## Al&met-Potentiodynamic experiments in the range 600-06 mV/s, designed to elucidate the processes by which the zinc electrode in alkali becomes passive, are described. At low overpotentials the dissolution process is a complex solution mechanism in which soluble zincate species leave the electro
The anodic behaviour of zinc in aqueous KOH solution—I. Passivation experiments at very high current densities
✍ Scribed by T.P. Dirkse; N.A. Hampson
- Publisher
- Elsevier Science
- Year
- 1971
- Tongue
- English
- Weight
- 633 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
The anodic behaviour of zinc in aqueous potassium hydroxide has been investigated at very high cds (l-i0 A/cm% Galvanostatic experiments have been made in aqueous KOH (l-12.8 M) for reaction times O-1 s-O.2 ms. The relationship between the cd and the passivation time follows a l/t relationship. The forms of the overpotential/time curves indicate changes in the ohmic component of the total polarization. Within the time range investigated no evidence was found for a change in the mode of passivation. The effect of an increase of temperature was to increase the passivation time: the magnitude of the increase was greater than expected from the increase in the diffusion coefficient alone. ~&am&---dtude sous des densit& de courant trb Clev&s (l-10 A/cm%), du comportement anodique du zinc dans la potasse aqueuse. Les expkriences galvanostatiques ont 6th effect&es dam des solutions Clectrolytiques de potasse (1-12, 8 M) avec des temps de reaction de 0,l s & 0,2 ms. La relation liant la densit& de courant au temps de passivation est proportionnelle ?t d/t. Les formes des courbes surtension/temps indiquent des variations de la composante ionique de la polarisation totale. Dam l'intervatle de temps co&dir&. aucune preuve n'a pu Ctre faite quant & une modification dans Je mode de passivation. L'influence de l'augmentaion de la tempkrature est censCe augmenter le temps de passivation. La grandeur de cet accroissement est sup&ieure & celle prevue & partir d'un accroissement du coefficient de diffusion seu1. Zusammenfassung-Das Anodische Verhalten von Zink in wlissrigen Kaliumhydroxydlljsungen wurde bei sehr hohen Stromdichten (l-10 A/cm") untersucht. Galvanostatische Experimente in w3ssriger KOH (l-12,8 M) wnrden ftir Reaktionszeiten von 100 bis 0,Z ms durchgefiihrt. Die Beziehung zwischen der Stromdichte und der Passivierungszeit folgt einem t/t-Gesetz.
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