The presence of elemental sulfur caused pronounced changes in the passivation of iron. In higher alkali solutions, soluble divalent iron sulfur complexes are formed involving S22– ions. The trivalent oxides dissolve forming trivalent iron sulfur complexes, which cause complete passivation on further polarization of the surface by forming the polysulfide film. The reduction of the oxide film is found to involve sulfide ions. FeOOH reduction to soluble divalent iron is enhanced by the presence of sulfur.

Subject
Sulfur, Ions, Metal surfaces, Iron sulfides, Oxide films, Iron, Solubility, Ion concentrations, Polysulfides, Passivation, Risk reduction, Electrodes, Oxidation
Keywords:
alkali solutions, cyclic voltammetry, iron-sulfur complexes
NACE International
1992
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