Non-oriented electric steel semi-organic phosphate insulating paint with good corrosion resistance

Abstract

The invention discloses a non-oriented electric steel semi-organic phosphate insulating paint with good corrosion resistance. The semi-organic phosphate insulating paint comprises the following main components: water-soluble phosphate, tungstate, organic resin, water, a titanate coupling agent, an organic solvent and the like; and contents of the components of the insulating paint (parts by weight) based on 100 parts of the water-soluble phosphate by weight are as follows: 1-15 parts of the tungstate, 20-200 parts of the organic resin, 500-2000 parts of the water, 0.1-3 parts of the titanate coupling agent, 10-50 parts of the organic solvent and 0.1-3 parts of other paint addictives. The semi-organic phosphate insulating paint contains no harmful ingredients restricted by an EU directive RoHS, which can meet the requirements for environmental protection; and compared with the common phosphate coating, the coating of the semi-organic phosphate insulating paint has better corrosion resistance, good insulating property, good adhesiveness, good blanking property, good welding property, good heat resistance and the like, which can meet the requirements of electric motor and transformermanufacturers for application to the electric steel coating.

Description

technical field [0001] The invention relates to an insulating coating for non-oriented electrical steel, in particular to an environmentally friendly semi-organophosphate insulating coating with excellent corrosion resistance for cold-rolled non-oriented electrical steel. Background technique [0002] Non-oriented electrical steel is widely used as core material for electric motors and transformers. In order to prevent the short circuit between the iron core laminations and increase the eddy current loss, it is necessary to coat the surface of the cold-rolled non-oriented electrical steel sheet with an insulating coating. When manufacturing motor and transformer iron cores, it is necessary to punch electrical steel sheets into core-shaped blanks, and to fix the edges of the laminations and adapt to the working conditions of different types of iron cores, so the non-oriented electrical steel insulation coating Not only good insulation, but also good punching, adhesion, welda...

AI Technical Summary

Problems solved by technology

[0007] Although the above-mentioned semi-organic insulating coatings for non-oriented electrical steel do not contain toxic chromates, they all use phosphate as the anti-rust treatment agent, and their corrosion resistance needs to be improved.

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