Pickling agent containing urea and method of producing it
US6844304B2 · kind B2 · utility
1Cited by
2References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 12, 2001 |
| Grant date | Jan 18, 2005 |
| Priority date | — |
| Expiry date | Apr 23, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23G1/025
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A long-time stable pickling agent for the removal of an oxide layer on a stainless steel after heat treatment, such as welding, which pickling agent comprises nitric acid and fillers and constitutes of a pickling paste or pickling gel to be coated on the heat treated stainless steel, or of a pickling liquid to be sprayed on the steel. According to the invention, the pickling agent also comprises urea for reduced formation of nitrous fumes when the pickling agent is used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.