Process for depositing a silica coating on a metal surface

Details Process for depositing a silica coating on a metal surface Process for depositing a silica coating on a metal surface

1985-01-18

1986-01-14

Childs, S. L.

Coating processes

With post-treatment of coating or coating material

Heating or drying

427239, 4273765, 4273977, B05D 302

Patent

active

045645370

ABSTRACT:
Silica may be deposited on metal surfaces e.g. on heat exchanger surfaces to reduce undesirable deposits by the following aqueous process. Finely divided moist silicic acid of defined particle size is mixed with hot (e.g. at least 98.5.degree. C.) pure water for not more than 1 hour. The mixture is subjected to depolymerization by heating at specified pH so as to depolymerize substantially all the silica. The resulting aqueous silica is then passed over the surface to be coated at temperature above 80.degree. C. so as to deposit a hard bound silica coating.

REFERENCES:
patent: 2408654 (1946-10-01), Kirk
patent: 3013897 (1961-12-01), Cupery et al.
patent: 3013898 (1961-12-01), Dempcy
patent: 3133829 (1964-05-01), Cupery et al.
patent: 4487815 (1984-12-01), Dorsett et al.

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