Insulative coatings for electrical steels

Details Insulative coatings for electrical steels Insulative coatings for electrical steels

1974-03-25

1976-02-24

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148113, 148 27, 148 3155, C23F 710

Patent

active

039402916

ABSTRACT:
Insulative coatings for electrical steels having improved resistance to deterioration during stress relief anneals or other heat treatments carried on in reducing atmospheres. They may be produced by coating electrical steel with an aqueous solution of phosphoric acid, magnesium oxide and one or more additional mineral acids present in an amount sufficient to adjust the pH level of the solution to from about 0.5 to about 3.0. The mole ratio Mg/PO.sub.4 should be from about 0.6 to about 1.5.

REFERENCES:
patent: 2501846 (1950-03-01), Gifford
patent: 3104993 (1963-09-01), Sievert
patent: 3207636 (1965-09-01), Wada et al.
patent: 3450578 (1969-06-01), Siemund et al.
patent: 3522113 (1970-07-01), Kohler
patent: 3615918 (1971-10-01), Evans et al.

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