Chrome-free insulating coating composition and preparation method and oriented silicon steel plate

Abstract

The invention provides a chrome-free insulating coating composition and a preparation method and an oriented silicon steel plate. The coating composition comprises the following components of, by weight, 100 parts of phosphate solutions, 1-5 parts of molybdate, 50-150 parts of silica sols, 3-13 parts of selenium dioxide, 1-10 parts of metallic oxide and/or metal hydroxide, 5-15 parts of organic acid, 1-6 parts of boric acid and 100-300 parts of water. The preparation method of the composition comprises the steps that the phosphate solutions, the boric acid and the water are added; the selenium dioxide and the organic acid are sequentially added; and the metallic oxide and/or metal hydroxide and the molybdate are added, then the silica sols are added, and the composition is obtained. The oriented silicon steel plate comprises a pedestal and a chrome-free insulating coating formed on the surface of the pedestal, and the chrome-free insulating coating is obtained by coating the chrome-free insulating coating composition on the surface of the pedestal. The chrome-free insulating coating has extremely high interlayer resistance, surface hardness and surface tension and shows the excellent magnetic property improved effect.

Description

technical field [0001] The invention belongs to the technical field of silicon steel, and in particular relates to a chromium-free insulating coating composition, a preparation method thereof, and an oriented silicon steel plate. Background technique [0002] As an important magnetic material, grain-oriented silicon steel has excellent properties of high magnetic induction and low iron loss, and is often widely used as the core material of power transformers. The insulating coating coated on the surface of oriented silicon steel not only has the functions of anti-rust, corrosion resistance and insulation, but also the tension generated on the surface can also reduce iron loss, reduce the magnetostriction coefficient, and reduce the energy consumption and noise of the transformer. Therefore, the insulating coating is an important part of grain-oriented silicon steel. [0003] However, the vast majority of insulating coating solutions currently in use contain chromate. After...

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Problems solved by technology

However, no matter which of the above technologies is used, the overall performance of the coating cannot be achieved to achieve the performance equivalent to that of chromium-containing coatings.

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