纳米增韧Φ100 mm圆柱形NiFe2O4基惰性阳极的电解腐蚀行为研究
Study on Electrolytic Corrosion Behavior and Mechanism of Nano Toughened Φ100 mm Cylindrical NiFe2O4 Based Inert Anode

作者: 张志刚 , 徐建荣 , 罗洪杰 , 姚广春 :东北大学材料与冶金学院,辽宁 沈阳;

关键词: NiFe2O4惰性阳极电解腐蚀NiFe2O4 Inert Anode Electrolysis Corrosion

摘要:
采用粉末冶金两步烧结法制备纳米增韧Φ100 mm圆柱形NiFe2O4基惰性阳极,通过10 h电解实验研究其电解腐蚀行为与机理。研究结果表明纳米增韧Φ100 mm圆柱形NiFe2O4基惰性阳极高温稳定性好,金属导杆和惰性阳极通过固相烧结扩散连接具备足够的高温强度和导电性能,电解过程中槽电压保持相对稳定。电解10 h后阳极没有发生开裂、肿胀、表面起层等现象,表现出较好的抗热震性能和耐腐蚀性能;产品铝纯度为98.02%,其中杂质主要为Fe、Ni和Cu,耐腐蚀性能需要进一步提升。NiFe2O4纳米粉的添加能够有效地增强阳极材料的晶界结合强度和降低气孔率,降低电解质组成渗入阳极内部几率,从而有效提高NiFe2O4基惰性阳极的耐熔盐腐蚀能力。

Abstract: Nano toughened Φ100 mm cylindrical NiFe2O4 based inert anodes was prepared by powder me-tallurgy two-step sintering method. The electrolytic corrosion behavior and mechanism of NiFe2O4 based inert anodes were investigated by 10 h electrolysis experiment. The results show that the cell voltage keeps relatively stable, which is attributed to the good high temperature stability of nano toughened cylindrical NiFe2O4 based inert anode as well as the adequate high-temperature strength and conductivity of the solid state sintered connection between metal rod and inert anode. The electrolyzed inert anode has not undergone cracking or swelling, showing a suitable thermal shock resistance and corrosion resistance. The corrosion resistance should be enhanced for the purity of product aluminum was 98.02%, where the main impurities were Fe, Ni and Cu. The enhanced grain boundary bonding strength and decreased porosity, derived from the adding of NiFe2O4 nanopowder, can reduce the probability of electrolyte infiltration into the anode inside. As a result, the corrosion resistance of nano toughened NiFe2O4 based inert anodes has been improved effectively.

文章引用: 张志刚 , 徐建荣 , 罗洪杰 , 姚广春 (2015) 纳米增韧Φ100 mm圆柱形NiFe2O4基惰性阳极的电解腐蚀行为研究。 冶金工程, 2, 1-7. doi: 10.12677/MEng.2015.21001

参考文献

[1] Kvande, H. and Haupin, W. (2001) Inert anodes for Al smelters: Energy balances and environmental impact. JOM, 53, 29-33.

[2] Edwards, L., Richards, N. and Kvande, H. (2001) Inert anodes and other new Al technologies-benefits, challenges, and impact on present technology. JOM, 53, 48-50.

[3] Olsen, E. and Thonstad, J. (1999) Nickel ferrite as inert anodes in aluminum electrolysis: Part I material fabrication and preliminary testing. Journal of Applied Elec-trochemistry, 29, 293-299.

[4] Xi, J.H., Xie, Y.J., Yao, G.C. and Liu, Y.H. (2008) Effect of additive on corrosion re-sistance of NiFe2O4 ceramics as inert anodes. Transactions of Nonferrous Metals Society of China, 18, 356-360.

[5] Windsch, C.F., Strachan, D.M. and Henager, C.H. (1993) Materials characterization of cermet anodes tested in a pilot cell. In: Genesca, J., Ed., Light Metals—The Minerals, Metals and Materials Society, Denver, 445-453.

[6] Long, X.L., Liu, Y.H., Yao, G.C., Du, J.J., Zhang, X., Chen, J. and Hua, Z.S. (2013) Microstructure and mechanical properties of NiFe2O4 ceramics reinforced with ZrO2 particles with different sintering temperature. Journal of Alloys and Compounds, 551, 444-450.

[7] 张淑婷 (2006) 纤维增强NiFe2O4基阳极材料的制备及性能研究. 博士论文, 东北大学, 沈阳.

[8] Hua, Z.S., Yao, G.C., Ma, J.F. and Zhang, M.L. (2013) Fabrication and mechanical properties of short ZrO2 fiber reinforced NiFe2O4 matrix composites. Creamics International, 39, 3699-3708.

[9] Zhang, Z.G., Liu, Y.H., Yao, G.C., Wu, D. and Ma, J.F. (2012) Effect of nanopowder content on properties of NiFe2O4 matrix inert anode for aluminum electrolysis. In: Suarez, C.E., Ed., Light Metals—The Minerals, Metals and Materials Society, Orlando, 1381-1384.

[10] 席锦会 (2006) 两步烧结制备铝电解惰性阳极材料的研究. 博士论文, 东北大学, 沈阳.

[11] 邱竹贤 (1998) 铝电解原理与应用. 中国矿业大学出版社, 徐州.

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