Iron core exhibiting excellent insulating property at end face, and method for coating end face of iron core

摘要: An iron core having an insulating coating film on the end face thereof which comprises a dried of pure silicon polymer, modified polymer and/or mixed polymers being defined in specification, has average thickness 0.5 μm or more, and exhibits withstand voltage 30 V more heat resistance temperature air 400˚C higher; method for producing core, forming then subjecting to immersion spraying treatment using one polymer. The is greatly excellent characteristics, corrosion resistance, adhesion base iron, effect improve magnetic like, allows practice with no pre-treatment such as degreasing, annealing like at low short time.