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The presence of thiosulfate ions in ammoniacal–carbonate solutions containing copper(II) ions was found to prevent the passivation of iron, even though iron passivation is observed in solutions with no thiosulfate at very low copper(II) concentrations. The prolonged anodic dissolution of iron resulted in the formation of a partly crystalline sulfide layer on its surface, which based on Grazing Incidence...
The cathodic reactions which are involved in the dissolution of iron alloys in solutions typically used in the Caron Process have been investigated by electrochemical methods. The results have confirmed that cobalt(III) ammine complexes are the main oxidising agents but also highlight the important role of thiosulfate. A solid product is deposited on platinum as well as iron electrodes below −0.75V/SCE...
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