Application of Silica Sol in Silicon Steel Coatings
Release date:
2025-07-22
Grain-oriented silicon steel is an important soft magnetic material widely used in the power and electronics industries. It boasts excellent properties, including high magnetic flux density and low iron loss, and is primarily employed as the core material for transformers and other electrical machinery. In the manufacturing process, the surface of grain-oriented silicon steel must undergo an insulating coating treatment. This insulating coating protects the silicon steel sheets from corrosion and rust during storage, transportation, and use, increases the surface resistivity, and reduces eddy-current losses in the grain-oriented silicon steel.
Grain-oriented silicon steel is an important soft magnetic material widely used in the power and electronics industries. It boasts excellent properties, including high magnetic flux density and low iron loss, and is primarily employed as the core material for transformers and other electrical machinery. In the manufacturing process, the surface of grain-oriented silicon steel requires an insulating coating. Such an insulating coating protects the silicon steel sheets from corrosion and rust during storage, transportation, and use, increases the surface resistivity, and reduces eddy-current losses in the grain-oriented silicon steel. Traditional silicon steel coatings suffer from issues such as easy decomposition at high temperatures, emission of harmful volatile gases, thermal instability at elevated temperatures, and tendency to absorb moisture and become sticky. Silica sol, on the other hand, exhibits high insulation performance and excellent adhesion, making it suitable as an additive for both external coatings on transformer silicon steel sheets and for sealed insulating materials. The silica surface in silica sol contains numerous active groups, such as water molecules and hydroxyl groups, which can crosslink with phosphates via these active hydroxyl groups, thereby promoting the formation of a network structure in the coating. As a result, silica sol effectively enhances the adhesion and wear resistance of high-tensile coatings used on grain-oriented silicon steel. By applying a chromic or phosphoric acid-based treatment agent containing silica sol onto the surface of steel plates, the silica sol can form a ceramic electrical insulation film at high temperatures, significantly improving the steel plate's corrosion resistance, bendability, and sliding performance. Furthermore, adding silica sol to the chromic acid solution used for rust prevention on galvanized steel surfaces can produce a more uniform surface film and create a robust, corrosion-resistant surface coating.
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