Method for replenishing tin and its alloying metals in electrolyte solutions
US8920623B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 2009 |
| Grant date | Dec 30, 2014 |
| Priority date | — |
| Expiry date | Jul 27, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D21/18
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Methods are disclosed for replenishing tin and its alloying metals in an aqueous electrolytic plating bath using an acidic solution containing stannous oxide. During electroplating of tin or tin alloys the stannous ions and alloying metal ions are depleted. To maintain continuous and efficient electroplating processes predetermined amounts of the plating bath containing tin and its alloying metals are bailed out. The bail out is then mixed with a predetermined amount of acidic solution containing stannous oxide and any alloying metals. The mixture is then retuned to the plating bath to return the stannous ions and alloying metal ions to their steady state concentrations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.