Kinetics and mechanism of PbSO<sub>4</sub> electroformation on Pb electrodes in H<sub>2</sub>SO<sub>4</sub> aqueous solutions
The electrochemical processes related to the passivation of Pb in 5 M H<sub>2</sub>SO<sub>4</sub> at 25°C, have been investigated combining a rotating ring-disk electrode, linear potential sweep voltammetry and potentiostatic pulse techniques complemented with scanning elec...
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| Autores principales: | , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
1993
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/121653 |
| Aporte de: |
| Sumario: | The electrochemical processes related to the passivation of Pb in 5 M H<sub>2</sub>SO<sub>4</sub> at 25°C, have been investigated combining a rotating ring-disk electrode, linear potential sweep voltammetry and potentiostatic pulse techniques complemented with scanning electron microscopic imaging. The kinetics of PbSO<sub>4</sub> anodic layer growth can be explained through the initial formation of a barrier layer acting as an ionic conductor, and the transference of Pb<sup>2+</sup> cations from the substrate the conducting layer yielding Pb<sup>2+</sup> ion in the solution. These ions further contribute to passivation through the precipitation of a PbSO<sub>4</sub> passivating layer. |
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