Method for chromizing of boiler components
US4904501A · kind A · utility
19Cited by
4References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 29, 1987 |
| Grant date | Feb 27, 1990 |
| Priority date | — |
| Expiry date | May 29, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C10/60
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An improved method of chromizing the surface of a ferritic boiler component. An aqueous coating composition is applied to the surface to be chromized, which includes at least 10% by weight of chromium, at least 12% by weight alumina, a binder of ammonium alginate or methyl cellulose, and a halide activator, and in which the weight ratio of chromium to water is greater than 0.7. Alternative embodiments involve the application of a halide activator over the top of a previously applied and dried coating that is lacking said halide activator, as well as to the application of multiple layer single component slurry coatings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.