Electrical Steel ›› 2023, Vol. 5 ›› Issue (5): 1-.

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Effect of partial substitution of chromic anhydride with ammonium molybdate on the insulating coating of grain-oriented silicon steel

LI Yuehua 1,2, LIU Dongxu 1,2, DAI Lei 1,2, TENG Renhao 3, WANG Xianhui 3, WANG Ling 1,2   

  1. 1. College of Chemical Engineering, North China University of Science and Technology,Tangshan 063210, China; 
    2. Hebei Key Laboratory of Environmental Photocatalytic Materials, Tangshan 063210, China; 
    3. Shougang Zhixin Qian'an Electromagnetic Material Co., Ltd., Qian'an 064400, China
  • Online:2023-10-28 Published:2023-10-25

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Abstract: Insulating coatings for environment-friendly, low-chromium grain-oriented silicon steel were prepared by wire rod roller coating technology and heat treatment process, using ammonium molybdate to replace chromic anhydride. The effects of different amounts of ammonium molybdate and ammonium chromate on the stability of the insulating coating solution and the microstructure, adhesion, hardness, and corrosion resistance of the insulating coating for grain-oriented silicon steel were studied. The results showed that the replacement of chromic anhydride with ammonium molybdate can improve the wettability of the coating solution and improve the moisture resistance and corrosion resistance of the insulating coating for the grain-oriented silicon steel. When the amount of ammonium molybdate was 1.5 % and chromic anhydride was 1.5 %, the wettability of the coating solution and the wetting resistance of the coating powder were both the best, causing the best surface quality, adhesion, and corrosion resistance of the coating.

Key words: grain-oriented silicon steel, insulation coating, ammonium molybdate, environmental protection, corrosion resistant