Chromium-free insulated coating solution, preparation method thereof and oriented silicon steel plate

Abstract

The invention provides a chromium-free insulated coating solution, a preparation method thereof and an oriented silicon steel plate. The chromium-free insulated coating solution comprises the following components of, by weight, 150-200 parts of a phosphate solution, 8-15 parts of citric acid, 2-8 parts of magnesium hydrate, 7-10 parts of boric acid, 160-250 parts of silica sol, 1-10 parts of tartaric acid, 1-10 parts of antimony trifluoride, 1-10 parts of phosphotungstic acid and 100-300 parts of water. The preparation method of the chromium-free insulated coating solution comprises the stepsthat the phosphate solution, the boric acid and the water are added and stirred; the antimony trifluoride, the citric acid and the tartaric acid are added in sequence and stirred; the magnesium hydrate and the phosphotungstic acid are added, and the pH value is made to be 1-5; and the silica sol is added and stirred, and the chromium-free insulated coating solution is obtained. A chromium-free insulated coating layer is quite high in resistance between layers and surface hardness and moreover has the excellent corrosion resistance and very high surface tension, and the outstanding magnetic performance improving effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of silicon steel, and in particular relates to a chromium-free insulating coating liquid, 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 the ...

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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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