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Contribution à l'étude de la cinétique de l'oxydation anodique de l'anhydride sulfureux dissous dans les conditions de l'extraction électrolytique du cuivre

par González Maldonado, Joselin ;Boute, Carmen ;Decroly, Claude
Référence Electrochimica acta, 10, 5, page (513-527)
Publication Publié, 1965-05

Article révisé par les pairs

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Résumé :

The anodic oxidation of sulphur dioxide dissolved either in distilled water or in acid solutions of copper sulphate has been studied, on account of the notable lowering of anodic polarization that this reaction can lead to in the extraction electrolysis of copper. The behaviour of different isolated electrodes in presence of SO 2 (passivated lead, graphite, stainless steel, cobalt-chrome-iron alloy UMCO 50, platinum) was studied, and the anodic polarization curves have been established by intensiodynamic, potentiodynamic and intensiostatic methods. The mechanism of anodic oxidation of sulphur dioxide on polished platinum was suggested by the existence of a transition time linked both to the depolarizer diffusion phenomena, and by the modification of the electrode surface at different polarizations. Contrary to passivated lead, stainless steel makes possible, like platinum, the oxidation of sulphur dioxide, the reaction being similarly inhibited at high polarizations. The importance of modifications of the state of surface is made clear through the effects observed in presence of chloride ion. © 1965.