L. Cifuentes, E. Astete
It is known that lead anodes used in the industrial extraction of copper by electrolysis (electrowinning) suffer corrosion due to current interruptions. This study aims to enhance understanding of the corrosion and protection mechanisms of lead anodes by analyzing the effects of various solute concentrations, including copper, sulphuric acid, cobalt, iron, manganese, chloride, and an organic additive (guar), on lead corrosion. The methodology employs weight loss tests and surface analysis techniques such as X-ray photoelectron spectroscopy, X-ray diffraction, and wavelength dispersive spectroscopy. Results indicate that the corrosion rate of lead during current interruptions increases with the concentration of sulphuric acid and copper, while cobalt, iron, and chloride reduce the corrosion rate. Notably, manganese does not decrease corrosion and precipitates on the lead anode surface under the tested conditions. A method for establishing the optimum anode protection current density during current interruptions is proposed, highlighting three ranges of current densities. The 'high' protection range corresponds to the increased compactness of the PbO2 layer at current densities exceeding 60 A m−2.
@article{b45069c8-ab81-4697-9a0c-201a76633ffe,
title={Corrosion and protection of lead anodes},
author={L. Cifuentes and E. Astete},
year={2026},
language={en}
}TY - JOUR TI - Corrosion and protection of lead anodes AU - L. Cifuentes AU - E. Astete PY - 2026 LA - en ER -
Unknown, Unknown
This chapter discusses metal casting processes, highlighting the diversity and common characteristics among them. The objective is to elucidate the fu
Unknown, Unknown
This study focuses on the fundamental characteristics of solid iron, which is predominantly composed of iron atoms and provides a basis for understand
Ir. Méshac KIME ILUNGA
Ce document traite des procédés métallurgiques spéciaux, en mettant particulièrement l'accent sur l'extraction liquide-liquide, un processus mis au po
Copper solvent extraction units at large hydrometallurgical plants face constraints in metal recovery, phase disengagement, and reagent consumption, d
Non spécifié
L'hydrométallurgie du cuivre, principalement axée sur les minerais oxydés facilement solubles, s'applique également aux minerais sulfurés ou mixtes ap