Metal article coated with multilayer finish inhibiting whisker growth

摘要

In accordance with the invention, a metal substrate is coated with a multilayer finish comprising a layer of tin or tin alloy and one or more outer metal layers. An optional metal underlayer may be disposed between the substrate and the tin. In an exemplary embodiment the metal substrate comprises copper alloy coated with a nickel underlayer, a layer of tin and an outer metal layer of palladium. The resulting structure is particularly useful as an electrical connector or lead frame.