Grain Oriented Steel Sheet Coating Adhesion

The patent introduces rare earth elements (La, Ce, Pr, Nd, Sc, Y) as intermediary substances that mediate between the Al-based inhibitors and the forsterite coating. These rare earth elements form a buffer layer or modify the interface structure, preventing direct harmful interactions while maintaining the magnetic flux density enhancement effect of Al-based inhibitors and improving coating adhesion

The patent creates a composite inhibitor system combining Al-based inhibitors (AlN, MnS) with rare earth elements. This composite approach allows the material to simultaneously achieve high magnetic flux density (from Al-based inhibitors) and good coating adhesion (from rare earth elements that form stable compounds with forsterite)

The patent modifies the chemical composition parameters of the coating system by adding rare earth elements to the forsterite-based primary coating. This changes the physical and chemical properties of the coating, particularly its bonding characteristics, enabling it to maintain good adhesion during shearing operations while preserving the electrical insulation properties

The patent applies different compositional characteristics to different aspects of the coating: forsterite provides the base insulation and adhesion, while rare earth elements specifically enhance edge peeling resistance during shearing operations, creating localized improvement in the coating's mechanical properties