Bath and process for plating tin, lead and tin-lead alloys
AssigneeLeaRonal, Inc.
InventorsFred I. Nobel, Barnet Ostrow, David N. Schram
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Abstract
This invention relates to the electrodeposition of tin, lead and particularly tin-lead alloys from an electroplating bath comprising a lead and/or tin alkylsulfonate, an alkylsulfonic acid in a sufficient amount to impart a pH below about 3 to the bath, and various additives to improve the brightness of the deposits, the useful current density ranges, and/or the solderability of tin-lead alloy deposits including quaternary nitrogen wetting agents containing a fatty acid radical, alkylene oxides, pyridine compounds, aromatic aldehydes, acetaldehyde and/or a bismuth compound.
Claims24
An electrolytic bath for the electrodeposition of tin, lead and tin-lead alloy metals comprising an aqueous solution containing the metal or metals as a soluble alkyl sulfonate salt, a soluble alkylsulfonic acid in a sufficient amount to impart a pH below about 3 to the bath, and a quaternary nitrogen-fatty acid wetting agent in sufficient amount to improve the throwing power of the bath and the surface finish of the electrolytic deposit.
An electrolytic bath for the electrodeposition of tin-lead alloys comprising an aqueous solution containing tin and lead as soluble alkyl sulfonate salts, a soluble alkylsulfonic acid salt in a sufficient amount to impart a pH below about 3 to the bath, and a quaternary nitrogen-fatty acid wetting agent in sufficient amount to improve the throwing power of the bath and the surface finish of the electrolytic deposit.
A method for electroplating tin, lead, or tin-lead alloy metals which comprises immersing a substrate to be plated in a electroplating bath comprising an aqueous solution containing the metal or metals as a soluble alkylsulfonate salt, a soluble alkylsulfonic acid in a sufficient amount to impart a pH below about 3 to the bath, and a quaternary nitrogen-fatty acid wetting agent in sufficient amount to improve the throwing power of the bath and the surface finish of the electrolytic deposit.
Dependencies are inferred from the claim text.