MAGNETIC STEEL SHEET WITH SEMI-ORGANIC INSULATING COATING

摘要

Provided is an electromagnetic steel sheet with a semi-organic insulating coating film in which a semi-organic insulating coating film formed from inorganic components and an organic resin comprises, as the inorganic components, a Zr compound and an Si compound, which contains plate-like silica, at a percentage in the dry coating film of 20 to 70 mass% of the Zr compound (in terms of ZrO2) and 10 to 50 mass% of the Si compound (in terms of SiO2), with the balance being substantially the organic resin. As a result, the electromagnetic steel sheet with a semi-organic insulating coating film has excellent powdering resistance, scratch resistance, stickability, Tig weldability, punchability, and coating film appearance while no deterioration of corrosion resistance or water resistance is shown in spite of being chromium compound-free.