The Electrodeposition of Zinc on Aluminium and Its Alloys

Dull nickel deposits may be given a brilliant finish by a brief anodic treatment in a sulphuric acid solution; polishing action is obtained over a wide range of conditions. The method has possibilities as an alternative to bright nickel plating and the process has been investigated from this point of view. Under suitable conditions, the process does not adversely affect the protective properties of the deposit and the quality of the finish is at least as good as that obtained by bright nickel plating. The method also enables designs to be formed on nickel surfaces by localising the area polished, and attractive finishes may be produced in this way.