Corrosion risk of SO2 on silver plating of electric components

Abstract

With the miniaturization and high integration of electronic devices, the reliability of the devices will be seriously reduced by the small corrosion of silver plating. As common corrosion pollutants, SO2 have strong corrosion sensitivity to silver. Using the G1 limit in ANSI/ISA 71.04 as the baseline,hour-by-hour SO2 concentration data for 210 cities show that the SO2 ranges from 1-993μg/m3, with an average of 20.80% of days ratio and 8.04% of hours ratio exceeding G1 level requirements, indicate a momentary high corrosion risk in the actual running environment. For silver plating, the corrosion risk of independent parameters conforms to the law of power function. Under the comprehensive influence of multiple factors, the corrosion thresholds of some parameters will decrease and the corrosion risk of electronic devices in service will increase.