Process for inhibiting the corrosion of a metal installation in contact with an acid bath
US4402759A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 4, 1980 |
| Grant date | Sep 6, 1983 |
| Priority date | — |
| Expiry date | Sep 4, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23G1/04
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The invention relates to a process for inhibiting the corrosion of an installation, made of a material chosen from amongst the metals which are less noble than hydrogen, and their alloys, in contact with an acid bath containing an alkylpyridinium chloride. A soluble cyanide complex, which is capable of forming an insoluble compound by reacting with ferric ions in the bath, is added to the bath so as to limit the concentration of the ferric ions in the bath to a maximum of 30 mg/kg. The content of ferric ions in the bath is controlled by means of a potentiometric measurement so as to bring the potential of the bath into the region of a predetermined value. The invention applies in particular to the treatment of baths for cleaning or descaling steel installations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.