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Morphology and Texture of Zinc Deposits Formed at the Edge of a Rotating Washer Electrode

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Abstract

In this paper, a rotating washer electrode was used to simulate the industrial conditions of strip edges during electrogalvanizing. Using this experimental setup, morphology and texture of the zinc deposits and dendrites formed at the edge of the electrode were studied. Dendrite precursors in the corner of the washer edge were well characterized and their nucleation and growth were also studied. The results indicated that the rotation speed has little effect on texture while, in contrast, current density modifies dendrite’s texture. It was found that dendrites are formed by platelets which are stacked on one another, which grow up in a series of steps oriented in the direction of growth of the dendrite’s stem yielding highly oriented structure. The presence of sodium ions in the electrolyte changes the morphology and shape of dendrites leading to rounded, ‘cabbage’-shaped crystals, while thiourea changes the morphology of both the deposit in the flat portion of the washer and the dendrites through adsorption on the zinc surface.

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Acknowledgments

The authors would like to acknowledge the Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and Universidad Nacional de La Plata (UNLP) for their financial support to this work.

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Authors and Affiliations

  1. Centro de Investigación y Desarrollo en Tecnología de Pinturas (CIDEPINT), CICPBA-CONICET, Av. 52 e/ 121 y 122, 1900, La Plata, Argentina

    L. N. Bengoa, P. R. Seré & W. A. Egli

  2. Engineering School, Universidad Nacional de La Plata, Av.1 y 47, 1900, La Plata, Argentina

    L. N. Bengoa, P. R. Seré & M. S. Conconi

  3. Centro de Tecnología de Recursos Minerales y Cerámica (CETMIC), CICPBA-CONICET, Cno. Centenario y 506, 1900, La Plata, Argentina

    M. S. Conconi

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  1. L. N. Bengoa
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  2. P. R. Seré
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  3. M. S. Conconi
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  4. W. A. Egli
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Correspondence to L. N. Bengoa.

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Bengoa, L.N., Seré, P.R., Conconi, M.S. et al. Morphology and Texture of Zinc Deposits Formed at the Edge of a Rotating Washer Electrode. J. of Materi Eng and Perform 25, 2936–2942 (2016). https://doi.org/10.1007/s11665-016-2163-8

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  • DOI: https://doi.org/10.1007/s11665-016-2163-8

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