Effect of natural and magnetic convections on the structure of electrodeposited zinc-nickel alloy |
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Authors: | A Levesque S Chouchane R Rehamnia |
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Institution: | a LACMDTI URCA, BP 1039, 51687 Reims Cedex2, France b Faculté des Sciences, Université Badji Mokhtar, Annaba, Algérie |
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Abstract: | The effects of a magnetic field applied in a direction parallel or perpendicular to the cathode substrate plane, during electrodeposition process of Zn-Ni alloy have been investigated by means of chronoamperometric measurements, X-ray diffraction and EDX analysis. The modification of crystal orientation of the alloy by the superimposition of a high magnetic field is discussed for alloys with a content of nickel range 6-13 at%. Whatever the phase composition obtained without magnetic field, either γ-Ni5Zn21 or a mixture of the γ and zinc phases, which depends on the concentration of Ni2+ in the electrolyte bath, the preferential orientation (1 0 1) of the zinc phase is always favoured with perpendicular and parallel magnetic field. There is no saturation of this effect with amplitude of B up to 8 T. A study of different geometric configurations of the cathode, which induce more or less natural convection, consolidates these results. The structural modifications of Zn-Ni alloy electrodeposits are thus probably due to a magnetohydrodynamic effect. An additional phenomenon is observed in presence of a perpendicular applied magnetic field since the (3 3 0) preferential orientation of the γ-Ni5Zn21 disappears with high values of B. |
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Keywords: | Zn-Ni alloy Magnetic field Electrodeposition XRD Magnetoelectrochemistry Magnetohydrodynamics |
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