Articulo
A lead-acid battery analogue to in situ anode degradation in copper electrometallurgy
CORROSION SCIENCE;
Corrosion Sci.
Registro en:
0
D97I2035
D97I2035
WOS:000074180000007
0010-938X
Autor
CIFUENTES-MOLINA, GERARDO
CIFUENTES, L .
CRISOSTOMO, G.
Institución
Resumen
When the applied current is interrupted in a copper electrowinning plant, lead anodes tend to corrode once the plant is back in operation. This work aims to show, both from theoretical considerations and experimental evidence, that this phenomenon may arise From the spontaneous coupling of the oxidation of metallic lead to lead (II) sulfate with the reduction of lead (IV) dioxide to lead (II) sulfate on the unenergized anodes. The process is similar to the one that takes place in an idle lead-acid battery. It is shown that, in the above conditions, the protective oxide layer on the anode takes between 5 and IO min to dissolve. Estimates are given for the rate of lead (IV) dioxide dissolution and lead sulfate Formation and conclusions are drawn for plant practice. (C) 1998 Elsevier Science Ltd. All rights reserved. 0 11 FONDEF 0 0 3 FONDEF 40