| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electromagnetic steel sheet which is superior in corrosion resistance against salt spray and has an insulation film formed from a chromate thereon. <P>SOLUTION: This electromagnetic steel sheet is manufactured by applying a coating liquid containing, for instance, magnesium chromate onto the surface of an electromagnetic steel sheet, baking it, and dipping the steel sheet in a treatment liquid containing phosphoric acid. The electromagnetic steel sheet having thus formed insulation film thereon is superior in stampability, and besides, has improved corrosion resistance against salt spray. At this time, the insulation film contains Cr and P which have a mole ratio of P/Cr=0.010 to 0.50. <P>COPYRIGHT: (C)2008,JPO&INPIT |
