To make coating for decorative purpose, base metal that will coated with chrome plating usually coated first with nickel. After coated with nickel this base metal ready either coated with copper or chromic acid. The combination of two kind of metal will make this base metal more resistance to corrode and the thickness of coated metal thicker. For decorative coating thickness will vary from a few hundredths of mil to 1 mil. The mirror finish will only be as good as the finish, put on the surface before put on chrome.
For finishing with chrome plating, chrome must be micro finished will give coefficient of friction lower than any other metal when use against steel, iron, brass, bronze, Babbitt or aluminum alloys. To make a double coated don’t use chrome coated with chrome, because chrome is much harder than casehardened steel. Chrome resist to mostly all organic and inorganic compounds and acids, except hydrochloric acid. In sulfuric acid chrome can’t stand for longer use because this acid also very corrosive.
See: Electropolishing of Anodizing
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