Electrochemical characterization of Ni–Fe alloy codeposition under MHD control |
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Authors: | J.-P. Chopart O. Aaboubi K. Msellak |
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Affiliation: | (1) Dynamique des Transferts aux Interfaces, EA 3803, Université de Reims Champagne-Ardenne, BP 1039, 51687 Reims Cedex 2, France |
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Abstract: | The nickel–iron alloy electrodeposition is affected by a superimposed magnetic field. Some previous papers [Msellak et al., Magnetohydrodynamics, 39:487–493, 2003 and Msellak et al., J Magn Magn Mat, 281:295–304, 2004] have exhibited some dramatic changes in iron amount and morphology of these deposits. As it is usual for a magnetic field up to 1 T, no charge transfer effect can be expected, and the observed modifications can be explained by the magnetohydrodynamic convection that controls the iron species flux during the electrochemical reaction. By electrochemical impedance spectroscopy and physical investigations (scanning electron microscopy, X-ray diffraction, and inductively coupled plasma), the reduction process is analyzed, the characteristic parameters of the mechanism are determined, and the magnetic field effects can be quantified. Contribution to special issue on “Magnetic field effects in Electrochemistry”. |
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Keywords: | Iron– nickel alloy Electrodeposition Magnetohydrodynamics Electrochemical impedance spectroscopy |
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