Improving corrosion resistance of Cu-Al-based anodes in KF-AlF3-Al2O3 melts

被引：7

作者：

Padamata, Sai Krishna ^{[1
]}

Yasinskiy, Andrey ^{[1
]}

Shabanov, Aleksandr ^{[2
]}

Bermeshev, Timofey ^{[1
]}

Yang, You-jian ^{[3
]}

Wang, Zhao-wen ^{[3
]}

Cao, Dao ^{[3
]}

Polyakov, Peter ^{[1
]}

机构：

[1] Siberian Fed Univ, Lab Phys & Chem Met Proc & Mat, Krasnoyarsk, Russia

[2] Krasnoyarsk Sci Ctr SB RAS, Lab Mol Spect, Krasnoyarsk, Russia

[3] Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2022年 / 32卷 / 01期

关键词：

inert anodes; potassium cryolite; Cu-Al alloys; corrosion; aluminium electrolysis; oxygen-evolving electrodes; NI-FE; ALUMINUM ELECTROLYSIS; INERT ANODES; NICKEL FERRITE; BEHAVIOR; OXIDATION; ALLOY;

D O I：

10.1016/S1003-6326(22)65800-X

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The anodic behaviour of pre-oxidised and non-oxidised Cu-Al-based anodes (Cu-10Al and Cu-9.8Al-2Mn) in KF-AlF3-Al2O3 melts was studied through galvanostatic and potentiodynamic polarization techniques. The alloy compositions were oxidised for a short-term (8 h) at 700 degrees C, followed by galvanostatic polarization for 1 h at 800 degrees C with an applied current density of 0.4 A/cm(2). The potentiodynamic curves were recorded with a sweep rate of 0.01 V/s. XRD analysis was conducted on frozen melt samples collected on the surface of the anode, and SEM observation was performed on the anode after the experiment to study the phases of the scales formed on the alloys. All the anode materials had a steady potential between 2.30 and 2.50 V (vs Al/AlF3). The corrosion rates of the anodes were calculated from the data acquired through potentiodynamic polarization. It was seen that pre-oxidised anodes possess a low corrosion rate compared to those without pre-oxidation treatment.

引用

页码：354 / 363

页数：10

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