C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/8
C21D 8/12 (2006.01) C21D 1/70 (2006.01) C23C 22/74 (2006.01) H01F 1/147 (2006.01)
Patent
CA 1201045
A METHOD OF PROVIDING AN ANTI-STICK COATING ON NON-ORIENTED, SEMI-PROCESSED ELECTRICAL STEELS TO BE SUBJECTED TO A QUALITY ANNEAL ABSTRACT OF THE DISCLOSURE 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 A1+++, Mg++, and H2PO4- in a specified relative relationship, the concentration of AL+++, Mg++ and H2PO4- comprising 100 parts by weight calculated as Al2O3, MgO and H3PO4, 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 (CrO3) 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 gramns per square meter on each side. The coated electrical steel is subjected to a heat treatment to cure the anti-stick coating thereon.
398063
Evans James D.
Haselkorn Michael H.
Armco Inc.
Smart & Biggar
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