Tarnish Inhibiting Composition for Metal Leadframes
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United States of America Patent
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Issued Date -
Feb 21, 2013
app pub date -
Aug 19, 2011
filing date -
Aug 19, 2011
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Abandoned
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Abstract
An aqueous tarnish inhibiting solution comprising a mercapto carboxylic acid and a corrosion inhibitor to produce an anti-tarnish layer on metal surfaces, such as silver plated copper leadframes and a method of using the same is provided. The composition provides an improved anti-tarnish layer that does not affect wirebondability or the adhesion of a mold compound to a leadframe.
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