF2-LiF-(Al2O3、Nd2O3)體系可電解得到Al-Nd中間合金，富釹相集中分布在鋁基體晶界區(qū)域，Nd(Ⅲ)離子主要通過鋁熱還原形式進(jìn)入合金相，且Nd2O3的加入可起到去極化作用，使Al(Ⅲ)離子擴(kuò)散系數(shù)大幅提高。
關(guān)鍵字: 熔鹽電解；Al-Nd中間合金；循環(huán)伏安法；去極化作用；擴(kuò)散系數(shù)
（School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology,
Ganzhou 341000, China）
Abstract:Preparation of Al-Nd intermediate alloy was studied in the system using Na3AlF6-AlF3-MgF2-LiF as electrolyte and Al2O3, Nd2O3 as raw materials. The morphology and composition were analyzed by scanning electron microscope (SEM) and energy spectrum (EDS). The reduction process of Nd(Ⅲ) ion in Na3AlF6-AlF3-MgF2-LiF system was characterized by reduction experiment and cyclic voltammetry. The results show that Al-Nd intermediate alloy can be obtained by electrowinning in Na3AlF6-AlF3-MgF2-LiF-(Al2O3, Nd2O3) system at the temperature of 935 ℃ and constant voltage of 3.2 V. Neodymium-rich phase of alloy samples distributes in the region of aluminum grain boundary. The form of Nd doping into the alloy phase is mainly used by aluminothermic reduction. The effect of Nd2O3 is depolarization and makes the Al (Ⅲ) ion diffusion coefficient increase significantly.
Key words: molten salt electrolysis; Al-Nd intermediate alloy; cyclic voltammetry; depolarization effect; diffusion coefficient
