초록 ▼

A chromium-free insulation coating composition includes 100 parts by weight of a phosphate solution, 1-5 parts by weight of molybdate, 50-150 parts by weight of silica sol, 3-13 parts by weight of selenium dioxide, 1-10 parts by weight of metal oxide and/or metal hydroxide, 5-15 parts by weight of o

A chromium-free insulation coating composition includes 100 parts by weight of a phosphate solution, 1-5 parts by weight of molybdate, 50-150 parts by weight of silica sol, 3-13 parts by weight of selenium dioxide, 1-10 parts by weight of metal oxide and/or metal hydroxide, 5-15 parts by weight of organic acid, 1-6 parts by weight of boric acid, and 100-300 parts by weight of water.

대표청구항 ▼

1. A chromium-free insulation coating composition comprising: 100 parts by weight of a phosphate solution, 1-5 parts by weight of molybdate, 50-150 parts by weight of silica sol, 3-13 parts by weight of selenium dioxide, 1-10 parts by weight of metal oxide and/or metal hydroxide, 5-15 parts by weigh

1. A chromium-free insulation coating composition comprising: 100 parts by weight of a phosphate solution, 1-5 parts by weight of molybdate, 50-150 parts by weight of silica sol, 3-13 parts by weight of selenium dioxide, 1-10 parts by weight of metal oxide and/or metal hydroxide, 5-15 parts by weight of organic acid, 1-6 parts by weight of boric acid and 100-300 parts by weight of water. 2. The chromium-free insulation coating composition according to claim 1, wherein the mass ratio of the organic acid to the selenium dioxide is 1-2:1. 3. The chromium-free insulation coating composition according to claim 1, wherein the coating composition has a solid content of 20% to 40%, a density of 1.1 g/ml to 1.3 g/ml, and a viscosity of 10 seconds to 30 seconds. 4. The chromium-free insulation coating composition according to claim 1, wherein the metals in the metal oxides and metal hydroxides are selected from the group consisting of magnesium, calcium, strontium, barium, zinc, iron, cobalt, and nickel. 5. The chromium-free insulation coating composition according to claim 1, wherein silica particles of the silica sol have a particle size of 1 to 10 nm. 6. The chromium-free insulation coating composition according to claim 1, wherein the organic acid is selected from the group consisting of acrylic acid, citric acid, salicylic acid, glutamic acid, maleic acid, benzoic acid and phenylacetic acid. 7. A method for making the chromium-free insulation coating composition according to claim 1, comprising the steps of: adding the phosphate solution and the boric acid and the water, stirring;adding the selenium dioxide and the organic acid, stirring;adding the metal oxides and/or metal hydroxides and the molybdates to bring pH to 1-5; andadding silica sol and stirring to obtain the chromium-free insulation coating composition, the coating composition has a solid content of 20% to 40%, a density of 1.1 g/ml to 1.3 g/ml, and a viscosity of 10 seconds to 30 seconds. 8. A grain oriented silicon steel sheet comprising a substrate and a chromium-free insulation coating formed on the surface of the substrate, the chromium-free insulation coating obtained by coating the chromium-free insulation coating composition according to claim 1 on the surface of the substrate. 9. The grain oriented silicon steel sheet according to claim 8, wherein the chromium-free insulation coating is obtained by steps of: applying the chromium-free insulation coating composition on the substrate surface of the grain oriented silicon steel sheet;drying the coated composition at a temperature of 350-500° C. for 30-80 seconds; andsintering the coated composition at a temperature of 800-1000° C. for 50 s-150 s, thus for the chromium-free insulation coating on the substrate surface of the grain oriented silicon steel sheet, the gain oriented silicon steel sheet has a dry film coating amount of 2.0-7.0 g/m2. 10. The grain oriented silicon steel sheet according to claim 9, wherein the grain oriented silicon steel sheet has a thickness of 1 to 5 microns.