Pre-treatment liquid and method for manufacturing electromagnetic steel sheet provided with insulating film
AssigneeJfe Steel Corporation
InventorsTakashi TERASHIMA, Karin KOKUFU
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Abstract
An electrical steel sheet provided with an insulating coating is disclosed. Therefore, a pre-treatment liquid used on an electrical steel sheet having a forsterite coating on a surface thereof is provided before applying an insulating coating treatment liquid containing at least one salt selected from the group consisting of phosphate, borate, and silicate, the pre-treatment liquid. The pre-treatment liquid includes: at least one inorganic acid selected from the group consisting of hydrochloric acid, sulfuric acid, and phosphoric acid; and acetic acid, wherein a content of the acetic acid is not less than 1 mass ppm and not more than 3000 mass ppm.
Claims14
A pre-treatment liquid used on an electrical steel sheet having a forsterite coating on a surface thereof before applying an insulating coating treatment liquid containing at least one salt selected from the group consisting of phosphate, borate, and silicate, the pre-treatment liquid comprising:
- at least one inorganic acid selected from the group consisting of hydrochloric acid, sulfuric acid, and phosphoric acid;
- and
- acetic acid,
- wherein a content of the acetic acid is not less than 1 mass ppm and not more than 3000 mass ppm.
Dependencies are inferred from the claim text.