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Improving corrosion resistance of cu-al-based anodes in KF-alF_(3)-al_(2)O_(3)melts

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Transactions of Nonferrous Metals Society of China 2022年第1期32卷 354-363页

作者： Sai Krishna PADAMATA Andrey YASINSKIY aleksandr SHABANOV Timofey BERMESHEV You-jian YANG Zhao-wen WANG Dao CAO Peter POLYAKOV Laboratory of Physics and Chemistry of Metallurgical Processes and Materials Siberian Federal UniversityKrasnoyarskRussia Laboratory of Molecular Spectroscopy Krasnoyarsk Science Center SB RASKrasnoyarskRussia School of Metallurgy Northeastern UniversityShenyang 110819China

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 *** 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/*** 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 *** 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 *** was seen that pre-oxidised anodes possess a low corrosion rate compared to those without pre-oxidation treatment.

关键词： inert anodes potassium cryolite cu-al alloys corrosion aluminium electrolysis oxygen-evolving electrodes

Kinetic Equation for Internal Oxidation of cu-al alloy Spheres

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Journal of Wuhan University of Technology(Materials Science) 2007年第1期22卷 22-26页

作者：宋克兴 School of Materials Science and Engineering Henan University of Science and Technology Jiang Yin Xing Cheng Special Steel Works Co. LTD Jiangyin 214400 China

The kinetics of internal oxidation of cu-al alloy spheres, containing up to 2.214% mole fraction al was investigated in the temperature range 1 023 K to 1 273 K, and the depth of internal oxidation was measured in the microscopy. A kinetic equation was derived to describe the internal oxidation of cu-A1 alloy spheres, which was checked experimentally by means of oxidation depth measurements. The results show that the derived equation is exact enough to describe the kinetics of internal oxidation of cu-al alloy spheres. Based on this equation and the oxidation depth measurements, the permeability of oxygen in solid copper has been obtained. Investigation also shows that in the process of internal oxidation, there is no evidence for preferential diffusion along grain boundaries.

关键词： kinetic equation sphere cu-al alloys internal oxidation

Kinetics of Internal Oxidation of cu-al alloy Plate

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Journal of Wuhan University of Technology(Materials Science) 2005年第1期20卷 13-16页

作者：宋克兴 School of Materials Science and Engineering Xi'an Jiaotong UniversityXi'an 710049China School of Materials Science and Engineering Henan University of Science and T echnologyLuoyang 471003China

The kinetics of internal oxidation of dilut e cu-al alloys, containing up to 2.214% molar fraction al, was investigated over the temperature range of 1023K to 1273K, and the depth of internal oxidation was measured by microscopies. A modified rate equation was derived to describe the kinetics of internal oxidation of cu-al alloy *** on the derived equati on, the permeability of oxygen in solid copper was obtained from the internal ox idation measurements. The experimental results show that the depth of the intern al oxidation is a parabolic function of time, there is no evidence for preferent ial diffusion along grain boundaries and an outer layer of pure copper was forme d on the external surface of samples.

关键词： internal oxidation kinetics cu-al alloys dif fusion plate