| 摘要 |
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 P2O5, from 10 to 35 parts by weight of Ca2+ ions, calculated as CaO, from 70 to 200 parts by dry weight of colloidal SiO2, and from 40 to 200 parts by weight of water for every 100 parts of P2O5. The solution may also contain up to 20 parts by weight of Mg2+ calculated as MgO, up to 30 parts by weight of Cr6+ calculated as CrO3, and/or up to 30 extra parts by weight of phosphoric acid calculated as P2O5. The density of the solution is from 1.25 to 1.35 g/cc, and the value of the molar ratio R=(CaO+MgO)/(P2O5+CrO3) is from 0.7 to 0.9.
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