Investigation of the effects of the magnetic field on the anodic dissolution of copper in NaCl solutions with holography

The anodic dissolution of copper in NaCl solutions with the application of an external magnetic field of 450 mT is studied by digital holography. The effects of the field on the basic electrochemical processes are visualized through reconstructed phase maps, which enable direct observation of the magnetohydrodynamic flow during the electrochemical mass transport. The magnetic field affects the anodic dissolution of copper in chloride media in two ways: restraining the formation of the CuCl salt layer, increasing the mass transport rate. The presentation of dynamic phase maps through the video enhances the power of digital holography in investigating electrochemical processes.

The snapshots and the video of the anodic dissolution of copper with the magnetic field (MF) are presented. The MF accelerates the mass transport rate, inhibiting the formation of the CuCl salt layer.Figure optionsDownload as PowerPoint slideHighlights
► We realize direct observation of the magnetohydrodynamic flow on electrochemical mass transport.
► The magnetic field (MF) inhibits the formation of the CuCl salt layer.
► The MF accelerates mass transport rate especially in the current plateau region.
► Copper anodically dissolves as cuprous ions at the initial stage in NaCl solution.
► Holography has been enhanced in dynamic observation of electrochemical processes.