Zinc nickel is an alloy plate consisting of electrodeposited zinc and nickel. When a chromate conversion coating is applied, this finish offers some of the best corrosion resistance available, in excess of 1000 hours salt spray when tested per ASTM B117. The finish is functional and not for aesthetics as the alloy lends itself to a vast array of colors after chromating from light pale yellow to dark purples. The finish offers a good base for painting or other coatings and it was originally developed as a replacement for cadmium plating.