| 摘要 |
PROBLEM TO BE SOLVED: To provide a silicon steel sheet with an insulating film having excellent appearance and adhesion by perfectly preventing the elution of Fe in the steel sheet into a coated film on formation of a chromium-free insulating film which can be fired at a low temperature. SOLUTION: Prior to formation of an insulating film, phosphoric acid pickling, and drying are performed to form a phosphoric compound film on the surface of a silicon steel sheet. At this time, the drying of the phosphoric compound film is performed in the following condition, so that the phosphoric compound film is perfectly fixed to the surface of the silicon steel sheet: T≥-1.6t+116; wherein T is a drying temperature (°C), and t is a drying time (sec). COPYRIGHT: (C)2003,JPO
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