Insulating coating liquid for oriented silicon steel of anti-adhesion sheets and coating process thereof

Abstract

The invention provides an insulating coating liquid for oriented silicon steel of anti-adhesion sheets and a coating process thereof. The coating liquid comprises 100 weight parts of dihydric phosphate, 1.4 to 4 weight parts of soluble molybdate and / or tungstate, 15 to 30 weight parts of chromic anhydride (CrO3), and 50 to 120 weight parts of silica sol or alumina sol. The coating liquid can be used for oriented silicon steel coatings, particularly insulating coatings on magnesium silicate ceramic layers. The insulating coatings can apply proper tension to oriented silicon steel plates, provide insulativity, reduce the adhesion phenomenon under the condition of annealing at the temperature of between 600 and 950 DEG C for 1 to 3 hours, simultaneously maintain the cluster, smoothness and stability of the insulating coatings, and particularly effectively avoid the poor machining of the oriented silicon steel caused by adhesion of the insulating coatings in the iron core winding processing technology.

Description

Insulating coating liquid for oriented silicon steel with anti-sticking sheet and coating process thereof technical field The present invention relates to a coating solution, in particular to an insulating coating solution for oriented silicon steel. Background technique The surface of oriented silicon steel generally has two layers of magnesium silicate coating and insulating coating. The coating process of the insulating coating is briefly described as follows: the oriented silicon steel plate containing the magnesium silicate coating undergoes residual MgO brushing, light acid Washing, insulating coating coating, baking and sintering and other processes are used to form oriented silicon steel products with insulating coating. The insulating coating has a small thermal expansion coefficient, which can provide a certain tension to the silicon steel plate, and at the same time has excellent insulation, corrosion resistance and other properties. In 1950, Armco Steel Compa...

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Problems solved by technology

However, the introduction of SiO2, Al2O3 or TiO2 particles will cause the surface of the insulating coating to be rough and the gloss will decrease, and will accelerate the gel reaction of colloidal SiO2, reducing the stability of the insulating coating solution. Precipitation, easy to block pipes and other problems, bring inconvenience to practical application

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