| 摘要 |
Provided are: an electromagnetic steel sheet with an insulating coating that has excellent water resistance and rust preventing properties in high temperature, humid environments, excellent adhesiveness to electromagnetic steel sheets, and excellent appearance characteristics; and an aqueous surface treatment agent used for forming said electromagnetic steel sheet. An electromagnetic steel sheet with an insulating coating that comprises an electromagnetic steel sheet, and an insulating coating disposed on the electromagnetic steel sheet and comprising a fluorine-containing polymer with units based on a fluoroolefin, and a metal salt, is characterized in that the fluorine-containing polymer satisfies conditions 1 and 2. Condition 1: When the fluorine-containing polymer is made into a sheet, the water vapor permeability per 1 µm thickness of the fluorine-containing polymer sheet is 0.01-5 g/m2∙day. Condition 2: When the fluorine-containing polymer is made into a sheet, the oxygen permeability per 1 µm thickness of the fluorine-containing polymer sheet is less than 0.2 mol/m2∙s∙Pa. |
