Method of providing an anti-stick coating on non-oriented, semi-

Details Method of providing an anti-stick coating on non-oriented, semi- Method of providing an anti-stick coating on non-oriented, semi-

1981-04-06

1983-01-04

O'Keefe, Veronica

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 615R, 148 615Z, 148 616, 148122, 148121, 1062865, C23F 710

Patent

active

043671012

ABSTRACT:
A process of providing an inorganic anti-stick coating directly on non-oriented, semi-processed electrical steels by applying to such steels a coating solution containing Al.sup.+++, Mg.sup.++, and H.sub.2 PO.sub.4.sup.- in a specified relative relationship, the concentration of Al.sup.+++, Mg.sup.++, and H.sub.2 PO.sub.4.sup.- comprising 100 parts by weight calculated as Al.sub.2 O.sub.3, MgO and H.sub.3 PO.sub.4, respectively, on a water-free basis. The coating solution may additionally contain from 0 to 150 parts by weight of colloidal silica on a water-free basis. Chromic anhydride (C.sub.r O.sub.3) may be added to the coating solution to improve its wettability and improve the moisture resistance of the anti-stick coating. The coating solution is so diluted with water as to provide a uniform coating as thin as possible to prevent lamination sticking and having a coating weight of less than 2 grams per square meter on each side. The coated electrical steel is subjected to a heat treatment to cure the anti-stick coating thereon.

REFERENCES:
patent: 3138492 (1964-06-01), Perry et al.
patent: 3421949 (1969-01-01), Halversen
patent: 3528863 (1970-09-01), Foster et al.
patent: 3720549 (1973-03-01), Hirst et al.
patent: 3867211 (1975-02-01), Easton
patent: 3948786 (1976-04-01), Evans
patent: 3996073 (1976-12-01), Evans
patent: 4190468 (1980-02-01), Kitayama et al.

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