Abstract
The development of iron oxide films on pyrite has been investigated using linear potential sweep voltammetry. Voltammograms for a fresh pyrite surface indicated the presence of an iron(II) hydroxyoxide. After brief exposure to air, the surface layer oxidized to iron(III) hydroxy-oxide. Immersion in iron(II) solutions containing small amounts of iron(III) resulted in an increase in the thickness of the oxide layer to a limiting value; the oxide was present mainly in the iron(III) state. An iron hydroxy-oxide also developed on gold during immersion in iron(II) solution. A pyrite surface abraded on iron powder in deoxygenated water also became coated with iron hydroxy-oxide. Immersion of pyrite in cyanide solution resulted in a decrease in the quantity of oxide on the surface.
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Ramprakash, Y., Koch, D.F.A. & Woods, R. The interaction of iron species with pyrite surfaces. J Appl Electrochem 21, 531–536 (1991). https://doi.org/10.1007/BF01018606
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DOI: https://doi.org/10.1007/BF01018606