Electroless nickel plating baths
US5258061A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1992 |
| Grant date | Nov 2, 1993 |
| Priority date | — |
| Expiry date | Nov 20, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C18/34
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Aqueous electroless nickel plating solutions comprising a water soluble nickel salt associated with a neutral zwitterion, e.g. alanine or glycine, and/or monovalent anion, e.g. lactate, nitrate, hypophosphite, acetate, sulfamate, hydrochloride, formate, propionate, trichloroacetate, trifluoroacetate, methanesulfonate, glycolate, aspartate or pyruvate, as counterion and chelant, a neutral, e.g. borate, or monovalent, e.g. hypophosphite, reducing agent, and a non-thiourea stabilizer, e.g. protonated dimethylamine or dimethylaminopropylamine or 2-hydroxyethanesulfonic acid. Valuable components of spent baths, e.g. nickel and neutral or monovalent anion species, can be advantageously recycled by employing solvent extraction and anion filtration operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.