C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/28 (2006.01) B05D 5/12 (2006.01) C23C 22/74 (2006.01) H01B 3/30 (2006.01) H01F 1/18 (2006.01)
Patent
CA 2129456
An electromagnetic steel sheet has an electrically insulating coating with superior weldability, formed by coating a treatment solution on the electromagnetic steel sheet and baking the same, the treatment solution containing a synthetic resin fine-particle emulsion having resistance against chromic and/or bichromic acid and exhibiting a peak temperature not lower than 400 °C at which a weight change rate is maximized when a sample is heated at a constant rate in differential thermal gravimetry, a chromate and/or bichromate base aqueous solution containing at least one kind of two-valence metal, and an organic reducer. The steel sheet is superior in electrical insulation, adhesion, punching ability, weldability and corrosion resistance.
Kobayashi Hideo
Komori Yuka
Kosuge Norio
Mohri Taizo
Yokoyama Yasuo
Jfe Steel Corporation
Kawasaki Steel Corporation
Smart & Biggar
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