The Anodic Behavior of Zinc in Potassium Hydroxide Solution

Abstract

A study of the anodic behavior of horizontal zinc electrodes in KOH solution has shown that the equation [formal omtited] holds for concentrations in the range 1–13.8M and passivation times in the range 10–800 sec. The constant k depends on the KOH concentrations and attains a maximum value in the region of 8.5M KOH; il, the maximum current density attainable without passivation, from a least squares fit is very near zero in all cases. From the linear parts of the curves connecting anode potential and time, values of dE/dT indicate that the conductivity of the anodic product prior to passivation depends on the concentration of the KOH electrolyte. This conductivity passes through a maximum in the same region as that which produces the longest passivation times. © 1963, The Electrochemical Society, Inc. All rights reserved.