Pb Free Zn-Sn-Ni Alloy Coated Steel Sheet for Electric Devices

摘要

Environmental problems in recent years areincreasing demand for freedom from lead. Nippon Steeldeveloped Zn-Sn-Ni alloy coated steel sheet that improves onthe corrosion resistance and whisker formation of electrolytictinplate traditionally used as coated steel for electronic parts.The zinc, tin, and nickel are sequentially applied to steel strip onand electrolytic tinning line and are subjected to a thermaldiffusion alloying treatment by a reflow unit to form a Zn-Sn-Nialloy mainly composed of Sn and Zn. The Zn-Sn-Ni alloycoated steel sheet features excellent corrosion resistance,solderability and whisker resistance as coated steel sheet for electronic parts.