Electroplating bath containing citric acid or citrate for tin or tin alloy plating
US5118394A · kind A · utility
7Cited by
5References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1990 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Dec 5, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D3/32
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A brightener is added in the ratio of 0.5-5 g per 1 l of electric plating bath of pH 4-8 containing citric acid or citrate for tin or tin alloy plating. The brightener contains a water soluble reaction product obtained by reacting polyamine such as pentaethylenehexamine, aliphatic aldehyde such as formaldehyde, and aromatic carboxylic acid such as methyl benzoate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.