H2o pump boiled

The metal to be cleaned is grounded just like welding. Get it backwards and the object becomes the sacrificial anode.

The vat in the background is actually for stripping rims, and I welded up a rack out of 1/2 steel rod that has a line of sight to all angles of the submerged part of the rim, so it just needs to be rotated to do all the work.

You can see the water line where the pump was dipped. I flipped the plate on the other two bolt on the opposite side in order to get the part that wasn't submerged in the washing soda.