Method for pickling or cleaning materials of steel, in particular stainless steel
US5164016A · kind A · utility
22Cited by
3References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1991 |
| Grant date | Nov 17, 1992 |
| Priority date | — |
| Expiry date | Feb 5, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23G1/088
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Method for pickling or cleaning materials of steel, in particular stainless steel, comprising treating the materials with an aqueous solution containing ferrous ions and ferric ions and an organic acid which does not oxidize the iron in an amount sufficient to maintain the Fe.sup.2+ and Fe.sup.3+ ions in solution, the ferric and ferrous ions being present in the solution in a ration Fe.sup.2+ /Fe.sup.3+ between 10/90 and 40/60, and maintaining the ration Fe.sup.2+ /Fe.sup.3+ within the defined range by addition of hydrogen peroxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.