Aqueous solution containing divalent iron ions
US8734579B2 · kind B2 · utility
1Cited by
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8Claims
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Key dates
| Filing date | Oct 25, 2010 |
| Grant date | May 27, 2014 |
| Priority date | — |
| Expiry date | Jul 19, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D21/18
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An aqueous solution containing divalent iron ions having improved storage stability such that the oxidation over time of divalent iron ions in the aqueous solution containing divalent iron ions to trivalent iron ions is suppressed and the occurrence of the precipitation of iron (III) hydroxide is prevented for long periods. The aqueous solution contains divalent iron ions having improved storage stability characterized in that it contains divalent iron ions and a hydroxylamine salt as a reducing agent and has a pH of 3.0 or lower. The pH is preferably 2.2 or lower and more preferably 1.2 or lower.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.