Process for forming a silicate coating on metal

Details Process for forming a silicate coating on metal Process for forming a silicate coating on metal

1976-12-17

1978-04-04

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 58, C25D 1102, C25D 1106, C25D 1134

Patent

active

040826260

ABSTRACT:
A relatively low voltage process for electrolytically coating a rectifier metal with a hard, glassy, corrosion-resistant silicate coating. The rectifier metal is immersed in an aqueous solution of pure potassium silicate (or a mixture of potassium silicate and a peroxide, e.g., sodium peroxide) and a voltage potential is applied between said metal and a cathode which is also immersed in said solution until a visible spark is discharged at the surface of the rectifier metal. The voltage potential is then increased to about 300 volts and maintained at that level until the desired thickness of the coating is deposited.

REFERENCES:
patent: 3832293 (1974-08-01), Hradcovsky et al.
patent: 3956080 (1976-05-01), Hradcovsky et al.

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