Passivation of stainless steels in organosulphonic acid medium
US6120619A · kind A · utility
32Cited by
6References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1999 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | Jan 12, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/50
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
To avoid the corrosion of stainless steels in organosulphonic acid medium, at least one oxidizing agent selected from cerium(IV), iron(III), molybdenum(VI) or vanadium(V) oxides or salts, nitrites and persulphates, is added to the medium in an amount which is sufficient to place the spontaneous potential between the passivation and transpassivation potentials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.