In-situ analysis of the ion concentration distribution and the electrolyte convection evolving during electrodeposition in magnetic gradient fields

K. Tschulik - C. Cierpka - X. Yang - M. Uhlemann - K. Eckert - R. Sueptitz - C. J. Kähler - L. Schultz - A. Gebert

IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany }{ Institute for Fluid Dynamics and Aerodynamics, Universität der Bundeswehr München Werner-Heisenberg-Weg 39, 85577 Neubiberg, Germany }{ Institute for Fluid Dynamics, Dresden University of Technology, 01062 Dresden, Germany

Abstract
In-situ velocity measurements were performed during potentiostatic Cu electrodeposition in different magnetic gradient fields (∇\vcB). Astigmatism Particle Tracking Velocimetry was used to enable three-dimensional measurements of al three velocity components in a large part of the cell volume. A complex three-dimensional fluid flow was observed. Thus, the magnetic field gradient force (\vcF_∇B) driven electrode-normal convection during deposition in high ∇\vcB was experimentally proven and the interplay of \vcF_∇B and the Lorentz force could be analysed for different ∇\vcB-setups. Moreover, in-situ measurements of the ion concentration during deposition and dissolution of Cu in a magnetic gradient field were performed by Mach-Zehnder interferometry. Figs 6, Refs 15.