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研究了Ni在氨-碳酸铵溶液中有氧存在下的溶解动力学. 结果表明Ni的溶解过程主要是电化学溶解过程,但尚有Ni的氧化伴生.反应速度为氨控制区或氧控制区,这与氨和氧的浓度之比有关. 在NH_3控制区Ni表面易钝化生成氧化膜,并停止溶解;在氧控制区,Ni的溶解速度为氧在液膜中的扩散所控制,可由氧传递速度方程来表达.
The dissolution kinetics of Ni in the presence of oxygen in ammonia-ammonium carbonate solution was investigated. The results show that the dissolution process of Ni is mainly electrochemical dissolution process, but there is oxidation associated with Ni. The reaction rate is ammonia control zone or oxygen control zone , Which is related to the concentration of ammonia and oxygen in the NH 3 control surface Ni passivation easy to generate oxide film, and to stop the dissolution; in the oxygen control zone, the dissolution rate of Ni diffusion of oxygen in the liquid film controlled by Oxygen transmission rate equation to express.