Grain-oriented electrical steel sheet
By eliminating chromium compounds from the insulating film of directional electromagnetic steel plates, using a combination of phosphate and colloidal silica, and adjusting the structure of the insulating film using nuclear magnetic resonance, the problem of increased phosphorus leaching was solved, achieving excellent moisture resistance and stable insulation performance.
Patent Information
- Application Number
- CN202580005788.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-01-30
- Filing Date
- 2025-01-30
- Publication Date
- 2026-06-05
AI Technical Summary
In the prior art, when directional electromagnetic steel sheets are in the absence of chromate-free insulating film, the amount of phosphorus leaching increases under long-term storage and high temperature and humidity conditions, leading to adhesion between rolls and difficulty in unwinding, and failing to meet the requirements for moisture resistance and phosphorus leaching.
By eliminating chromium compounds from the insulating film, using a specific ratio of phosphate and colloidal silica, and combining nuclear magnetic resonance (31P-NMR) to adjust the structure of the insulating film, the peak area ratio of the Q0 structure is controlled, thereby optimizing the moisture resistance and phosphorus leaching of the insulating film.
It achieves low phosphorus leaching during long-term storage under high temperature and humidity conditions, excellent moisture resistance, avoids adhesion problems between rolls, and ensures the stability and performance of the insulating film.