Electrolyte composition, method, and improved apparatus for high speed tin-silver electroplating
US8440065B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 2010 |
| Grant date | May 14, 2013 |
| Priority date | — |
| Expiry date | Apr 19, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D3/60
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.