Compositions: coating or plastic – Coating or plastic compositions – Inorganic materials only containing at least one metal atom
Patent
1978-02-24
1980-07-22
Morris, Theodore
Compositions: coating or plastic
Coating or plastic compositions
Inorganic materials only containing at least one metal atom
148 615R, 148 616, C09K 300, C23F 708
Patent
active
042137926
ABSTRACT:
A coating solution for forming on electrical steel strips an electrical insulation coating for tensioning the strip, contains on a dry weight basis for every 100 parts by weight of phosphoric acid, calculated as P.sub.2 O.sub.5, from 10 to 35 parts by weight of Ca.sup.2+ ions, calculated as CaO, from 70 to 200 parts by dry weight of colloidal SiO.sub.2, and from 40 to 200 parts by weight of water for every 100 parts of P.sub.2 O.sub.5. The solution may also contain up to 20 parts by weight of Mg.sup.2+ calculated as MgO, up to 30 parts by weight of Cr.sup.6+ calculated as CrO.sub.3, and/or up to 30 extra parts by weight of phosphoric acid calculated as P.sub.2 O.sub.5. The density of the solution is from 1.25 to 1.35 g/cc, and the value of the molar ratio R=(CaO+MgO)/(P.sub.2 O.sub.5 +CrO.sub.3) is from 0.7 to 0.9.
REFERENCES:
patent: 3121038 (1964-02-01), Perotte
patent: 3214302 (1965-10-01), Brodt et al.
patent: 3248249 (1966-04-01), Collins
Chem. Abst. 63:7975d, 1965.
Marianeschi Edmondo
Marini Paolo
Centro Sperimentale Metallurgico S.p.A.
Morris Theodore
Terni-Societe per 1'Industria e l'Elettricita S.p.A.
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