(1. 河北工業(yè)大學(xué) 材料學(xué)院，天津 300130；
2. 河北理工大學(xué) 材料學(xué)院，唐山 063009；
3. 河北理工大學(xué) 化工與生物技術(shù)學(xué)院，唐山 063009)
摘 要: 在850 ℃的CaCl2熔鹽中，以燒結(jié)后的Co3O4-SnO2片體為陰極，高純石墨棒為陽極，采用恒電壓電解，制備CoSn合金，研究燒結(jié)溫度、電解時間對電解過程的影響。采用電子掃描顯微鏡(SEM)和X射線衍射儀(XRD)分析樣品的微觀形貌和電解產(chǎn)物的相組成，并采用循環(huán)伏安法研究其反應(yīng)機理。結(jié)果表明：經(jīng)850 ℃燒結(jié)的混合氧化物試樣，在2.1 V工作電壓下電解12 h，可制備出海綿狀純相的CoSn合金。在電脫氧過程中，單質(zhì)Co首先分步還原，錫的氧化物與熔鹽反應(yīng)后在單質(zhì)Co表面還原，形成CoSn合金。
關(guān)鍵字: 電脫氧；CoSn；氧化物；熔鹽
（1. College of Materials, Hebei University of Technology, Tianjin 300130, China;
2. College of Materials, Hebei Polytechnic University, Tangshan 063009, China;
3. College of Chemical Engineering and Biotechnology, Hebei Polytechnic University, Tangshan 063009, China）
Abstract:The CoSn alloy was prepared in molten CaCl2 at 850 ℃ by constant voltage (2.1 V) electrolysis using sintered pellet of SnO2 and Co3O4 mixture as cathode and pure graphite rod as anode. The effects of the sintering temperature and electrolysis time on the electro-deoxidization process were studied. The morphologies and phases composition of products of the electro-deoxidization were examined by SEM and XRD, respectively. The mechanism of the electro-deoxidization process was studied by cyclic voltammetry. The results show that that pure spongy CoSn can be prepared by direct electrochemical electrolysis of Co3O4/SnO2 mixture pellets sintered at 850 ℃ in molten CaCl2 at 2.1 V for 12 h. During the electro-deoxidization process, in the mixed oxide, Co3O4 is realuced to Co step by step, followed by the reaction of Sn oxide with molten on the surface of the newly-formed Co to form CoSn alloy.
Key words: electro-deoxidization; CoSn; oxide; molten salt
