The steps for tank  plating of  Chrome over steel, pot metal, zinc diecast or other metals is very similar to the tank plating of any common metal other then aluminum. Like any plating, most of the work is in the preparation. Preparation for plating is very similar to preparation for painting. The end results can only be as good as the finish on the piece before you start plating it. Sand, buff or polish the piece to get a good surface finish. Make sure you have removed all of the paint on the  area that you want to plate.

The next step is cleaning the piece making sure that all of the dirt, oil and grease is off of the work piece. You can clean it with Electro cleaner, detergent and water or a good degreaser.  The main thing is to give it a water test after cleaning it. In a water test, when you rinse the piece, check to see if the water flows evenly across the work piece without any breaks. If the water doesn't flow evenly over the piece or it breaks up, then you know the that the piece still has dirt or grease on it and more cleaning is necessary.

The work piece is first plated with .an alkaline copper as an acid base copper would attack the steel or pot metal. In the old days, cyanide copper was used for the first step but over the years alkaline copper has replaced the cyanide. The only problem with an alkaline or cyanide copper is that they are a preplate and will not grow thickness.