While doing the intake refresh on the ‘86.5 928S I wanted to restore some of the clamps, tubes, and other metal parts to their original yellow cadmium finish. Unfortunately, cadmium plating is basically illegal these days because of environmental concerns.
I ended up choosing Caswell Copy Cad kit. It simulates cadmium plating of metals.
This is a list of what I used to plate.
Caswell Copy Cad Plating Kit, which will include plating solution and a zinc plate (which sacrifices itself to plate your things.) I bought an extra zinc plate as well.
Yellow Chromate (to simulate the Cadmium color)
Extra “brightening solution.” It goes quickly.
A thermostat for the heating unit, and a heavy-duty glass thermometer.
An aerator pump for the plating solution.
A constant current rectifier. Mine is a 5 ampere maximum unit. That means that I can plate 5/.14 = 35 square inches maximum at a time. Caswell sells them, but I bought mine online.
You will also need
4 two-gallon buckets, one each for plating solution, hydrochloric acid (diluted to 5%), distilled water, and yellow chromate solution.
A copper pipe, which you will cut and bend the ends to fit over one of the buckets.
Two alligator clips of different colors (Anode and cathode are very important!)
Very thick rubber gloves
Something to strip the parts down to bare metal before plating, whether that be a wire wheel, bead blasting cabinet, or both.
This is the rectifier setup.