Electrolyte composition, method, and improved apparatus for high speed tin-silver electroplating
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United States of America Patent
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May 14, 2013
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Jun 4, 2010
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Jun 7, 2009
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Abstract
The invention provides an electroplating composition, method, and improved apparatus, which enables electroplating tin-silver alloys at high speed and without burning. The composition is an aqueous acidic solution including salts of stannous tin and a monovalent silver, and a complexing agent selected from the group consisting of thiocarbazides and thiohydrazides, and optionally an aldehyde and/or dialdehyde organic brightener compound. A sulfonic acid and a surfactant may also be included. The improved apparatus provides a protective structure substantially surrounding the anode(s) to decrease turbulence and the problematic silver displacement reaction.
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