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Anodic polarization curves were determined on smooth Pt, Pt-coated Ti, PbO2-coated graphite, and PbO2-coated Ti. Operating conditions were typical for industrial perchlorate production, i.e. 1.6 moles/liter NaC104, while NaC10~ concentration was ranging between 0.47 and 4.7 moles/liter, at 50~ p.H 6-7. For solutions containing NaC104 only, the anodic current potential alagram is rectilinear, irrespective of any presence of NaF or Na2Cr2OT. If NaC103 also is present, the diagram shows a strong inflection. For each set of conditions, current efficiency and anode potential were determined vs. current density. This allowed two separate curves for C10~-conversion rate and O2 evolution rate, respectively, to be plotted vs. anode potential. Tafel linearity for C103-conversion is thus obtained on Pt and on PbO2 under all conditions, with a slope ranging between 0.1 and 0.12. This fact supports the view that C103-is oxidized through a path involving primary discharge of C10~with formation of CIO3 radicals and that charge transfer is in most cases the rate-determining step.The over-all reaction of anodic chlorate oxidation is

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