Synergetic Effects of Temperature and Perpendicular Magnetic Field on Zn-Ni Alloy Electrodepositing Process

International audienceThe zinc-nickel alloys were electrodeposited on stainless steel substrates during a chloride acid bath. The electroplating processes were investigated under a moderate perpendicular magnetic flux at uncommon temperatures. The coatings obtained were characterized by scanning microscopy (SEM) including EDX and X-ray diffraction (XRD). Chronopotentiometric curves were additionally implemented for electrochemical analysis. Structural analysis revealed that the obtained alloys consisted of a mix of the homogeneous phase γ-Ni3Zn22 and α-Zn-Ni at 70 ºC. The alloys variations observed within the chemical composition, crystallographic phases and morphology of the alloys. It is often explained particularly, by the progressive hydrogen reaction and therefore the evolution of the adsorbed intermediate species. The synergetic effect was significant at 70 ºC within the 1T field, including the appearance of normal co-deposition

Calcium phosphate powder synthesis by out-of-phase pulsed sonoelectrochemistry

International audienceHigh aspect ratio calcium phosphate (CaP) nanorods were achieved by out-of-phase pulsed sonoelectrodeposition from electrolytic aqueous bath composed of calcium nitrate, ammonium dihydrogenophosphate and surfactant at pH of 4.9. The nature of CaP phases was determined by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR) and energy dispersive X-ray spectroscopy (EDX). The results reveal the predominantly presence of calcium deficient hydroxyapatite (CDHA). The transmission electron microscopy (TEM) analyzes highlighted that the nanorods are polycristalline and have an aspect ratio up to 30

Experimental and numerical investigations of Electro-chemical Processes Controlled by High magnetic Fields

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ELECTRO-CHEMICAL PROCESSES CONTROLLED BY HIGH MAGNETIC FIELDS: APPLICATION TO MHD SEA WATER PROPULSION

International audienceThe flow generated by a seawater magnetohydrodynamic thruster has been investigated experimentally and numerically on a miniature model constructed in the laboratory and used in a high magnetic field up to 13 T. The same device was used to study MHD flows of electrolytes controlled by currents limited by mass transfer. A theoretical analysis of these flows has also been performed and both experimental and numerical results agree to this analysis