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

K. Tschulik¹ - C. Cierpka² - X. Yang³ - M. Uhlemann¹ - K. Eckert³ - R. Sueptitz¹ - C. J. Kähler² - L. Schultz¹ - A. Gebert¹

¹ IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany
² Institute for Fluid Dynamics and Aerodynamics, Universität der Bundeswehr München Werner-Heisenberg-Weg 39, 85577 Neubiberg, Germany
³ 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 (F_∇B) driven electrode-normal convection during deposition in high ∇B was experimentally proven and the interplay of F_∇B and the Lorentz force could be analysed for different ∇B-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.