Method of treating an object of silicon steel provided with an i

Details Method of treating an object of silicon steel provided with an i Method of treating an object of silicon steel provided with an i

1974-10-25

1976-01-06

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 616, 148113, C23F 710

Patent

active

039308979

ABSTRACT:
An object of silicon steel, such as sheet and strip for motors, generators and transformers, which has an insulating coating of silicate, is provided with a solution of phosphate by applying to the silicate-coated object an aqueous solution containing phosphate ions and complex metal-ammonia ions and heating the coated object to a temperature of at least about 550.degree.C for a time sufficient to anchor the resulting phosphate layer to the silicate coating. The solution has a pH-value of at least 9, and consists essentially of monophosphate ions. The metal ions are cupric ions and/or chromic ions. An insoluble filler may be added to the aqueous solution.

REFERENCES:
patent: 2753282 (1956-07-01), Perry
patent: 2835618 (1958-05-01), Keller et al.
patent: 3615918 (1971-10-01), Evans et al.
patent: 3658587 (1972-04-01), Miller

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