Method and composition for removing nickel aluminide coatings from nickel superalloys
US4425185A · kind A · utility
25Cited by
6References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1982 |
| Grant date | Jan 10, 1984 |
| Priority date | — |
| Expiry date | Mar 18, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23F1/44
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Disclosed is a method for stripping nickel aluminide coatings of up 10 weight percent aluminum from nickel base alloy substrates at room temperature. The preferred solution contains by volume percent 43-45 nitric acid, 7-12 hydrochloric acid, 0.1-1.5 sulfuric acid, balance water; it also contains 0.008-0.025 moles per liter of ferric chloride, at least 0.016 moles per liter copper sulfate. The ratio between the sulfate and chloride is 2:1 or greater.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.