Removing metal ions from the solution of electropolished kovar alloy

Electropolishing is a metal surface treatment technique, that involves the selective removal of particles from the metal's outer surface via the application of a controlled potential in an ionic solution. The aim of electropolishing is to obtain a smooth surface by removing ions on the metal surface in an appropriate solution to provide better performance parameters and improve the resistance of the parts against corrosion. However, the dissolution of metal ions during electropolishing leads to significant solution contamination, necessitating frequent replacement. This study focuses on collecting metal ions generated during Kovar alloy electropolishing onto a copper foil through electrodeposition, thus enabling the reuse of the electropolishing solution. Electrodeposition experiments were conducted using graphite or titanium anodes and copper foil cathodes. The optimal results were obtained with a voltage of 13 applied for 2 h, maintaining a pH of 3 at 25°C. This approach efficiently cleanses electropolishing solutions, fosters sustainable use and minimizing environmental impact.