Improving corrosion resistance of Cu-Al-based anodes in KF-AlF_(3)-Al_(2)O_(3)melts  

提高KF-AlF_(3)-Al_(2)O_(3)熔体中Cu-Al基阳极的耐腐蚀性

作　　者：Sai Krishna PADAMATA Andrey YASINSKIY Aleksandr SHABANOV Timofey BERMESHEV You-jian YANG Zhao-wen WANG Dao CAO Peter POLYAKOV Sai Krishna PADAMATA;Andrey YASINSKIY;Aleksandr SHABANOV;Timofey BERMESHEV;杨酉坚;王兆文;曹导;Peter POLYAKOV(Laboratory of Physics and Chemistry of Metallurgical Processes and Materials,Siberian Federal University,Krasnoyarsk,Russia;Laboratory of Molecular Spectroscopy,Krasnoyarsk Science Center SB RAS,Krasnoyarsk,Russia;东北大学冶金学院,沈阳110819)

机构地区：[1]Laboratory of Physics and Chemistry of Metallurgical Processes and Materials,Siberian Federal University,Krasnoyarsk,Russia [2]Laboratory of Molecular Spectroscopy,Krasnoyarsk Science Center SB RAS,Krasnoyarsk,Russia [3]School of Metallurgy,Northeastern University,Shenyang 110819,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第1期354-363,共10页中国有色金属学报（英文版）

摘　　要：The anodic behaviour of pre-oxidised and non-oxidised Cu-Al-based anodes(Cu-10Al and Cu-9.8Al-2Mn)in KF-AlF_(3)-Al_(2)O_(3)melts was studied through galvanostatic and potentiodynamic polarization techniques.The alloy compositions were oxidised for a short-term(8 h)at 700℃,followed by galvanostatic polarization for 1 h at 800℃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/AlF_(3)).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.采用恒电流和动电位极化技术研究经预氧化的和未经预氧化的Cu-Al基阳极(Cu-10Al和Cu-9.8Al-2Mn)在KF-AlF_(3)-Al_(2)O_(3)熔体中的阳极行为。将合金在700℃下进行短时间(8 h)氧化,然后在800℃下施以0.4 A/cm^(2)的电流密度进行1 h恒电流极化。测定扫描速率为0.01 V/s的动电位曲线。对在阳极表面冻结的熔体样品进行XRD分析,并在实验后对阳极进行SEM分析,以研究合金表面形成的氧化皮的物相。所有阳极材料的稳态电位都在2.30~2.50 V(vs Al/AlF_(3))范围内。根据动电位极化获得的数据计算阳极的腐蚀速率。结果表明,经预氧化的阳极比未经预氧化的阳极具有更低的腐蚀速率。

关 键 词：inert anodes potassium cryolite Cu-Al alloys corrosion aluminium electrolysis oxygen-evolving electrodes 

分 类 号：TG172[金属学及工艺—金属表面处理]