Treating a silicon steel material having a silicate protective c

Details Treating a silicon steel material having a silicate protective c Treating a silicon steel material having a silicate protective c

1977-07-06

1978-10-17

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 617, 148113, 427104, 427344, C23F 710

Patent

active

041207025

ABSTRACT:
Silicon steel sheets which have a silicate protective coating are further protected by being first coated with an aqueous solution containing (1) phosphate ions, (2) silica grains, (3) iron and/or manganese ions, and (4) negative ions which convert to volatile products at temperatures below 400.degree. C, and then heated to temperatures of between about 400.degree. and 1100.degree. C for periods of between about 1/2 minute to 10 minutes in order to form a further protective phosphate layer.

REFERENCES:
patent: 2790739 (1957-04-01), Frederick et al.
patent: 3214302 (1965-10-01), Brodt et al.
patent: 3930897 (1976-01-01), Akerblom
patent: 3996073 (1976-12-01), Evans

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