Australia's Science Forum

I have some carbon electrodes that were plated with copper. Some carbon electrodes have been cleaned with elbow grease and steel wool but I can't get the copper off some of the electrodes no matter how hard or how long I scrub. Any ideas?

A fairly strong molarity Nitric acid works a treat. You do need to leave them to soak for a while, all day or overnight, and the copper will come off. I did mine earlier in the year a some took a couple of soaks, changing the acid in between.

I'll have to remember that tip for next time! I've only used emery paper on them as I didn't know how to remove the copper either. Thanks!

thanks for the tip on cleaning carbon electrodes
was just about to post this very question
you are all always so helpful
maria