Corrosion resistant electrical steel sheets with excellent corrosion resistance and iron cores for motors or transformers with excellent corrosion resistance

摘要

1. TECHNICAL FIELD OF THE INVENTION;The present invention relates to an electronic steel sheet having an electrical insulating film of phosphate-organic resin system.;2. The technical problem to be solved by the invention;It is a problem to be solved by the present invention to improve the corrosion resistance of an electrical steel sheet when using phosphate as the subject and phosphate as the subject.;3. Summary of Solution to Invention;Electron steel sheet having an electrical insulating film formed by applying a treatment liquid containing a resin fine free agent, a reducing agent, and an accelerator to the surface thereof,;(1) In undivided gravimetric measurement, the peak temperature at which the change in weight when the sample is heated to a constant elevated temperature is maximal is 400 ° C or higher.;(2) An phosphate-based solution containing phosphorus acid and a reducing agent containing metal, and having an electrical insulating film having excellent corrosion resistance.;4. Important uses of the invention;The present invention relates to an electromagnetic steel sheet having an electrical insulating film of phosphate-organic resin system, and more particularly to an electronic steel sheet having an electrical insulating film excellent in corrosion resistance.