Abstract
The active region of the dissolution of zinc in flowing KOH electrolyte has been examined as a function of composition, flow rate and current density. The onset of the active/passive transition has been studied as a function of these variables, together with the effect of additions of silicate ions. It is shown that in certain circumstances solution concentrations can be adjusted so that the active dissolution of zinc is extended indefinitely. An explanation for this behaviour is proposed in terms of the increased solubility of Zn(II) species within a silicate-rich layer immediately adjacent to the electrode. The presence of such a layer is supported by galvanostatic pulse experiments. Possible applications of this unusual phenomenon are outlined.
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