On the nature of the ‘induction period’ during the electrowinning of zinc from nickel containing sulphate electrolytes

Autor: Wiart, R., Cachet, C., Bozhkov, Chr, Rashkov, St.
Zdroj: Journal of Applied Electrochemistry; May 1990, Vol. 20 Issue: 3 p381-389, 9p
Abstrakt: As a result of detailed voltammetric, impedance, electron microscopic and opticalin situ investigations of the peculiarities encountered in zinc electrowinning from nickel-containing acid electrolytes, a model for the ‘induction period’ is proposed and its dependence on the process conditions is elucidated. The model is based on the screening effect of hydrogen bubbles formed on the nickel-rich regions of the cathode which give rise to local galvanic cells.
Databáze: Supplemental Index
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