Aqueous solution of zinc nitrite and method for production thereof
US7083772B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2002 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Jul 2, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/73
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An aqueous zinc nitrite solution which contains substantially no calcium (Ca) ions is provided, in which, in terms of the aqueous zinc nitrite [Zn(NO2)2] solution having an NO2 concentration of 10% by weight, the sodium (Na) ion concentration is 200 to 2000 ppm and the sulfate (SO4) ion concentration is 20 ppm or less in the solution. The aqueous zinc nitrite solution can be prepared by providing a zinc compound and an alkali nitrite as raw materials and subjecting the raw materials to electrolytic synthesis through a double decomposition reaction using an ion-exchange membrane as a diaphragm. As the aqueous zinc nitrite solution is provided, an extremely efficient metal surface treatment is made possible which has a reduced amount of sodium ions. In particular, it contains substantially no sulfate ions and no calcium ions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.