## 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 koh solution—IV. Anodic experiments in flowing electrolyte
✍ Scribed by M.J. Brook; N.A. Hampson
- Publisher
- Elsevier Science
- Year
- 1970
- Tongue
- English
- Weight
- 704 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
The passivation of zinc electrodes in alkaline solution has been studied at various rates of solution flow. At constant cd the passivation time is increased by an increase Passivation-time/cd data can be correlated in the form in solution velocity. (i -i&l'* = k, where i, and k arc umstants for given systems. In this present work k was slightly dependent on [Zn(II)] but independent of the solution velocity; il was strongly dependent on the solution velocity. A qualitative model is proposed. R&m&-Etude en solution alcaline de la passivation des &ctrodes de zinc pour diff&entes vitesses d'agitation de la solution. Pour une densit6 de courant constante, le temps de passivation augmente quand la vitesse de la solution augmente. Les variables texnps de passivation/densit6 de courant peuvent &re relit&x selon: (iil)t'le = k 00 il et k sont constantes pour des systemes donut% Darts le pr&ent travail k d+end un peu de [Zn(II)] mais est ind+endant de la vitesse d'agitation de l'&x3rolyte; ir depend beaucoup de c&te vitesse. L'on sugg&re un modele en rendant compte qualitativement. Zll-eafassun g-Die Passivierung von Zinkelektroden in alkalischer Lbsung wurde bei verschie-&ner Strdmungsgeschwindigkeit der Li5sung untersucht . 3ei konstanter Stromdichte nimmt die Passivierungszeit mit zunehmender Strtjmungsgeschwindigkeit zu. Die erhaltenen Daten k&men durch die folgende Gleichung in Zusammenhang gebracht werden: (i -il)+ = k wobei i2 und k ftir ein gegebenes System Konstanten sind. In den vorliegenden Untersuchungen war k in geringem Masse von [Zn(II)l, nicht aber von der Stromungsgeschwindigkeit abh$lngig; i, hing sehr stark von der Geschwincligkeit ab. Ein qualitatives Model1 wird vorgeschlagen.
📜 SIMILAR VOLUMES
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
Passivation of spec-pure Sn was studied in aerated, unstirred solutions of acid sulphate (H2S04/Na2S04) and neutral suphate (Na2S04) using the potentiodynamic technique from an initial cathodic potential (-ve to open circuit potential) in the anodic direction and backwards to the initial potential.