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Effect of diethanolamine and triethanolamine on the properties of electroplated Zn–Ni alloy coatings from acid bath

Authors

  • Olfa Hammami,

    Corresponding author
    1. Unit of Research “COPROMET” ENIT, BP 37, Belvedere, University Tunis-El Manar, Tunis 1002, Tunisia
    2. Institut UTINAM, CNRS UMR 6213, Équipe Sonochimie et Réactivité des Surfaces, Université de Franche-Comté, 16 Route de Gray, 25030 Besançon Cedex, France
    • Unit of Research “COPROMET” ENIT, BP 37, Belvedere, University Tunis-El Manar, Tunis 1002, Tunisia.
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  • Leila Dhouibi,

    1. Unit of Research “COPROMET” ENIT, BP 37, Belvedere, University Tunis-El Manar, Tunis 1002, Tunisia
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  • Patrice Berçot,

    1. Institut UTINAM, CNRS UMR 6213, Équipe Sonochimie et Réactivité des Surfaces, Université de Franche-Comté, 16 Route de Gray, 25030 Besançon Cedex, France
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  • El Mustafa Rezrazi,

    1. Institut UTINAM, CNRS UMR 6213, Équipe Sonochimie et Réactivité des Surfaces, Université de Franche-Comté, 16 Route de Gray, 25030 Besançon Cedex, France
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  • Ezzeddine Triki

    1. Unit of Research “COPROMET” ENIT, BP 37, Belvedere, University Tunis-El Manar, Tunis 1002, Tunisia
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Abstract

In the present work, zinc–nickel alloy coatings have been produced under direct current conditions from an acid bath with different concentrations of diethanolamine (DEA) and triethanolamine (TEA). The produced coatings were analysed through chronopotentiometry, microhardness, X-ray diffraction and MEB techniques. The compositional analysis of the films showed that the Zn–Ni electrodeposition is anomalous for all the systems. Ethanolamines augmented the anomalous behaviour. The hindering in the Ni (II) reduction will be more effective due to complexation of Ni (II) catalyst with ethanolamines. Electrochemical and structure analysis of deposits indicated the presence of γ and highly Zn-enriched phases. The presence of these additives resulted also in coatings with finer grains. The behaviour of modified Zn–Ni alloy coatings in corrosion solution of 3% NaCl was investigated through potentiodynamic polarisation and electrochemical impedance spectroscopy. It was found that the obtained Zn–Ni/3 mM TEA alloy exhibited better corrosion resistance compared to pure Zn–Ni alloy electrodeposited at similar conditions. © 2012 Canadian Society for Chemical Engineering

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