Coating processes – Coating by vapor – gas – or smoke – Metal coating
Patent
1987-05-29
1990-02-27
Silverberg, Sam
Coating processes
Coating by vapor, gas, or smoke
Metal coating
C23C 1600
Patent
active
049045016
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.
REFERENCES:
patent: 2855332 (1958-10-01), Samuel
patent: 3775151 (1973-11-01), Baker
patent: 4004047 (1977-01-01), Grisik
patent: 4126488 (1978-11-01), Kunst
Edwards Robert J.
Kalka Daniel S.
Matas Vytas R.
Silverberg Sam
The Babcock & Wilcox Company
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