Patent ID: 7160629
Filing Date: 2007-01-09
Classification: B32B,C22C,C25D,H01L,Y10S,Y10T

Abstract:
1. A bright tin or bright lead-free tin-alloy deposited on a substrate by (a) providing an electrolyte comprising one or more tin compounds, one or more acidic electrolytes, and one or more carboxylated polyalkyleneimine compounds having a molecular weight of 1000 to 200,000 Daltons and 50% or greater carboxylation, and one or more polyalkylene glycols having a molecular weight range of 200 to 100,000 Daltons, and (b) depositing the bright tin or bright lead-free tin-alloy on the substrate at a current density of 0.1 to 200 ASD, the bright tin or bright lead-free tin-alloy has no whiskers after 4 months storage at 52° C. and 98% relative humidity.