Stabilization of aqueous solutions containing hydrogen peroxide, hydrofluoric acid and metal ions
US4545918A · kind A · utility
15Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 28, 1983 |
| Grant date | Oct 8, 1985 |
| Priority date | — |
| Expiry date | Dec 28, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23F3/06
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Process for improving the stability of aqueous solutions containing hydrogen peroxide, metal ions and hydrofluoric acid which can be partially in the form of salts, comprising adding to the said solution at least one hydroxide selected from alkali metal hydroxides, ammonium hydroxide, or mixtures thereof in an amount which is insufficient to neutralize all the acidity present. The resultant novel stabilized solutions according to the invention are used in the surface treatment of metals especially of stainless steels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.