Spontaneous Growth of Whiskers on Tin Coatings: 20 Years of Observation

摘要: SummaryTin coatings and some tin alloy from various plating baths on several substrates have been kept under observation for spontaneous whisker growth periods up to 20 years. A review of the results information obtained elsewhere suggests that, although assured immunity whiskers may be difficult achieve pure coatings, risks can greatly reduced by care in selection type thickness substrate, other measures. Thin brass without an undercoat departures good practice all increase risk. Bright, as deposited, are more susceptible than matt flow brightened or hot dipped a low Post-plating heat treatment at 180–200°C is useful coatings. Alloy much lower risk with tinnickel (65% tin) immune containing lead providing close approach immunity.