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Voltammetric and morphological characterization of zinc electrodeposition from acid electrolytes containing boric–polyalcohol complexes

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Abstract

The influence of sorbitol or glycerol polyalcohols on the electrodeposition of zinc and on morphology of the zinc film is discussed. The deposition current efficiency, in the potential range −1.30 V to −2.50 V, was ∼90% in all baths. Increasing the sorbitol concentration in the bath shifted the deposition to more negative potentials, ∼50 mV, and decreased the current density (j p ) of the zinc deposition significantly. On the other hand, adding glycerol did not significantly affect either j or the deposition potential of zinc. Scanning electron microscopy (SEM) showed that either sorbitol or glycerol lead to the formation of granular deposits. The best zinc morphology was obtained with 0.52 M sorbitol or glycerol in the plating bath. The presence of sorbitol or glycerol in the plating bath was beneficial, since the resulting zinc deposits were compact and without holes.

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Acknowledgements

Financial support from the Brazilian agencies CNPq (Proc. 303670/2007-0) is gratefully acknowledged.

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Authors and Affiliations

  1. Departamento de Química, Universidade Federal de São Carlos, CP 676, Sao Carlos, SP, 13565-905, Brazil

    E. M. de Oliveira & I. A. Carlos

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  1. E. M. de Oliveira
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  2. I. A. Carlos
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Correspondence to I. A. Carlos.

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de Oliveira, E.M., Carlos, I.A. Voltammetric and morphological characterization of zinc electrodeposition from acid electrolytes containing boric–polyalcohol complexes. J Appl Electrochem 38, 1203–1210 (2008). https://doi.org/10.1007/s10800-008-9534-2

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  • DOI: https://doi.org/10.1007/s10800-008-9534-2

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