Method for removing iron sulfide scale from metal surfaces
US4381950A · kind A · utility
64Cited by
7References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 5, 1982 |
| Grant date | May 3, 1983 |
| Priority date | — |
| Expiry date | Aug 5, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23G1/088
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A process for reducing hydrogen sulfide gas evolution during dissolution of ferrous sulfide with an aqueous acidic solution comprising contacting the ferrous sulfide with an aqueous acidic solution containing an effective amount of an additive comprising at least one member selected from the group consisting of maleic acid, maleic anhydride and the alkali metal and ammonium salts of maleic acid. The aqueous acidic solution also can contain corrosion inhibitors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.