Non-oriented electrical steel chromium-free insulating environment-friendly coating and preparation method of coat thereof

Abstract

The invention relates to a non-oriented electrical steel chromium-free insulating environment-friendly coating and a preparation method of a coat thereof, and belongs to the technical field of electrical steel coatings. The non-oriented electrical steel chromium-free insulating environment-friendly coating comprises the following compositions calculated by dry weight: 0 to 70 percent of aluminium dihydrogen phosphate, 0 to 70 percent of monopotassium phosphate, 0 to 70 percent of zinc dihydric phosphate, 0 to 70 percent of monocalcium phosphate, 0 to 70 percent of magnesium dihydrogen phosphate, 5 to 30 percent of acrylate emulsion, 1 to 20 percent of boric acid and 0.5 to 6 percent of silica sol; and the percent being weight percent. The coating is an environment-friendly coating not containing chromium; and the prepared coat has bright and even surface, good insulation property, adhesiveness and heat resistance, and also has the advantages of small moisture absorption and strong rust prevention capacity.

Description

technical field [0001] The invention belongs to the technical field of electrical steel coatings, and in particular relates to a non-oriented electrical steel chromium-free insulating environmental protection coating and a preparation method of the coating. Background technique [0002] Electrical steel sheet is an important magnetic material, and non-oriented electrical steel is widely used in the iron core of motors such as electric motors, generators, and small transformers. When manufacturing iron cores, it is necessary to continuously punch and cut electrical steel sheets into iron core-shaped blanks, and fix the edges of a certain number of stacked chips by welding. In order to reduce eddy current loss, an insulating coating is applied to the surface of the steel plate to insulate the layers from each other. [0003] Coating is the last process of electrical steel production. The type, process and quality of coating will have a significant impact on the mutual insulat...

AI Technical Summary

Problems solved by technology

This method of replacing chromate with aluminum phosphate or magnesium phosphate will cause the surface of the coating to be whitish and affect the appearance of the steel plate surface

Moreover, due to the high content of free phosphorus on the surface of the silicon steel sample after baking, the steel plate is sticky, which will cause adverse effects such as adhesion in industrial production.

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