Limiting the loss of tin through oxidation in tin or tin alloy electroplating bath solutions
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United States of America Patent
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Aug 2, 2005
Grant Date -
Dec 11, 2003
app pub date -
Mar 5, 2003
filing date -
Mar 5, 2002
priority date (Note) -
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Abstract
Provided for is a solution for use in the electroplating of tin and tin alloys comprising a basis solution comprising an acid, optionally a salt thereof, the acid selected from the group consisting of fluoboric acid, an organic sulfonic acid, a mineral acid, or a combination thereof; divalent tin ions; and an antioxidant comprising a hydroxy benzene sulfonic acid or salt thereof, in an amount effective to prevent the oxidation of divalent tin ions. Also provided for is a method for electroplating comprising electroplating a substrate using an electroplating solution comprising a hydroxy benzene sulfonic acid or salt thereof in an amount effective to decrease the oxidation of tin ions.
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