标题：Electrochemical preparation of NiAl intermetallic compound from solid oxides in molten CaCl2 and its corrosion behaviors in NaCl aqueous solution
作者：Yin, HY(Yin, Huayi);Yu, T(Yu, Tang);Tang, DY(Tang, Diyong);Ruan, XF(Ruan, Xuefeng);Zhu, H(Zhu, Hua);Wang, DH(Wang, Dihua)
来源出版物：MATERIALS CHEMISTRY AND PHYSICS 卷：133 期：1 页：465-470 出版年：MAR 15 2012
摘要：Nickel aluminide powders were prepared by direct electrochemical reduction of solid mixture of NiO-NiAl2O4 (Ni:Al = 1:1 in mol) precursor in molten CaCl2 at 850 degrees C. The reduction process of the solid oxide cathode was investigated by analyzing the intermediate products using X-ray diffraction (XRD) and scanning electron microscopy (SEM). It reveals that nickel is preferentially reduced and it benefits to prevent aluminum leaving from the cathode. The products obtained at the constant cell voltage electrolysis of 3.0 V for more than 4 h were stoichiometric NiAl. The energy consumption could be as low as 6.1 kWh (kg-NiAl)(-1) based on the applied cell voltage and the consumed electrolysis charge. Furthermore, the NiAl powders were made into a dense rod by spark plasma sintering (SPS) technique. The corrosion behaviors of the NiAl rod in 0.5 mol L-1 NaCl aqueous solution at room temperature were investigated by polarization curve and ac impedance measurements. It was found that the NiAl rod had satisfactory anti-corrosion ability in the solution. (C) 2012 Elsevier BM. All rights reserved.
作者关键词：Corrosion test; Nickel aluminide; Electrochemical reduction; Molten salt
扩展关键词：ELECTROLYTIC REDUCTION; 3-PHASE INTERLINES; CALCIUM-CHLORIDE; INSULATOR COMPOUNDS; HYDROGEN-PRODUCTION; ALLOY; DECOMPOSITION; METHANE; MO; AL
通讯作者地址：Wang, DH (通讯作者),Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China
[Yin, Huayi]Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China
[Yu, Tang] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China
[Tang, Diyong] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China
[Ruan, Xuefeng] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China
[Zhu, Hua] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China
[Wang, Dihua] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China;Chinese Acad Sci, State Key Lab Corros & Protect, Inst Met Res, Shenyang 110016, Peoples R China
|
|
