Electrochemical characterization of Ni–Fe alloy codeposition under MHD control

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”.     

Pretreatment effects on the electrochemical responses for aluminium–magnesium alloy AA5083 corrosion behaviour

Electrochemical investigations on aluminium alloy corrosion in a sodium chloride solution have been performed by potentiostatic and potentiodynamic (electrochemical impedance spectroscopy) methods. Measurements have been obtained after mechanical polishing or electrochemical stripping in deaerated or not solution. All the results are strongly depending on the pretreatments that are undergone in the laboratory before the experimental measurements. Mechanical polishing induces huge effects on the surface of the analysed samples and a long time is necessary to avoid the effects of this treatment; instead, an electrochemical cleaning does not modify the surface and results can be regarded more rapidly as significant of the surface with higher reproducibility.     

Zn-Mn alloy coating elaboration by magnetoelectrodeposition

Journal of Solid State Electrochemistry - Zinc-manganese alloy coatings were electrodeposited using sulfate baths in the presence of a superimposed magnetic field up to 1 T parallel to the...     

Magnetic field effect on Zn-Co alloy electroplating

Ionics - Zinc-cobalt (Zn-Co) alloys were electrodeposited under a magnetic field parallel to the electrode from a sulfate bath. These alloys were investigated using chronopotentiometric measurement...