Gallic acid as a combination antioxidant, grain refiner, selective precipitant, and selective coordination ligand, in plating formulations
AssigneeTechnic, Inc.
InventorsMichael D. Gernon, Hanoch S. Elroi, Brenda A. DeCesare, Florence P. Butler
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Abstract
This invention relates to additives for methanesulfonic acid based tin and tin alloy plating formulations. Specifically, the invention involves the use of gallic acid in the multiple roles of antioxidant, grain refiner, selective precipitant, and selective chelator in methanesulfonic acid based tin or tin alloy plating formulations.
Claims21
A method of improving acidic tin and tin alloy electroplating baths, which comprises adding gallic acid thereto, whereby the resulting improvement is selected from one or more of the following bath properties, oxidation stability, grain refinement, selective precipitation of Sn(IV) and chelation or complex coordination of other metals in the bath.
In an acidic electroplating bath composition comprising a conductive electrolyte and a soluble tin plating salt, wherein the improvement comprises;
- gallic acid added thereto to serve as an antioxidant, selective chelator, and selective Sn(IV) precipitant.
Dependencies are inferred from the claim text.