| 摘要 |
PURPOSE:To impart excellent blanking property and high insulation characteristic after annealing to an electrical steel sheet by mixing inorg. particles coated with a resin at a specific ratio with an aq. soln. contg. a chromic acid, phosphoric acid, the salts thereof and org. reducing agent, coating the mixture on the electrical steel sheet and baking the coating. CONSTITUTION:A paint is prepd. by mixing the inorg. particles such as BaSO4 coated with the org. resin with the aq. soln. which contains >=1 kinds among the chromic acid, phosphoric acid, and chromate and phosphate of Ca or Mg and the org. reducing agent and added with org. emulsion at need. The above- mentioned aq. soln. A (a kg, solid content nA%) and the inorg. particles B (b kg, weight ratio of the inorg. particles nb%) are so mixed to satisfy the conditions expressed by the mixing equation. Such paint is coated on the electrical steel sheet and is baked to form the coating. The inter-layer insulation characteristic of the film is thereby improved. The electrical steel sheet formed in the above-mentioned manner has the good blanking property and maintains the good insulation characteristic even after annealing.
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