硫酸甲醇体系中钽的电解动力学
Electrolysis kinetics of tantalum in sulfuric acid-methanol solution
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摘要: 为了探索钽的电解动力学行为，在硫酸甲醇电解液中对钽进行了电解抛光的实验研究，测定了电解液配比、电压、搅拌速率对钽薄膜减薄速率的影响；通过测定温度对反应速率的影响，计算了阿仑尼乌斯（S.A.Arrhenius）活化能。研究结果表明：温度在0 ℃，硫酸甲醇体积比为1∶7时，钽的电解行为符合典型金属极化行为规律；在电压10~20 V的范围内，搅拌速率大于8 m/s时，减薄速率稳定为11.45 μm/min；当搅拌速率小于8 m/s时，扩散传质控制电解过程，当大于8 m/s后，电解过程为非扩散控制。温度对反应速率的影响表明,钽在硫酸甲醇电解液中的电解行为符合S.A.Arrhenius公式，活化能为15.77 kJ·mol-1。Abstract: In order to explore kinetic behaviors of electrolysis of tantalum, the electrolytic polishing of tantalum in sulfuric acid-methanol solution was experimentally studied. The influence of electrolyte composition, cell potential and stirring speed on the thinning speed of tantalum was investigated. And the S.A.Arrhenius activation energy was calculated via altering the reaction temperature. The results show that the polarized behavior of tantalum is consistent with general metal polarization when the volume ratio of sulfuric acid to methanol is 1∶7. For voltage from 10 to 20 V, the thinning speed is around the steady value of 11.45 μm/min when the stirring speed is more than 8 m/s. When the stirring speed is less than 8 m/s, the electrolysis process is controlled by the rate of diffusion, w
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Key words:
- tantalum /
- electrolysis kinetics /
- thinning speed /
- activation energy
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