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The Effect of Direct and Variable Current on Current Efficiency of Copper Anode  

Ahan, Sung-Chen (LS-Nikko Copper Inc.)
Lee, Sang-Mun (LS-Nikko Copper Inc.)
Kim, Yong-Hwan (Dept. Metallurgical Engineering, Pusan National University)
Chung, Won-Sub (Dept. Metallurgical Engineering, Pusan National University)
Publication Information
Journal of the Korean institute of surface engineering / v.39, no.5, 2006 , pp. 223-228 More about this Journal
Abstract
The current efficiency of copper anode containing impurities in copper sulfate solution for electrorefining was studied at various current type such as direct current, variable current and periodic reverse current. The passivity behavior was investigated by galvanostatic technique. The results obtained were that current efficiency of variable current was higher than those of direct current and periodic reverse current. The increased current efficiency could be explained by the formation of slime structure with lower average resistance due to variable current. The frequency of various factors in variable current condition has a greatest effect on current efficiency. It appeared that frequency increased current efficiency when increased from 1 to 4, but further increases did not have an effect.
Keywords
Variable current; Direct current; Current efficiency;
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