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Kinetics of Pb and Pb-Ag anodes for zinc electrowinning—II. Oxygen evolution at high polarization

✍ Scribed by C. Cachet; C. Rerolle; R. Wiart

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
886 KB
Volume
41
Category
Article
ISSN
0013-4686

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✦ Synopsis

Electrochemical impedance spectroscopy, scanning electron microscopy, X-ray diffraction and secondary ionisation mass spectroscopy (SIMS) have been utilized to investigate the mechanism of reactions taking place on Pb and PbAg alloy anodes in acidic zinc sulphate electrolytes, in the potential domain above 1.16 V sse. At these polarizations, the main reaction is oxygen evolution on a porous deposit of PbO,, or PbO, + MnO, in Mn2+ -containing electrolytes. In all cases, the electrode impedance reveals a slow electrode activation with increasing polarization, probably related to the deposit conductivity.

With lead-silver anodes it also appears an inhibition process of the main reaction, which becomes more important and turns into passivation, when the electrolyte contains Mn'+ ions. This process has been assigned to the formation of inhibiting adsorbates on the oxide layers.

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