Method for descaling ferrous metals
US3951681A · kind A · utility
10Cited by
6References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1973 |
| Grant date | Apr 20, 1976 |
| Priority date | — |
| Expiry date | Nov 1, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23G1/28
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A ferrous metal product to be cleaned is immersed in an oxidizing molten salt bath forming a conditioned scale on the surface of the metal. The conditioned scale is subsequently removed from the metal surface by immersing the metal product in an aqueous caustic bath containing alkali metal hydroxide with alkali gluconate and triethanolamine serving as sequestering agents. The caustic bath may optionally include a brightening catalyst or ethylenediamine-tetracetic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.